AFNS Biology Online Test Practice – 100% Success in Initial Tests!
Prepare for your AFNS initial academic test with our specially curated Biology MCQs, designed from past experiences of successful candidates. These questions mirror the actual test pattern, giving you a 100% success rate in passing the AFNS initial tests. Boost your preparation with targeted practice and master key biology concepts to secure your place in the Armed Forces Nursing Service. Start practicing now and step closer to your dream career!
Top 50 MCQs for AFNS Biology Online Test Practice (Past Papers Included)
Testes developed inside the abdomen. In which of the following structure do they lie before birth?
a) Sac
b) Scrotum
c) Pouch
d) Vesicle
Correct Answer: b) Scrotum
In the process of ovulation, which of the following structures sucks the egg released from alternate ovary, every month?
a) Oviducts
b) Uterus
c) Vagina
d) Ureter
Correct Answer: a) Oviducts
After ovulation Graafian follicle converts into:
a) Corpus callosum
b) Corpus albicans
c) Corpus luteum
d) Corpus atresia
Correct Answer: c) Corpus luteum
Fertilization of ovum takes place in rabbit, man and other placental mammals in:
a) Ovary
b) Uterus
c) Cervix
d) Fallopian tube
Correct Answer: d) Fallopian tube
Corpus luteum in mammals occurs in:
a) Brain & connects the two cerebral hemispheres
b) Ovaries & produces progesterone hormones
c) Heart & initiate arterial connection
d) Skin & acts as a pain receptor
Correct Answer: b) Ovaries & produces progesterone hormones
The Incubation period of syphilis is:
a) 1 – 2 weeks
b) 2 – 3 weeks
c) 3 – 4 weeks
d) 07 days
Correct Answer: b) 2 – 3 weeks
In breastfeeding mothers, which hormone would be at an increased level?
a) Prolactin
b) Thyroxine
c) Aldosterone
d) Insulin
Correct Answer: a) Prolactin
Which among the following is NOT the role of Sertoli cells?
a) Protects sperms
b) Provides nourishment to sperms
c) Provides liquid medium to sperms
d) Secrete testosterone
Correct Answer: d) Secrete testosterone
At the beginning of the menstrual phase the ______ are at the lowest level?
a) Follicle-stimulating hormone
b) Ovarian hormones
c) Gonadotropins
d) None of these
Correct Answer: b) Ovarian hormones
Which hormone induces labour pains?
a) Estrogen
b) Oxytocin
c) Progesterone
d) LH
Correct Answer: b) Oxytocin
Leydig cells are responsible for:
a) Testosterone production
b) FSH production
c) Sperm production
d) Testosterone inhibition
Correct Answer: a) Testosterone production
The estrogen hormone secretion during the oogenesis is stimulated by:
a) Luteinizing Hormone
b) Follicle Stimulating Hormone
c) Inhibin Hormone
d) Testosterone Hormone
Correct Answer: b) Follicle Stimulating Hormone
Which body function is controlled through positive feed-back mechanism?
a) Labor pains
b) Body temperature
c) Insulin production
d) Thyroxin release
Correct Answer: a) Labor pains
Hormone released during child birth and in nursing women is:
a) Estrogen
b) Progesterone
c) Calcitonin
d) Oxytocin
Correct Answer: d) Oxytocin
Follicle Stimulating hormones (FSH) is secreted by:
a) Ovary
b) Pituitary gland
c) Adrenal gland
d) Testes
Correct Answer: b) Pituitary gland
Which is NOT a function of testosterone?
a) Inhibition of LH
b) Sperm production
c) Inhibition of FSH
d) Limit spermatogenesis
Correct Answer: d) Limit spermatogenesis
In human males, Inhibin hormone is produced by:
a) Leydig cells
b) Hensen’s node cells
c) Sertoli cells
d) Interstitial cells
Correct Answer: c) Sertoli cells
Which function is NOT directly performed by ovaries?
