Biology Science Practice Test Paper

Biology Science Practice Test Paper

Solved Biology MCQ Paper

1. If a photosynthesising plant releases oxygen containing more than the normal amount

of ¹⁸0, 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)

2. The source of 0₂ liberated in photosynthesis is

(a) photosynthetic enzyme

(b) carbohydrate present in leaf

(c) water

(d) carbon dioxide

Ans. (c)

3. Which of the following is the least effective in photosynthesis?

(a) Red light

(b), Blue light

(c) Green light

(d) Violet

Ans. (c)

4. 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)

5. The primary acceptor during CO₂ fixation in C₃ plants is

(a) ribulose biphosphate

(b) glycolate

(c) phosphoenolpyruvate

(d) triosephosphate

Ans. (a)

6. Which one of the following would not limit photosynthesis?

(a) Oxygen

(b) Carbon dioxide

(c) Light

(d) Chlorophyll

Ans. (a)

7. 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)

8. 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)

9. The main function of prolonged chewing is to rupture

(a) membranes

(b) cell wall

(c) connective

(d) muscle bundle

Ans. (b)

10. With regards to natural eating habits, a human is

(a) an herbivore

(b) a carnivore

(c) an omnivore

(d) a granivore

Ans. (c)

11. 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)

12. Bulk of the tooth in mammals is made up of

(a) dentine

(b) enamel

(c) pulp cavity

(d) root

Ans. (a)

13. 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)

14. 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)

15. A digestive enzyme, salivary amylase, in the saliva begin digestion of

(a) protein

(b) nucleic acids

(c) facts

(d) carbohydrates

Ans. (d)

16. Saliva has the enzyme

(a) pepsin

(b) ptyalin

(c) trypsin

(d) rennin

Ans. (b)

17. Which of the following enzyme acts efficiently at pH two?

(a) Trypsin

(b) pepsin

(c) Ptyalin

(d) All of above

Ans. (b)

18. Which category of compound is most concentrated energy source?

(a) Lipid

(b) Carbohydrates

(c) Proteins

(d) Vitamins

Ans. (a)

19. The original function of the vertebrate stomach was

(a) storage

(b) digestion

(c) enzyme secretion

(d) absorption

Ans. (a)

20. If the stomach did not produce any hydrochloric acid, which enzyme will not

function?

(a) Ptyalin

(b) Trypsin

(c) Pepsin

(d) Collagenase

Ans. (c)

21. Brunner’s glands are present in the

(a) stomach

(b) liver

(c) small intestine

(d) large intestine

Ans. (c)

22. Peyer’s patches produce

(a) lymphocytes

(b) enterokinase

(c) mucous

(d) trypsin

Ans. (a)

23. 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)

24. Which of the following plays a key absorption and distribution of fats?

(a) Lacteals

(b) Villi

(c) Secretin

(d) Segmentation movements

Ans. (a)

25. 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)