Biology Free Exam Questions For Practice

Biology Free Exam Questions For Practice
Very Useful For PMT and Other Medical Entrance Test



1. A scientist kept 80 generations of Drosophila in darkness, even after that the flies had normal eyes. This disapproves law of
(a) natural selection
(b) acquired characters
(c) use and disuse
(d) synthetic theory
Ans. (b)

2. If a photosynthesising plant releases oxygen containing more than the normal amount
of 18O, it is concluded that the plant has been supplied with
(a) C6H1206 containing 180
(b) H2O containing 180
(c) CO2 containing 180
(d) Oxygen in the form of ozone
Ans. (b)


3. Weismann cut off tails of mice generation after generation but tails neither disappeared nor shortened showing that
(a) Darwin was correct
(b) tail is an essential organ
(c) mutation theory is wrong
(d) Lamarckism was wrong in inheritance of acquired characters
Ans. (d)

4. The source of O2 liberated in photosynthesis is
(a) photosynthetic enzyme
(b) carbohydrate present in leaf
(c) water
(d) carbon dioxide
Ans. (c)

5. What did CHARLES DARWIN publish in 1859?
(a) Origin of Species by Natural selection
(b) Species plantarum
(c) Philosophie Zoologique
(d) De Naturien Familien
Ans. (a)

6. Which of the following wavelength of light is absorbed maximum for photosynthesis?
(a) Red light
(b) Blue light
(c) Green light
(d) Yellow light
Ans. (b)

7. The book ‘Descent of Man and Selection in Relation to Sex’ was written by:
(a) Charles Darwin
(b) J.B. Lamarck and C. Darwin
(c) F.B. Sumner and E. Darwin
(d) Robert Brown
Ans. (a)



8. Which of the following is the least effective in photosynthesis?
(a) Red light
(b), Blue light
(c) Green light
(d) Violet
Ans. (c)

9. Darwin worked on Galapagos finches. The number of species of these finches is
(a) 10
(b) 12
(c) 14
(d) 11
Ans. (c)

10. Dark reaction in photosynthesis is called so because
(a) it does not require light energy
(b) cannot occur during daytime
(c) occurs more rapidly at night
(d) it can also occur in darkness
Ans. (a)

11. Which one of the following evolutionists proposed the theory of evolution similar to
Charles Darwin’s?
(a) Alfred Russell Wallace
(b) Erasmus Darwin
(c) Thomas Godfrey
(d) Thomas Robert Malthus
Ans. (a)

12. The primary acceptor during CO2 fixation in C3 plants is
(a) ribulose biphosphate
(b) glycolate
(c) phosphoenolpyruvate
(d) triosephosphate
Ans. (a)

13. The ultimate source of organic variation is
(a) natural selection
(b) sexual reproduction
(c) hormonal action
(d) mutations
Ans. (d)

14. First stable compound in C3 cycle is
(a) phosphoglyceraldehyde
(b) phosphoglyceric acid
(c) fructose -1-6 diphosphate
(d) glucose -6-phosphate
Ans. (a)

15. Famous palaeobotanist of India was
(a) P. Maheshwari
(b) S.R. Kashyap
(c) B.P. Pal
(d) B. Sahni
Ans. (d)

16. Which one of the following would not limit photosynthesis?
(a) Oxygen
(b) Carbon dioxide
(c) Light
(d) Chlorophyll
Ans. (a)



17. Compensation point is
(a) where there is neither photosynthesis nor respiration
(b) when rate of photosynthesis is equal to the rate of respiration
(c) when there is enough water just to meet the requirements of plant
(d) when the entire food synthesised in photosynthesis remain unutilized
Ans. (b)

18. Which would do maximum harm to a tree?
(a) The loss of all of its leaves
(b) The loss of half of its branches
(c) The loss of its bark
(d) The loss of half of its leaves
Ans. (a)

19. Phloem always flows from a
(a) sugar source to sugar sink
(b) sugar sink to sugar source
(c) leaf to the xylem to the phloem
(d) leaf to a root
Ans. (a)



20. Digestion within a digestive tract is
(a) incomplete
(b) extracellular
(c) the same as absorption
(d) an irreversible process
Ans. (b)