a) Progesterone production
b) Estrogen production
c) Ovulation
d) HCG production
Correct Answer: d) HCG production
During menstrual cycle, after the female gamete is released from the ovary at ovulation, the remains of the follicle (Corpus Luteum) secretes:
a) Progesterone
b) FSH
c) LH
d) Testosterone
Correct Answer: a) Progesterone
The total number of genes in a population is called:
a) Gene pool
b) Genome
c) Allele pool
d) Genomic library
Correct Answer: a) Gene pool
The region of the chromosome or more specifically, a length of the DNA molecule, which has a particular nucleotides sequence that codes for specific protein, is called:
a) Locus
b) Allele
c) Gene
d) Kinetochore
Correct Answer: c) Gene
Homozygous means:
a) Having two identical alleles of a gene
b) Alleles in an organism
c) Having two identical genes
d) Two different alleles of a gene
Correct Answer: a) Having two identical alleles of a gene
In genetics, the term locus refers to the ______ of the gene on the chromosome:
a) Frequency
b) Position
c) Copy
d) Inversion
Correct Answer: b) Position
When both the alleles of a gene pair are same, the organism is said to be:
a) Heterozygous
b) Homozygous
c) Genotype
d) Phenotype
Correct Answer: b) Homozygous
DNA stores biological information in discrete units termed as:
a) Genes
b) Phenotypes
c) Karyotypes
d) Cells
Correct Answer: a) Genes
These are the genes which tend to be inherited together and do not assort independently:
a) Linked genes
b) Dependent genes
c) Recombinant genes
d) Independent genes
Correct Answer: a) Linked genes
When two or more genes interact in a way that their effect is additive expression, it is:
a) Co-dominance relation
b) Epistasis
c) Promotive dominance
d) Polygenic inheritance
Correct Answer: d) Polygenic inheritance
Mendel concluded that each organism has two hereditary factors for each trait, now called:
a) Chromatids
b) Alleles
c) Chromosomes
d) None of the above
Correct Answer: b) Alleles
How many pairs of homologous chromosomes are present in Pisum sativum?
a) Seven pairs
b) Eight pairs
c) Nine pairs
d) Ten pairs
Correct Answer: a) Seven pairs
Mendel’s selected following pair(s) of contrasting character:
a) One/single pair
b) Seven pairs
c) Three pairs
d) Four pairs
Correct Answer: b) Seven pairs
In 1935, W.M. Stanley prepared an extract of:
a) Tobacco mosaic virus (TMV)
b) Human immunodeficiency virus (HIV)
c) Flu virus
d) Polio virus
Correct Answer: a) Tobacco mosaic virus (TMV)
Virus is a Latin word meaning:
a) Sweet
b) Sour
c) Poison
d) Acidic
Correct Answer: c) Poison
Cilia and flagella are absent in:
a) Viruses
b) Lower plants
c) Bacteria
d) Lower animals
Correct Answer: a) Viruses
Virus can only survive and reproduce inside a:
a) Animal cells
b) Bacterial cells
c) Living cells
d) Non-living cells
Correct Answer: c) Living cells
Which one can be considered as a living characteristic of a virus?
a) Can be crystallized
b) No cellular respiration
c) Mutate their genetic material
d) Lack biosynthetic machinery
Correct Answer: c) Mutate their genetic material
Which one of the following is not a characteristic of viruses?
a) They don’t respire
b) They don’t excrete
c) They don’t have the ability to reproduce
d) They can be crystallized
Correct Answer: c) They don’t have the ability to reproduce
HIV is classified as:
a) Bacteriophage
b) Retrovirus
c) Oncovirus
d) Icosahedral virus
Correct Answer: b) Retrovirus
The genome of the influenza virus is made up of:
a) Single-stranded RNA
b) Double-stranded DNA
c) Single-stranded DNA
d) Double-stranded RNA
Correct Answer: a) Single-stranded RNA
Which of the following viruses contains single-stranded DNA?
a) Adenovirus
b) Herpes virus
c) Parvovirus
d) Pox virus
Correct Answer: c) Parvovirus
In viruses, the combined structure formed by the core (nucleic acid) and capsid is called:
a) Nucleocapsid
b) Capsomeres
c) Envelope
d) Prions
Correct Answer: a) Nucleocapsid
Which of the following is not related to enveloped viruses?
a) They survive for a short time
b) They are tolerant to antibodies
c) Their envelope is sensitive to sunlight
d) Envelope is derived from the host
Correct Answer: b) They are tolerant to antibodies
Tadpole-shaped viruses are an example of:
a) Spherical viruses
b) Tadpole-shaped viruses
c) Rod-shaped viruses
d) Helical-shaped viruses
Correct Answer: b) Tadpole-shaped viruses
Which of the following is a DNA virus?
a) Polio virus
b) Influenza virus
c) Herpes virus
d) Mumps virus
Correct Answer: c) Herpes virus
Which are called naked viruses?
a) Non-enveloped viruses
b) Enveloped viruses
c) Prions
d) Viroids
Correct Answer: a) Non-enveloped viruses
The bacteriophage replicates only inside the:
a) Animal cell
b) Bacterial cell
c) Fungal cell
d) Both a & b
Correct Answer: b) Bacterial cell
What does the term bacteriophage refer to?
a) A virus that infects bacteria
b) A bacterium that infects viruses
c) A virus that behaves as bacteria
d) A combination of bacterium and virion
Correct Answer: a) A virus that infects bacteria
Polio vaccine is given by:
a) Spray
b) Tablets
c) Oral drops
d) Local application
Correct Answer: c) Oral drops
Which of the following is the simplest form of pathogen causing disease?
