Biology MCQ (Multiple Choice Questions) - SchoolingAxis

Biology MCQ (Multiple Choice Questions)

 Que- Which statement is incorrect? 

a. Climacteric is burst of respiratory activity in fruit ripening 

b. It is associated with ethane production 

c. It helps in fruit set 

d. It helps in fruit ripening 


Answer- It helps in fruit set


Que- What is critical in photoperiodism? 

a. Length of light period 

b. Length of dark period 

c. Both a and b 

d. None of these 


Answer- Length of dark period


Que- Which one is not a day neutral plant? 

a. Cucumber 

b. Maize 

c. Cotton 

d. Tobacco 


Answer- Tobacco


Que- Which statement is incorrect? 

a. In short day plants red light prevents flowering 

b. Henbane is a short day plant 

c. In long day plants for red light promotes flowering 

d. Leaf unrolling occurs in grasses 


Answer- Henbane is a short day plant


Que- In biennials and perennials, low temperature stimulus is not received by 

a. Shoot apex of mature stem 

b. Embryo of the seed 

c. Leaves of the plants 

d. None of the above 


Answer- Leaves of the plants


Que- Development of an egg into zygote without fertilization is called 

a. Parthenogenesis 

b. Apomixes 

c. Parthenocarpy 

d. None of these 


Answer- Parthenogenesis


Que- In which organism males are haploid 

a. Aphids 

b. Honey bee 

c. Mosquito 

d. Butterfly 


Answer- Honey bee


Que- In cloning, nucleus is introduced into 

a. Somatic cell 

b. Egg cell 

c. Sperm cell 

d. None of these 


Answer- Egg cell


Que- Which characteristic is not of identical twins? 

a. Produced by separation of two blastomeres 

b. Have different genetic makeup 

c. Produced asexually 

d. Produced when embryo is at two cell stage 


Answer- Have different genetic makeup


Que- Viviparous animals are those in which 

a. Internal fertilization with external development in eggs 

b. Internal fertilization with internal development inside female body 

c. Internal fertilization and internal development followed by hatching of egg 

d. External fertilization with external development 


Answer- Internal fertilization with internal development inside female body


Que- Example of ovoviviparous 

a. Reptiles 

b. Mammals 

c. Duckbill platypus 

d. Frog 


Answer- Duckbill platypus


Que- Sertoli cells 

a. Provide liquid medium to cells in testes 

b. Provide protection and nourishment to cells 

c. Secrete testosterone 

d. Both a and b 


Answer- Both a and b


Que- 2nd meiotic division in oocyte is completed 

a. When ovum is discharged from the ovary 

b. When oocyte is fertilized by sperm 

c. Just before fertilization 

d. Before the onset of menstruation 


Answer- When oocyte is fertilized by sperm


Que- Fertilization of ovum occurs 

a. In proximal part of oviduct 

b. In distal part of oviduct 

c. In uterus 

d. In ovary 


Answer- In proximal part of oviduct


Que- Duration of menstrual cycle is 

a. 25 days 

b. 26 days 

c. 27 days 

d. 28 days 


Answer- 28 days


Que- Progesterone is secreted by 

a. Ripening follicles 

b. Uterine epithelium 

c. Corpus luteum 

d. Fertilized egg 


Answer- Corpus luteum


Que- Total gestation period is about 

a. 350 days 

b. 200 days 

c. 280 days 

d. 320 days 


Answer- 280 days


Que- Fetus is human embryo from the beginning of 

a. 2nd month 

b. 3rd month 

c. 4th month 

d. 5th month 


Answer- 3rd month


Que- Average loss of blood during birth is about 

a. 250 cm3 

b. 350 cm3 

c. 450 cm3 

d. 150 cm3 


Answer- 350 cm3


Que- Which statement is incorrect? 

