zoology biology mcq

zoology biology mcq
biology multiple choice questions
Online Biology MCQ

1. ‘Salmon’ fishes are group of fishes belonging 41 to:

(a) Cod fish

(b) Trout

(c) Bony fish

(d) Cartilaginous fish

Ans. (b)

2. Renal portal system is absent in:

(a) Reptiles

(b) Amphibians

(c) Mammals

(d) Birds

Ans. (c)

3. Water reabsorption in kidney is controlled by:

(a) Aldosteron

(b) ADN

(c) GH

(d) Oxytocin

Ans. (b)

4. Hypercromism is presence of:

(a) Same type of chromosome less than one

(b) Highly pertinacious chromosomes

(c) Same type of chromosome more than one

(d) Dark colored skin

Ans. (c)

5. Relaxin is released from:

(a) Testis

(b) Pituitary

(c) Adrenal

(d) Ovary

Ans. (d)

6. Mammary glands are modification of:

(a) Meibomian glands

(b) Sweat glands

(c) Sebaceous gland

(d) None of the above

Ans. (b)

7. A ‘drunken person’ has the earliest effect on brains

(a) Cerebrum

(b) Medulla oblongata

(c) Cerebellum

(d) Frontal

Ans. (c)

8. Antibodies are:

(a) Carbohydrates

(b) Immunoglobulin

(c) Globular proteins

(d) Extrinsic proteins

Ans. (b)

9. Fertilized ovum in human is transplanted in the uterus after:

(a) one day of fertilization

(b) 7 days of fertilization

(c) 10 days of fertilization

(d) 15 days of fertilization

Ans. (b)

10. Dinosaurs became extinct in:

(a) Permian period

(b) Triassic period

(c) Cretaceous period

(d) Jurassic period

Ans. (c)

11. An immune disease in which the body destroys the ill functioning thyroid gland itself is:

(a) Simmond’s disease

(b) Myxodema

(c) Hashimoto’s disease

(d) Hurler’s disease

Ans. (c)

12. Failure of decent of testes in scrotal sac called

(a) crypto-orchidism

(b) Vasectomy

(c) Impotency

(d) Tubectomy

Ans. (a)

13. Highest cranial capacity is present in:

(a) Peking man

(b) Java man

(c) Cro-Magnon man

(d) Neanderthal man

Ans. (c)

14. Hand of man, wing of bat, flipper of seal represents:

(a) Analogous organs

(b) Homologous organs

(c) Vestigial organs

(d) Essential organs

Ans. (b)

15. Humoral immune system comprises of:

(a) Monocytes

(b) Lymphocytes

(c) ‘B’ and ‘T’ lymphocytes

(d) RBC

Ans. (c)

16. Hydra is a:

(a) Freshwater, radial symmetrical and diploblastic animal

(b) Marine, radial symmetrical and diploblastic animal

(c) Marine, radial symmetrical and diploblastic plant

(d) Freshwater, bilateral symmetrical and diploblastic animal

Ans. (a)

17. Which DNA molecule among the following will melt at lowest temperature?

(a) 5’-G-c-A-T-G–C-T 3’

3’ C-G-T-A-T-C-G–A-5

(b) 5’-A-A-T-A-A-A-G-C-T-3’

3’-T-T-A-T-T-T-C-G-A-5’

(c) 5’-A-T-G–C-T-G-A-T 3’

3’-T-A-C-G-A-C-T-A-5’

(d) 5’-A-A-T-A-G—C-T–G-C-3’

3’-T-T-T-A-C–G–A–C–G-S’

Ans. (b)

18. Crayfish is a:

(a) Arthropod

(b) Fish

(c) Mollusc

(d) Virus

Ans. (a)

19. Leishmania tropica causes:

(a) Sleeping sickness

(b) Kala-azar

(c) Fibrosis

(d) Oriental sore

Ans. (d)

20. Shell of mollusc is produced by its:

(a) Radula

(b) Mantle

(c) Visceral mass

(d) Pedal structure

Ans. (b)

21. Limulus belongs to class:

(a) Crustacea

(b) Insect

(c) Arachnida

(d) Onychophora

Ans. (c)

22. Trypanosome causes:

(a) Sleeping sickness

(b) Kala-azar

(c) Diarrhea

(d) Colitis

Ans. (a)

23. Squid, Cuttle fish and Octopus belong to class:

(a) Decapods

(b) Cephalopodan

(c) Scaphopoda

(d) Apoda

Ans. (b)

24. Mostly reared silk worm in India is:

(a) Anthera roylei

(b) Anthera assama

(c) Anthera dorsata

(d) Bombyx mori

Ans. (d)