a) Viruses
b) Prions
c) Fungus
d) Amoeba
Correct Answer: b) Prions
Which is not a viral disease?
a) AIDS
b) Malaria
c) Chicken pox
d) Influenza
Correct Answer: b) Malaria
The word hepatitis means inflammation of the:
a) Pancreas
b) Liver
c) Spleen
d) Gall bladder
Correct Answer: b) Liver
Which one of the following pairs of diseases is caused by a virus?
a) Syphilis and TB
b) AIDS and Typhoid
c) Measles and Mumps
d) Tetanus and Cholera
Correct Answer: c) Measles and Mumps
Hepatitis is caused by:
a) Protozoans
b) Algae
c) Bacteria
d) Virus
Correct Answer: d) Virus
Rabies is caused by:
a) Paramyxovirus
b) Rhinovirus
c) Arbovirus
d) Rhabdovirus
Correct Answer: d) Rhabdovirus
Which of the following cells does HIV mainly infect?
a) T-killer lymphocytes
b) B-plasma cells
c) T-helper lymphocytes
d) B-memory cells
Correct Answer: c) T-helper lymphocytes
AIDS is caused by:
a) Bacteria
b) Fungi
c) Virus
d) Alga
Correct Answer: c) Virus
How to Ace AFNS Biology Online Test Practice – Expert Tips & Tricks
Which one is not an opportunistic disease related to HIV infection?
a) Destruction of body immune system
b) Recurrent pneumonia
c) Pulmonary tuberculosis
d) Common cold
Correct Answer: d) Common cold
The main target of HIV in AIDS is:
a) Liver cells
b) B-lymphocytes
c) Red blood cells
d) Helper T-lymphocytes
Correct Answer: d) Helper T-lymphocytes
Numerous opportunistic diseases might attack a person suffering from which of the following diseases?
a) Measles
b) Hepatitis A
c) Influenza
d) AIDS
Correct Answer: d) AIDS
Which of the following is not true about human immunodeficiency virus?
a) It is a retrovirus
b) It is surrounded by an envelope
c) It does not cause AIDS
d) It causes deficiency of the human immune system
Correct Answer: c) It does not cause AIDS
The enzymes integrase, protease, and reverse transcriptase are found in which of the following diseases?
a) Hepatitis ‘A’ virus
b) Herpes virus
c) Influenza virus
d) Human immunodeficiency virus
Correct Answer: d) Human immunodeficiency virus
Human immunodeficiency virus (HIV) particles are surrounded with a coat known as the virus envelope or membrane, made up of:
a) Glycoprotein
b) Glycolipid
c) Lipoprotein
d) Sulpholipid
Correct Answer: c) Lipoprotein
Which of the following is transmitted through infected blood and infected syringes?
a) HIV
b) Influenza virus
c) Morbilli virus (Measles)
d) Vibrio cholerae
Correct Answer: a) HIV
In AIDS, ‘D’ stands for:
a) Decompose
b) Difficult
c) Deficiency
d) Disorder
Correct Answer: c) Deficiency
Which of the following viruses contains single-stranded DNA?
a) Adeno virus
b) Herpes virus
c) Parvo virus
d) Pox virus
Correct Answer: c) Parvo virus
Virus is what type of agent?
a) Cellular agent
b) Infectious agent
c) Non-infectious agent
d) Non-protein agent
Correct Answer: b) Infectious agent
The molecules used to control viruses during infection of animal cells are:
a) Interferons
b) Histones
c) Antigens
d) Serum
Correct Answer: a) Interferons
The proteins of HIV are structurally and chemically made up of?
a) SSRNA
b) SSDNA
c) DSRNA
d) DSDNA
Correct Answer: a) SSRNA
Which of the following best characterizes viruses with un-enveloped plus-strand RNA?
a) Lacking envelope
b) Having DNA
c) Act indirectly
d) Enveloped
Correct Answer: a) Lacking envelope
Through which of the following does rabies spread?
a) Cat
b) Fox
c) Dog
d) Pig
Correct Answer: c) Dog
The hepatitis which passes from mother to her child during pregnancy is:
a) Hepatitis A
b) Hepatitis B
c) Hepatitis C
d) Hepatitis D
Correct Answer: b) Hepatitis B
A virus enters into the body of a host and intends to produce DNA from RNA. Which enzyme is required for this process?
a) Transcriptase
b) Oxido reductase
c) Reverse transcriptase
d) Ligases
Correct Answer: c) Reverse transcriptase
Which of the following is a rod-shaped virus?
a) Bacteriophage
b) Herpes virus
c) Hepatitis virus
d) Tobacco mosaic virus
Correct Answer: d) Tobacco mosaic virus
The genome of the Human Immunodeficiency Virus (HIV) is made up of?