21. The main function of prolonged chewing is to rupture
(a) membranes
(b) cell wall
(c) connective
(d) muscle bundle
Ans. (b)

22. Muscular contractions of alimentary canal are
(a) circulation
(b) deglutition
(c) peristalsis
(d) churning
Ans. (c)

23. With regards to natural eating habits, a human is
(a) an herbivore
(b) a carnivore
(c) an omnivore
(d) a granivore
Ans. (c)

24. Which of the following animals has no need for a gall bladder?
(a) Horse
(b) Lion
(c) Dog
(d) Human
Ans. (a)

25. Which of the following regions of the alimentary canal of man does not secrete a
digestive enzyme?
(a) esophagus
(b) Stomach
(c) Duodenum
(d) Mouth
Ans. (a)


26. Bulk of the tooth in mammals is made up of
(a) dentine
(b) enamel
(c) pulp cavity
(d) root
Ans. (a)


27. Diastema is associated with
(a) presence of certain teeth
(b) absence of certain teeth
(c) absence of tongue
(d) presence of tongue
Ans. (b)

28. Among mammals, an herbivore has
(a) more teeth than carnivore
(b) flatter teeth than carnivore
(c) teeth that are more pointed than carnivore
(d) fever teeth than a carnivore
Ans. (b)

29. A dental disease characterised by mottling of teeth is due to the presence of an
ingredient in drinking water, namely
(a) fluorine
(c) boron
(b) mercury
(d) chlorine
Ans. (a)

30. About how much saliva does a person produce each day?
(a) 100 ml
(b) 250 ml
(c) 500 ml
(d) 1500 ml
Ans. (d)

31. A digestive enzyme, salivary amylase, in the saliva begin digestion of
(a) protein
(b) nucleic acids
(c) facts
(d) carbohydrates
Ans. (d)


32. In the presence of lactase, lactose breaks down into molecules of
(a) glucose and galactose
(b) glucose and fructose
(c) galactose only
(d) glucose only
Ans. (a)

33. Saliva has the enzyme
(a) pepsin
(b) ptyalin
(c) trypsin
(d) rennin
Ans. (b)

34. Which of the following enzyme acts efficiently at pH two?
(a) Trypsin
(b) pepsin
(c) Ptyalin
(d) All of above
Ans. (b)


35. Which category of compound is most concentrated energy source?
(a) Lipid
(b) Carbohydrates
(c) Proteins
(d) Vitamins
Ans. (a)



36. The original function of the vertebrate stomach was
(a) storage
(b) digestion
(c) enzyme secretion
(d) absorption
Ans. (a)


37. If the stomach did not produce any hydrochloric acid, which enzyme will not
function?
(a) Ptyalin
(b) Trypsin
(c) Pepsin
(d) Collagenase
Ans. (c)


38. Brunner’s glands are present in the
(a) stomach
(b) liver
(c) small intestine
(d) large intestine
Ans. (c)

39. Peyer’s patches produce
(a) lymphocytes
(b) enterokinase
(c) mucous
(d) trypsin
Ans. (a)

40. Crypts of Lieberkuhn are present in
(a) pancreas and secrete pancreatic juice
(b) sma1l intestine and secrete digestive enzymes
(c) stomach and secrete dilute hydrochloric
(d) stomach and secrete pepsin
Ans. (b)

41. Which of the following plays a key absorption and distribution of fats?
(a) Lacteals
(b) Villi
(c) Secretin
(d) Segmentation movements
Ans. (a)

42. In a villus, some of the glycerol and fatty are combined to form fats, coated with
proteins, and then transported as chylomicrons to
(a) lacteal
(b) capillaries
(c) lumen of the small intestine
(d) lumen of the large intestine
Ans. (a)



43. Which of the following are produced from the pancreas?
(a) Three digestive enzymes and three hormones
(b) Two digestive enzymes and one hormone
(c) Three digestive enzymes and two hormones
(d) Three digestive enzyme and one hormone
Ans. (c)

44. Which of the following cells of pancreas produce insulin?
(a) Alpha cells
(b) B cells
(c) Beta cells
(d) T cells
Ans. (c)


45. Glisson’s capsules are found in
(a) kidney of frog
(b) heart of frog
(c) liver of mammals
(d) cerebellum of rabbit
Ans. (c)