25. Ovulation in females is under the control of:

(a) ADH and LH

(b) LTH and TSH

(c) T3 and TSH

(d) FSH and LH

Ans. (d)

26. Honey bee species reared most widely in India in artificial hives is

(a) Apis florea

(b) Apis indica

(c) Apis dorsata

(d) Apis rejuvenate

Ans. (d)

27. Laurer’s canal is present in:

(a) Fasciola

(b) Ascaris

(c) Cockroach

(d) Taenia

Ans. (a)

28. Hormone, which helps in metamorphosis in insects is:

(a) Ecdysone

(b) Pheromone

(c) Thyroxine

(d) Pitutrine

Ans. (a)

29. Jelly over frog’s egg is formed:

(a) During fertilization

(b) After fertilization in water

(c) After fertilization outside water

(d) None of the above

Ans. (b)

30. The character common in reptiles and birds is:

(a) diaphragm

(b) Homoeothermic

(c) Teates

(d) Amnion

Ans. (d)

31. Closely related, morphologically similar sympatric populations, but reproductively isolated, are. Designated as:

(a) Clones

(b) Dine

(c) Sibling species

(d) Demes

Ans. (c)

32. Discoidal placenta is found in:

(a) Rabbit

(b) Sheep

(c) Pig

(d) Deer

Ans. (a)

33. The joint of radio-ulna with the upper arm is:

(a) Pivot joint

(b) Socket joint

(c) Fixed joint

(d) Hinge joint.

Ans. (d)

34. The blood is carried from lungs to heart by:

(a) Cardiac vessel

(b) Pulmonary vein

(c) Pulmonary artery

(d) Carotid vein

Ans. (b)

35. DNA replication takes place in:

(a) M-phase

(b) G1-phase

(c) S-phase

(d) G2-phase

Ans. (c)

36. An auto-immune disease is

(a) Hemophilia

(b) Albinism

(c) Myasthenia gravis

(d) Herpes

Ans. (c)

37. A disease common in Africans is:

(a) Pernicious anemia

(b) Sickle cell anemia

(c) Malaria

(d) Hemophilia

Ans. (b)

38. Genes are responsible for the growth and differentiation in an organism through regulation of:

(a) Translation

(b) Transcription

(c) Both (a) and (b)

(d) Transformation

Ans. (c)

39. Ultra filtration is determined by:

(a) Glomerular hydrostatic pressure

(b) Colloid osmotic pressure of blood

(c) Capsular hydrostatic pressure

(d) All of the above

Ans. (d)

40. Prolonged deficiency of nicotinic acid causes

(a) Anaemia

(b) Pellagra

(c) Osteomalacia

(d) Xerophthalmia

Ans. (b)

41. An epithelial tissue which has thin flat cells, arranged edge to edge so as to appear like close packed tiles is present in inner lining of:

(a) Stomach

(b) Chee.k

(c) Chin

(d) Ovary

Ans. (b)

42. The smallest taxonomic group of animals having a cranium, vertebral column, ventral heart, pulmonary respiration and 2 pairs of legs is in class

(a) Vertebrata

(b) Chordate

(c) Tetrapoda

(d) Agnetha

Ans. (c)

43. Arachidonic acid is:

(a) Non-essential fatty acid

(b) Essential fatty acid

(c) Poly-unsaturated fatty acid

(d) Both (b) and (c)

Ans. (d)

44. Nickel is a component of enzyme:

(a) Urease

(b) Carboxylase

(c) Nitrogenase

(d) Nitrate reductase

Ans. (a)

45. Two free rib nucleotide units are interlinked with:

(a) Peptide bond

(b) Covalent bond

(C) Hydrogen bond

(d) Phosphodiester bond

Ans. (d)

46. Induced fit theory of enzyme action was given by:

(a) Koshland

(c) Sumner

(b) Fischer

(d) Buchner

Ans. (a)

47. Pasteurization is a process carried out for 30 minutes at:

(a) 40-50°C

(c) 80-100°C

(b) 60-70°C

(d) 100-120°C

Ans. (b)

48. Which statement explains the evolutionary advantage of meiosis?

(a) It is necessary for asexual reproduction

(b) It alternates mitosis from one generation to other

(c) Genetic recombinants give variability

(d) It alters the characters of parents

Ans. (c)

49. Which of the following is a transparent tissue?

(a) Hyaline cartilage

(b) Fibrous cartilage

(c) Tendons

(d) Ligaments

Ans. (a)

50. Each spinal nerve in mammal arises from the spinal cord by two roots, a dorsal and a ventral. The ventral root is composed of:

(a) Somatic motor and visceral motor fibre

(b) Somatic motor and visceral sensory fibre

(c) Somatic sensory and visceral motor fibre

(d) Somatic sensory and visceral sensory fiber

Ans. (a)