a) cDNA
b) DNA
c) RNA
d) tRNA
Correct Answer: c) RNA
Viruses are NOT classified based on?
a) Morphology
b) Host specificity
c) Cell membrane
d) Envelope
Correct Answer: c) Cell membrane
The protein coat surrounding the genome of a virus is called?
a) Capsid
b) DNA sheath
c) Phage
d) Viroid
Correct Answer: a) Capsid
Which of the following can be effective in preventing viral infection in humans?
a) Taking antihistamines
b) Applying antiseptics
c) Getting vaccinated
d) Taking antibiotics
Correct Answer: c) Getting vaccinated
The complete, mature, and infectious virus particle is known as:
a) Venom
b) Genome
c) Virion
d) Capsid
Correct Answer: c) Virion
All viruses are:
a) Autotrophs
b) Heterotrophs
c) Parasites
d) Predators
Correct Answer: c) Parasites
Which may NOT be a possible action of interferons?
a) Belongs to cytokines
b) Activates immune cells
c) Activates natural killer cells
d) Secretes interleukin
Correct Answer: d) Secretes interleukin
Which of the following is ‘NOT RELATED’ to enveloped viruses?
a) They survive for a short time
b) Their envelope is sensitive to sunlight
c) They are tolerant to antibodies
d) Envelope is derived from the host
Correct Answer: c) They are tolerant to antibodies
Choose the organism which requires a single cellular gene to encode the protein making up the organism:
a) Viroid
b) Prion
c) Virus
d) Virion
Correct Answer: b) Prion
______ is transmitted through infected blood and hypodermic syringes:
a) HIV
b) Morbilli virus (Measles)
c) Influenza virus
d) Vibrio cholerae
Correct Answer: a) HIV
______ infection is caused by a viroid:
a) Hepatitis A
b) Mad Cow disease
c) Hepatitis D
d) Mysterious brain infection
Correct Answer: c) Hepatitis D
Presence of remnant of pelvic girdle in whale and snake although they never have legs show evidence from:
a) Biochemical evidence
b) Paleontology
c) Vestigial organs
d) Embryology
Correct Answer: c) Vestigial organs
Artificial selection in breeding provides evidence for evolution is known as:
a) Domestication
b) Deme
c) Gene pool
d) Desired trait
Correct Answer: a) Domestication
The organs perform same functions in different groups of organisms but are different in their internal structure called as:
a) Homologous organs
b) Analogous organs
c) Radial symmetry
d) Asymmetry
Correct Answer: b) Analogous organs
Which of the following is not an example of disuse of organs?
a) Snake’s leg
b) Shedding of teeth
c) Muscle atrophy
d) Movement of ear
Correct Answer: d) Movement of ear
According to evolutionary studies, prokaryotes may have arisen around:
a) 2.5 billion years ago
b) 3.5 billion years ago
c) 4.5 billion years ago
d) 5.5 billion years ago
Correct Answer: b) 3.5 billion years ago
Free AFNS Biology Online Test Practice – Prepare Like a Topper!
Which of the following type of organs are supposed to be functional in ancestral species rather than in present day species:
a) Vestigial organs
b) Homologous organs
c) Analogous organs
d) Embryonic organs
Correct Answer: a) Vestigial organs
Which of the following is the main point of Darwinism?
a) Over production
b) Variation
c) Disuse of organ
d) Perceived unity of life
Correct Answer: a) Over production
The artificial selection in breeding provides a strong evidence for evolution. What does this term means?
a) Vestigial organs
b) Domestication
c) Mutation
d) Homology
Correct Answer: b) Domestication
Carolus Linnaeus was the believer of:
a) Catastrophism
b) Natural selection
c) Inheritance of acquired characters
d) Special creation
Correct Answer: d) Special creation
Who proposed the concept that an organism can pass on acquired modifications to its offsprings?
a) Lamarck
b) Darwin
c) Malthus
d) Aristotle
Correct Answer: a) Lamarck
According to Neo-Darwinism, which of the following is a cause of evolution?
a) Reproductive isolation
b) Infinite large population
c) Environmental Stability
d) Both a and b
Correct Answer: a) Reproductive isolation
Darwin’s Origin of species by natural selection is mainly concerned with?
a) Origin of life
b) Adaption
c) Extinction
d) Speciation
Correct Answer: d) Speciation
This theory says that “mitochondria and chloroplasts are, in effect, ancient bacteria which now live inside the larger cells”?
a) Darwin’s theory of evolution
b) Lamarckism
c) Neo-Darwinism
d) Endosymbiotic theory
Correct Answer: d) Endosymbiotic theory
The organs which are similar in function but differ in structure are called ______.