a. Syphilis is caused by Treponema pallidum 

b. Genital herpes produces genital soreness and ulcers 

c. Syphilis affects eyes, bones, joints, CNS 

d. Gonorrhea is caused by gram negative bacterium 


Answer- Gonorrhea is caused by gram negative bacterium


Que- The animals in which there are separate male and female individuals are called 

a. Unisexual 

b. Bisexual 

c. Hermaphrodite 

d. None of these 


Answer- Unisexual


Que- In which of the following animals, placenta is formed? 

a. Prototherians 

b. Metatherians 

c. Eutherians 

d. None of these 


Answer- Eutherians


Que- Which of these cycles operate in human females? 

a. Oestrous cycle 

b. Menstrual cycle 

c. Both of these 

d. None of these 


Answer- Menstrual cycle


Que- During birth which of following act as birth canal? 

a. Oviduct 

b. Uterine tube 

c. Uterus 

d. Vagina 


Answer- Vagina


Que- Nutrition to egg in ovary is provided by 

a. Germ cells 

b. Follicle cells 

c. Milk cells 

d. None of these 


Answer- Follicle cells


Que- End of menstrual cycle in old age is called 

a. Andropause 

b. Menopause 

c. Gametopause 

d. All of these 


Answer- Menopause


Que- In asexual reproduction offspring are genetically 

a. Identical to the parents 

b. Non identical to the parents 

c. Identical if mutations do not occur. 

d. Both a and c 


Answer- Both a and c


Que- Evolution of pollen tube is parallel to the evolution of 

a. Leaf 

b. Plant 

c. Flower 

d. Seed 


Answer- Seed


Que- Resumption of normal growth by a dormant embryo is called 

a. Seed dormancy 

b. Germination 

c. Fruit set 

d. Fruit ripening 


Answer- Germination


Que- ________ is a quiescent form of phytochrome. 