a) Analogous organs
b) Homologous organs
c) Convergent organs
d) Divergent organs
Correct Answer: a) Analogous organs
Which statement is not correct for the Darwin’s theory of natural selection?
a) Survival in the struggle for existence is random
b) The fit individuals leave more off springs into their environment
c) The unequal ability of individuals to survive and reproduce will lead to a change in population characteristics
d) Accumulation over the generations thus leading to the evolution of a new species
Correct Answer: a) Survival in the struggle for existence is random
A general formula is derived by one of the following scientist for calculating the frequencies of alleles and genotypes in population at equilibrium:
a) Linnaeus
b) Lamarck
c) Darwin
d) Hardy Weinberg
Correct Answer: d) Hardy Weinberg
When humans purposefully apply selection pressure to populations, the process is known as:
a) Natural selection
b) Artificial selection
c) Evolution
d) Genetic drift
Correct Answer: b) Artificial selection
The group of animals having a single celled body which performs all the vital activities of life are called:
a) Protozoa
b) Parazoa
c) Metazoa
d) Tianozoa
Correct Answer: a) Protozoa
Which one of the following is an example of a free-living carnivorous flatworm?
a) Liver fluke
b) Tapeworm
c) Dugesia
d) Schistosoma
Correct Answer: c) Dugesia
Ascaris is which one of the following?
a) Ectoparasite
b) Respiratory tract parasite
c) Intestinal parasite
d) Urinogenital tract parasite
Correct Answer: c) Intestinal parasite
Polymorphism is a feature exhibited by members of:
a) Coelenterates
b) Porifera
c) Arthropoda
d) Platyhelminthes
Correct Answer: a) Coelenterates
______ is a triploblastic organism.
a) Jelly Fish
b) Tapeworm
c) Sea Anemone
d) Corals
Correct Answer: b) Tapeworm
Name of common gut roundworm parasite of human and pigs:
a) Ascaris lumbricoides
b) Pheretima posthuma
c) Lumbricus terrestris
d) Hirudo medicinalis
Correct Answer: a) Ascaris lumbricoides
In radial symmetry, all body parts are arranged around the central axis. Radial symmetry represents ______ mode of life:
a) Sessile
b) Active
c) Streamlined
d) Parasitic
Correct Answer: a) Sessile
Pseudo-coelomates have a body cavity but it is not true coelom. Which one of the following is included in the group?
a) Planaria
b) Earthworm
c) Tapeworm
d) Ascaris
Correct Answer: d) Ascaris
Taenia is an endoparasite of human, pig and cattle, which belongs to phylum:
a) Cnidaria
b) Annelida
c) Aschelminthes
d) Platyhelminthes
Correct Answer: d) Platyhelminthes
Following group is the example of acoelomates:
a) Platyhelminthes
b) Aschelminthes
c) Molluscs
d) Annelids
Correct Answer: a) Platyhelminthes
The larva formed during the life cycle of Annelida is:
a) Glochidium larva
b) Bipinnaria larva
c) Trochophore larva
d) Tornaria larva
Correct Answer: c) Trochophore larva
Platyhelminthes are:
a) Bilaterally symmetrical and diploblastic
b) Bilaterally symmetrical and triploblastic
c) Radially symmetrical and triploblastic
d) Radially symmetrical and diploblastic
Correct Answer: b) Bilaterally symmetrical and triploblastic
Pheretima posthuma is the scientific name of:
a) Planaria
b) Liver fluke
c) Earth worm
d) Tape worm
Correct Answer: c) Earth worm
Platyhelminthes means:
a) Flat worms
b) Round worms
c) Segmented worms
d) None
Correct Answer: a) Flat worms
Water vascular system or ambulacral system is a unique and complex system especially present in:
a) Sponges
b) Arthropods
c) Echinoderms
d) Fishes
Correct Answer: c) Echinoderms
Round worms belong to which phylum?
a) Annelida
b) Coelenterata
c) Nematoda
d) Platyhelminthes
Correct Answer: c) Nematoda
Silver fish is a/an:
a) Insect
b) Mollusc
c) Jawless fish
d) Cartilaginous fish
Correct Answer: a) Insect
Tissues are not found in the following animal:
a) Flatworms
b) Sponges
c) Cnidarians
d) Roundworm
Correct Answer: b) Sponges
The animal which is not having soft body:
a) Limax
b) Unio
c) Sepia
d) Loligo
Correct Answer: b) Unio
Animals having jointed legs and chitinous exoskeleton are known as:
a) Onorates
b) Arthropods
c) Annelids
d) Molluscs
Correct Answer: b) Arthropods
Alternation of generation is the character of ______ phylum:
a) Annelida
b) Arthropoda
c) Coelenterata
d) Echinodermata
Correct Answer: c) Coelenterata
It provides protection of coastline from storm, shelter for marine organisms, carbon and nitrogen fixing:
a) Polyps
b) Coral reefs
c) Medusa
d) Aurelia
Correct Answer: b) Coral reefs
Skeleton of marine shelled sarcodians give clues to possible deposit of:
a) Potassium
b) Magnesium
c) Chromium
d) Calcium
Correct Answer: d) Calcium
Opossum and koala bear belongs to sub-class:
a) Prototheria
b) Eutheria
c) Metatheria
d) Monotremata
Correct Answer: c) Metatheria
The table shows some characteristics of four different vertebrates. Which vertebrate is reptile?
| | Fins | Legs | Scales | Hair |
|—|—|—|—|—|
| A. | ✓ | ✓ | ✓ | ✓ |
| B. | ✓ | ✓ | ✓ | ✗ |
| C. | ✗ | ✓ | ✓ | ✗ |
| D. | ✗ | ✓ | ✗ | ✓ |
Correct Answer: C
Mammals become dominant in:
a) Cenozoic period
b) Jurassic period
c) Mesozoic period
d) Paleozoic period
Correct Answer: a) Cenozoic period
Enteron is the characteristic feature of:
a) Phylum Porifera
b) Phylum Platyhelminthes
c) Phylum Cnidaria
d) Phylum Echinodermata
Correct Answer: c) Phylum Cnidaria
The body of which is called metamerically segmented?
a) Cnidarians
b) Nematodes
c) Annelids
d) Sponges
Correct Answer: c) Annelids
Excretion in Planaria takes place by?
a) Malpighian tubules
b) Protonephridia
c) Metanephridia
d) Nephron
Correct Answer: b) Protonephridia
Four chambered heart with right systemic arch only is present in?
a) Amphibians
b) Reptiles
c) Birds
d) Mammals
Correct Answer: c) Birds
What is formed when the blastula folds inwards?
a) Morula
b) Blastocoel
c) Blastopore
d) Gastrula
Correct Answer: d) Gastrula
Which phenomenon describes the production of asexual form by sexual form and vice versa?
a) Colony
b) Parasitism
c) Alternation of generation
d) Polymorphism
Correct Answer: c) Alternation of generation
Which of the following describes coral reefs used by Hakeem in preparing eastern medicines?
a) Diamond
b) Emerald
c) Ruby
d) Marjan
Correct Answer: d) Marjan
Evolutionary progress towards formation of organ system in cnidarians includes development of enteron and:
a) Rudimentary network of nerves
b) Cnidocytes
c) Symmetry
d) Cellular organization
Correct Answer: a) Rudimentary network of nerves
Which of the following is a good evidence of an evolutionary pathway leading from reptiles to birds?
a) Mammals
b) Fishes
c) Archaeopteryx
d) Arthropods
Correct Answer: c) Archaeopteryx
The evolution of birds has long been a difficult issue for biologists until the discovery of the Archaeopteryx fossil in 1861. This ancient bird exhibited teeth, a long tail containing 20 vertebrae and wings with movable finger and claws. In the light of mentioned facts who were the ancestors of the birds?
a) Insects
b) Pisces
c) Amphibians
d) Reptiles
Correct Answer: d) Reptiles
The cells of the endoderm of Coelenterates are specialized for?
a) Excretion
b) Digestion
c) Defense
d) Respiration
Correct Answer: b) Digestion
Parazoa are simple multicellular animals which are believed to have evolved from?
a) Bacteria
b) Protists
c) Fungi
d) Plants
Correct Answer: b) Protists
Which structure is responsible for the excretion in Arthropods?
a) Nephron
b) Pronephridia
c) Metanephridia
d) Malpighian tubules
Correct Answer: d) Malpighian tubules
Alternation of generation is the character of ______ phylum?
a) Annelida
b) Arthropoda
c) Coelenterata
d) Echinodermata
Correct Answer: c) Coelenterata
AFNS Biology Online Test Practice: Solved MCQs from Previous Exams
All animals begin life as a ______
a) Multicellular fertilized egg
b) Hollow blastula
c) Single fertilized egg
d) Gastrula
Correct Answer: c) Single fertilized egg
Negative feedback mechanism is the characteristics of which class?
a) Class Fish
b) Class Amphibian
c) Class Reptilia
d) Class Mammalia
Correct Answer: d) Class Mammalia
Which of the following is true about Amoebae?
a) They have flagella
b) They are multicellular
c) They do not cause any disease in humans
d) They move by forming specialized cytoplasmic projections called pseudopodia
Correct Answer: d) They move by forming specialized cytoplasmic projections called pseudopodia
Select an anamniotes from the following:
a) Snake
b) Parrot
c) Frog
d) Crocodile
Correct Answer: c) Frog
Multicellular, heterotrophic nutrition, cell walls are never present in their cells, which kingdom do these organisms belong to?