a. P630 

b. P660 

c. P730 

d. P760 


Answer- P660


Que- Apomixis is a form of 

a. Parthenocarpy 

b. Vernalization 

c. Parthenogenesis 

d. None of these 


Answer- Parthenogenesis


Que- Growth process is 

a. Irreversible 

b. Reversible 

c. Sometimes reversible sometimes irreversible 

d. Temporary 


Answer- Irreversible


Que- A plant has a growth pattern called 

a. Closed growth 

b. Open growth 

c. In between the two 

d. None of these 


Answer- Open growth


Que- Speed of growth is 

a. Rapid throughout 

b. Slow throughout 

c. First slow then rapid then slow again 

d. First rapid then slow 


Answer- First rapid then slow


Que- Meristems are group of cells that 

a. Allow the surrounding region to divide 

b. Provide nutrition 

c. Help in movement 

d. Retain the potential to divide 


Answer- Retain the potential to divide


Que- Higher plants grow through 

a. Growing points 

b. Whole plant body is capable of growing 

c. Only roots grow 

d. None of these 


Answer- Growing points


Que- Meristems are of 

a. Two types 

b. Three types 

c. Four types 

d. Five types 


Answer- Three types


Que- Apical meristems are located at 

a. Tips of leaves 

b. Tips of flowers 

c. Tips of roots and stems 

d. Tips of roots only 


Answer- Tips of roots and stems


Que- Function of intercalary meristems is 

a. Increase in length 

b. Increase in diameter 

c. Production of leaves and flowers 

d. None of these 


Answer- Production of leaves and flowers


Que- Lateral meristems are present in 

a. All plants 

b. Gymnosperms and dicots 

c. Monocots 

d. In aquatic plants only 


Answer- Gymnosperms and dicots


Que- Intercalary meristems are of 

a. Permanent nature 

b. Temporary nature 

c. Some are permanent some temporary 

d. None of these 


Answer- Temporary nature


Que- Determinate growth is 

a. Growing continuously 

b. Fluctuating growth 

c. Grow to certain size and then stop 

d. Vegetative roots and shoots grow by 


Answer- Vegetative roots and shoots grow by


Que- Vegetative roots and shoots grow by 

a. Determinate growth 

b. Primary growth only 

c. Indeterminate growth 

d. None of these 


Answer- None of these


Que- In plants growth is of 

a. Four types 

b. Five types 

c. One type 

d. Two types 


Answer- Two types


Que- Secondary growth is actually 

a. Extension of plant body 

b. Increase in thickness 

c. Production of leaves and flowers 

d. None of these 


Answer- Increase in thickness


Que- Cambium are examples of 

a. Apical meristems 

b. Intercalary meristems 

c. Lateral meristems 

d. None of these 


Answer- Lateral meristems


Que- Growth of multicellular plants occur in 

a. Two phases 

b. Three phases 

c. Five phases 

d. Four phases 


Answer- Four phases


Que- In multicellular plants cell division occur by 

a. Binary fission 

b. Conjugation 

c. Meiosis 

d. Mitosis 


Answer- Mitosis


Que- Cells elongate by 

a. Mitosis 

b. Uptake of water 

c. Stretching 

d. Formation of cell wall 


Answer- Uptake of water


Que- Plasticity of cell wall increases during 

a. Cell maturation 

b. Cell elongation 

c. Cell differentiation 

d. Cell division 


Answer- Cell elongation


Que- Cells of fibers and tracheids elongate during 

a. Phase of cell division 

b. Phase of cell elongation 

c. Phase of cell maturation 

d. Phase of cell differentiation 


Answer- Phase of cell division


Que- During cell differentiation 

a. Walls of cells become thick 

b. Walls of cells become pitted 

c. Both of these 

d. None of these 


Answer- Both of these


Que- Maximum optimum temperature for growth of plants is 

a. 30-40 degree C 

b. 25-30 degree C 

c. 10-20 degree C 

d. 20-40 degree C 


Answer- 25-30 degree C


Que- Which one is incorrect 

a. Red light favours elongation of cells 

b. Blue light retards cell enlargement 

c. UV rays retards cell elongation 

d. UV rays retard cell division 


Answer- UV rays retard cell division


Que- Light duration plays a role in inducing or suppressing flowering, phenomenon is called 

a. Photosynthesis 

b. Photoperiodism 

c. Phototropism 

d. Photogenetics 


Answer- Photoperiodism


Que- Root primordial develop from 

a. Apical meristems 

b. Intercalary meristems 

c. Pericycle 

d. Epidermis 


Answer- Pericycle


Que- Growth of apical buds suppressing lower axillary buds is 

a. Lateral dominance 

b. Compensatory dominance 

c. Apical dominance 

d. Both a and b 


Answer- Apical dominance


Que- In chicks fertilization is 

a. Internal 

b. External 

c. Both a and b 

d. None of these 


Answer- Internal


Que- Incubation temperature for chick is 

a. 20-30 degree C 

b. 40-45 degree C 

c. 36-38 degree C 

d. 25-35 degree C 


Answer- 36-38 degree C


Que- After providing 36-38 degree C temperature, chick's egg is hatched on 

a. 20th days 

b. 25th days 

c. 23rd days 

d. 21st days 


Answer- 21st days


Que- Which one is incorrect? 

a. Epiblast is presumptive ectoderm and mesoderm 

b. Hypoblast is presumptive endoderm 

c. Hypoblast is presumptive mesoderm 

d. Upper layer of cells in blastoderm is epiblast 


Answer- Hypoblast is presumptive mesoderm


Que- Peripheral part of blastoderm making contact with yolk is called 

a. Area pellucida 

b. Area opaca 

c. Blastocoel 

d. Area plana 


Answer- Area opaca


Que- Cavity formed between somatic and splanchnic mesoderm is called 

a. Gastrocoele 

b. Blastocoele 

c. Coelom 

d. Neurocoele 


Answer- Coelom


Que- Mechanism of development was explained by 

a. Hans Dietrisch 

b. Spemann 

c. Both a and b 

d. Haemmerling 


Answer- Both a and b


Que- Which statement is correct about gray crescent? 