a) Kingdom Protocista
b) Kingdom Fungi
c) Kingdom Plantae
d) Kingdom Animalia
Correct Answer: d) Kingdom Animalia
The first cells produced by the repeated cell division of germinal epithelium of testis are:
a) Interstitial cells
b) Secondary spermatocytes
c) Spermatogonia
d) Spermatids
Correct Answer: c) Spermatogonia
A type of cell in human testes which produces testosterone is called:
a) Interstitial cells
b) Sertoli cells
c) Germ cells
d) Spermatocytes
Correct Answer: a) Interstitial cells
Which one of the following differentiates directly into mature sperm?
a) Primary spermatocyte
b) Spermatogonia
c) Secondary spermatocyte
d) Spermatid
Correct Answer: d) Spermatid
What is the location of interstitial cells in testes?
a) Inside the seminiferous tubules
b) Among the germinal epithelial cells
c) Between the seminiferous tubules
d) Around the testes
Correct Answer: c) Between the seminiferous tubules
Spermatogonia differentiate directly into:
a) Primary spermatocytes
b) Spermatogonia
c) Secondary spermatocytes
d) Spermatids
Correct Answer: a) Primary spermatocytes
During spermatogenesis, the ______, which are haploid cells eventually mature into spermatozoa/mature sperms?
a) Secondary spermatocytes
b) Spermatogonia
c) Primary spermatocytes
d) Spermatids
Correct Answer: d) Spermatids
Each human testis is divided into:
a) 50-100 lobules
b) 150-200 lobules
c) 200-300 lobules
d) 250-300 lobules
Correct Answer: c) 200-300 lobules
In male reproductive system, the hormone involved in regulation of rate of spermatogenesis is called:
a) Luteinizing hormone
b) Follicle stimulating hormone
c) Testosterone
d) Inhibin
Correct Answer: d) Inhibin
The process of spermatogenesis (formation of sperm) takes place in which part of male reproductive system:
a) Urethra
b) Epididymis
c) Oviduct
d) Seminiferous tubules
Correct Answer: d) Seminiferous tubules
Which one of the following cells have haploid number of chromosomes?
a) Sperm cell
b) Mesophyll cell
c) Skin cell
d) Muscular cell
Correct Answer: a) Sperm cell
The terminal portion of the male duct system is:
a) Vasa efferenta
b) Vasa deferens
c) Urethra
d) Epididymis
Correct Answer: c) Urethra
Average sperm count per ml is:
a) 20-150 million
b) 2-10 million
c) 20-150 thousand
d) 2-10 thousand
Correct Answer: a) 20-150 million
Uterus opens to the vagina by a narrow opening bounded by muscular sphincter at its bottom known as:
a) Urinary bladder
b) Cervix
c) Oviduct
d) Labia
Correct Answer: b) Cervix
Yellowish glandular structure formed after the release of egg from follicle is called:
a) Corpus callosum
b) Corpus luteum
c) Graafian follicle
d) Follicle atresia
Correct Answer: b) Corpus luteum
On puberty, the development of primary follicles is stimulated by:
a) ICSH
b) LH
c) FSH
d) Estrogen
Correct Answer: c) FSH
In females, FSH stimulates the ovary to produce:
a) Progesterone
b) Estrogen
c) Prolactin
d) Oxytocin
Correct Answer: b) Estrogen
The oocyte released during ovulation is in:
a) Anaphase I
b) Metaphase I
c) Prophase I
d) Metaphase II
Correct Answer: d) Metaphase II
In which phase of human female menstrual cycle, endometrium prepares for the implantation of embryo?
a) Proliferative phase
b) Secretory phase
c) Menstrual phase
d) Ovulation phase
Correct Answer: b) Secretory phase
Events of menstrual cycle are regulated by the:
a) Ethylene
b) Auxins
c) Gonadotrophins
d) Gibberellins
Correct Answer: c) Gonadotrophins
Decrease of FSH and increase of estrogen cause pituitary gland to secrete:
a) Somatotrophin
b) Testosterone
c) Luteinizing hormone
d) Spermatogonium
Correct Answer: c) Luteinizing hormone
FSH stimulates the production of estrogen hormone which has two targets ______ and ______:
a) Uterus, posterior pituitary
b) Ovaries, uterus
c) Uterus, anterior pituitary
d) Ovaries, hypothalamus
Correct Answer: b) Ovaries, uterus
Which of the following hormone suppresses ovulation?
a) Progesterone
b) FSH
c) Insulin
d) Prolactin
Correct Answer: a) Progesterone
Which of the following hormone causes ovulation?