a. A pigmented area that appears at time of fertilization 

b. A pigment free area that disappears at the time of fertilization 

c. A hyperpigmented area that is present in the embryo 

d. A pigment free area that appears at time of fertilization 


Answer- A pigment free area that appears at time of fertilization


Que- Which statement is incorrect? 

a. Fertilized egg of an ascidian contains cytoplasm of four colours 

b. Yellow cytoplasm gives rise to gut 

c. Grey equatorial cytoplasm gives rise to notochord. 

d. Grey vegetal cytoplasm gives rise to gut 


Answer- Yellow cytoplasm gives rise to gut


Que- Acetabularia crenulata has 

a. Irregular shaped cap 

b. Regular shaped cap 

c. Irregular while young and regular while adult 

d. No cap 


Answer- Irregular shaped cap


Que- Which statement is correct? 

a. Ectodermal cells have effect on mesodermal cells to induce differentiation 

b. Mesodermal cells stimulate ectodermal cells to form nervous system 

c. Endodermal cells stimulate ectodermal cells 

d. All are correct 


Answer- Mesodermal cells stimulate ectodermal cells to form nervous system


Que- Negative physiological changes in our body is called 

a. Teratology 

b. Aging 

c. Regeneration 

d. Embryonic induction 


Answer- Aging


Que- Study of aging is 

a. Teratology 

b. Embryology 

c. Gerontology 

d. Pathology 


Answer- Gerontology


Que- The ability to regain or recover the lost or injured part of body is 

a. Aging 

b. Regeneration 

c. Abnormal development 

d. Primary induction 


Answer- Regeneration


Que- Among invertebrates who possess great power of regeneration 

a. Arthropods 

b. Molluscs 

c. Sponges 

d. Nematodes 


Answer- Sponges


Que- Which statement is incorrect? 

a. Earthworm can regenerate its head 

b. Salamander can regenerate its limbs 

c. Lizard can regenerate its head 

d. Man can regenerate his skin 


Answer- Lizard can regenerate its head


Que- Growth is basically an increase in 

a. Nuber of cells 

b. Size of cells 

c. Both of these 

d. None of these 


Answer- Both of these


Que- The stage of rapid cell division just after fertilization is 

a. Organogenesis 

b. Cleavage 

c. Gastrulation 

d. Growth 


Answer- Cleavage


Que- The German scientist Spemann worked on differentiation in 

a. 1924.0 

b. 1929.0 

c. 1915.0 

d. 1940.0 


Answer- 1924.0


Que- Inducer substances are produced by 

a. Notochord 

b. Somite 

c. Archenteron 

d. Coelom 


Answer- Notochord


Que- What is the feature of cells in gastrulation? 

a. Division 

b. Migration 

c. Differentiation 

d. All of these 


Answer- Migration


Que- Vertebral column is formed from 

a. Ectoderm 

b. Endoderm 

c. Mesoderm 

d. None of these 


Answer- Mesoderm


Que- Liver and pancreas arise from 

a. Foregut 

b. Midgut 

c. Hindgut 

d. None of these 


Answer- Foregut


Que- Hemophilia is 

a. Excessive bleeding due to defective gene on sex chromosome 

b. Due to extra sex chromosome 

c. Due to structural deviation during organogenesis 

d. Due to nutritional deficiencies 


Answer- Excessive bleeding due to defective gene on sex chromosome


Que- Which is incorrect? 