a) LH
b) Estrogen
c) Progesterone
d) FSH
Correct Answer: a) LH
Secretion of FSH is inhibited by:
a) Testosterone
b) Estrogen
c) Progesterone
d) LH
Correct Answer: b) Estrogen
Which hormone is released in female in response to FSH from pituitary gland?
a) Oxytocin
b) LH
c) ADH
d) Progesterone
Correct Answer: b) LH
Which of the following hormone acts on the uterus wall for thickening?
a) Zona pellucida
b) Progesterone
c) Oxytocin
d) Follicle stimulating hormone
Correct Answer: b) Progesterone
Which hormonal pair would maintain the endometrium and make it receptive for implantation of embryo?
a) Luteinizing Hormone and Progesterone
b) Estrogen and Follicle Stimulating Hormone
c) Luteinizing Hormone and Follicle Stimulating Hormone
d) Estrogen and Progesterone
Correct Answer: d) Estrogen and Progesterone
Which of the following hormone stimulates the ovulation from the follicle into oviduct?
a) Luteinizing hormone
b) Estrogen
c) Follicle stimulating hormone
d) Progesterone
Correct Answer: a) Luteinizing hormone
On the onset of puberty in the females, the pituitary gland releases the:
a) Progesterone
b) Oxytocin
c) Luteinizing hormone
d) Follicle stimulating hormone
Correct Answer: d) Follicle stimulating hormone
Progesterone is secreted by:
a) Corpus luteum
b) Ripening follicles
c) Uterine epithelium
d) Fertilized egg
Correct Answer: a) Corpus luteum
Which one of the following represents the changes that occur in the ovary and the uterus approximately every 28 days involving ovulation with the breakdown and loss of the lining of the uterus?
a) Ovulation
b) Uterine cycle
c) Menstrual cycle
d) Embryo formation
Correct Answer: c) Menstrual cycle
Which of the following hormones of the pituitary gland regulate the menstrual cycle?
a) Follicle stimulating hormone and estrogen
b) Luteinizing hormone and estrogen
c) Follicle stimulating hormone and Luteinizing hormone
d) Estrogen and progesterone
Correct Answer: c) Follicle stimulating hormone and Luteinizing hormone
Level of luteinizing hormone (LH) is maximum in blood during which stage of menstrual cycle?
a) Menstrual stage
b) Proliferative stage
c) Ovulation stage
d) Secretory stage
Correct Answer: c) Ovulation stage
During menstrual cycle, after the female gamete is released from the ovary (ovulation), the remains of the follicle secretes:
a) Progesterone
b) FSH
c) LH
d) Testosterone
Correct Answer: a) Progesterone
Normal gestation period in human is about ______ days:
a) 300-320
b) 320-350
c) 270-280
d) 240-250
Correct Answer: c) 270-280
After fertilization, zygote takes ______ for its journey from fallopian tube to uterus:
a) 6-7 days
b) 3-6 days
c) 10-12 days
d) 12-15 days
Correct Answer: b) 3-6 days
The longest phase of the menstrual cycle is:
a) Pre-ovulatory phase
b) Secretary phase
c) Ovulatory phase
d) Menstrual phase
Correct Answer: b) Secretary phase
Corpus luteum secretes the hormones:
a) Testosterone
b) Parathormone
c) Oxytocin
d) Progesterone
Correct Answer: d) Progesterone
The vacated vesicular follicle forms a fatty yellow structure on ovary called as:
a) Graafian luteum
b) Corpus luteum
c) Ruptured ovum
d) Follicle
Correct Answer: b) Corpus luteum
Treponema pallidum is the causative organism for which disease?
a) Gonorrhea
b) Syphilis
c) AIDS
d) Diabetes
Correct Answer: b) Syphilis
The labour pains to expel fetus are due to action of oxytocin on:
a) Endometrium
b) Myometrium
c) Perimetrium
d) Ovaries
Correct Answer: b) Myometrium
Production of Follicle-stimulating hormone (FSH) and Luteinizing Hormone (LH) from the pituitary gland of female is controlled by:
a) Ovary
b) Uterus
c) Stimulated follicles
d) Hypothalamus
Correct Answer: d) Hypothalamus
The function of hyaluronidase enzyme is:
a) Penetration of the sperm into the ovum
b) Entrance of the sperm into the fallopian tube
c) Entrance of the sperm into the vagina
d) Inactivation of sperms after their failure to fertilize ovum
Correct Answer: a) Penetration of the sperm into the ovum
In human females, what is the small, pear-shaped, muscular, distensible, sac-like organ where gestation takes place?
a) Uterus
b) Kidney
c) Fallopian tube
d) Stomach
Correct Answer: a) Uterus
The term menopause means:
a) Start of menstruation
b) Stop of ova production
c) Start of ovulation
d) Degeneration of ovaries
Correct Answer: b) Stop of ova production
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