a. Chromosomes 1st observed by walther Fleming 

b. Chromosomal theory of inheritance 1st formulated by Walter Sutton 

c. 1st evidence of hereditary nature of DNA provided by Friedrich Meischer 

d. Sex chromosomes discovered by Thomas Hunt Morgan 


Answer- 1st evidence of hereditary nature of DNA provided by Friedrich Meischer


Que- Chromosome is made of 

a. 2 chromatids +1 centromere +secondary constriction 

b. 1 chromated + 1 centromere + primary constriction 

c. 2 chromatids + 1 centromere + primary constriction 

d. 2 chromatids + 2 centromere + secondary constriction 


Answer- 2 chromatids +1 centromere +secondary constriction


Que- Chromosomes are composed of 

a. 40% protein and 60% DNA 

b. 50% protein and 50% DNA 

c. 70% protein and 30% DNA 

d. 60% protein and 40% DNA 


Answer- 60% protein and 40% DNA


Que- A typical human chromosome contains _________ nucleotides in its DNA 

a. 240 million 

b. 140 million 

c. 150 million 

d. 160 million 


Answer- 140 million


Que- Histones have abundance of amino acids 

a. Valine and lysine 

b. Arginine and lysine 

c. Valine and arginine 

d. Histidione and threonine 


Answer- Arginine and lysine


Que- A tortion of chromatin that is condensed only during cell division is 

a. Euchromatin 

b. Heterochromatin 

c. Biochromatin 

d. Nucleochromatin 


Answer- Euchromatin


Que- Transfer of genetic material from one cell to another that can alter the genetic makeup of recipient cell is called 

a. Mutation 

b. Transuction 

c. Replication 

d. Variation 


Answer- Transuction


Que- DNA contains 

a. Purines (A and G) pyrimidines (U and (c) 

b. Purines (T and (c) pyrimidines (A and G) 

c. Purines (A and (c) pyrimidines (U and G) 

d. Purines (A and G) pyrimidines (T and (c) 


Answer- Purines (A and G) pyrimidines (T and (c)


Que- In DNA 

a. A forms two bonds with T 

b. G forms three bonds with C 

c. A forms three bonds with T 

d. Both a and b 


Answer- Both a and b


Que- DNA has a helical shape with the diameter of 

a. 3 nm 

b. 4 nm 

c. 2 nm 

d. 5 nm 


Answer- 2 nm


Que- In semi-conservative replication 

a. Sequence of original duplex is conserved after one round of replication 

b. Gererate DNA copies of entirely new molecules 

c. Parental DNA become completely dispersed 

d. Each strand of daughter molecules will be a mixture of old and new 


Answer- Sequence of original duplex is conserved after one round of replication


Que- The true E.Coli replicating enzyme is 

a. DNA polymerase I 

b. DNA polymerase II 

c. DNA polymerase III 

d. All of these 


Answer- DNA polymerase III


Que- Rate of DNA replication by DNA polymerase is 

a. 2000 nucleotides / sec 

b. 1000 nucleotides / sec 

c. 150 nucleotides / sec 

d. 1050 nucleotides / sec 


Answer- 1000 nucleotides / sec


Que- Which statement is correct? 

a. Leading strand elongates away from the replication fork 

b. Lagging strand elongates towards the replication fork 

c. Lagging strand is constructed discontinuously. 

d. Both a and b 


Answer- Lagging strand is constructed discontinuously.


Que- The length of okazaki fragments in eukayotes is 

a. 150--250 nucleotides long 

b. 200-300 nucleotides 

c. 1000-2000 nucleotdes 

d. 100-200 nucleotides 


Answer- 100-200 nucleotides


Que- In alkaptonuria 

a. Patient's urine contains homogenetisic acid 

b. Urine becomes black 

c. Both a and b 

d. Urine contains phenylalanine. 


Answer- Both a and b


Que- The sequence of nucleotides that determines the amino acid sequence of a protein is 

a. Chromosome 

b. DNA 

c. RNA 

d. Gene 


Answer- Gene


Que- Central dogma is 

a. Transfer of information from DNA to mRNA 

b. Basic mechanism of reading and expressing genes 

c. Transfer of information from RNA to proteins 

d. Synthesis of all three types of RNA 


Answer- Basic mechanism of reading and expressing genes


Que- In prokaryotes there are 

a. Three types of DNA polymerases 

b. One type of RNA polymerase 

c. Three types of RNA polymerase 

d. Both a and b 


Answer- Both a and b

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