Test Your Knowledge - BIOLOGY MCQ PRACTICE
by Saksham Chaudhry : Lancers Convent, Prashant Vihar, New Delhi 110085
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A fresh set of 20 random questions is generated every time you open this page and every time you refresh it.
For each of the following multiple choice questions, choose the most appropriate answer :

1. In males, testes are contained in scrotal sacs because
A. other organs do not make space for testes in the abdominal cavity 
B. testes, if let loose in the abdomen, would hamper the process of sperm maturation 
C. a slightly lower suitable temperature is furnished by the scrotum and it does not hamper sperm formation 
D. all of these 

2. On the basis of symptoms of chlorosis in leaves a student inferred that this was due to deficiency of nitrogen. The inference could be correct only if we assume that yellowing of leaves appeared first in
A. old leaves 
B. young leaves 
C. young leaves followed by mature leaves 
D. mature leaves followed by young leaves 

3. Which is correctly associated?
A. RNA:thymine 
B. DNA:uracil 
C. RNA:replication 
D. RNA:ribosesugars 

4. The number of chromosomes in a normal human cell is
A. 43 
B. 44 
C. 45 
D. 46 

5. The source of somatostatin is same as that of
A. Thyroxine and calcitonin 
B. Insulin and glucagon 
C. Somatotropin and prolactin 
D. Vasopresin and oxytocin 

6. Which of the following is black-yellow pigment of carrot roots
A. Fucoxanthin 
B. Violoxanthin 
C. Beta-carotene 
D. Alpha-carotene 

7. A person passes much urine and drinks much water but blood glucose level is normal . This condition may be the result of
A. A reduction in insulin secretin from pancreas 
B. A reduction in vasopression secretion from posterior pituitary 
C. A fall in the glucose concentration in urine 
D. An increase in secretion of glucagon 

8. Which one of the following statements with regard to embryonic development in humans is correct ?
A. Cleavage divisions bring about considerable increase in the mass oi protoplasm 
B. b. In the second cleavage division, one of the two blastomers usually divides a little sooner than the second 
C. 3. With more cleavage divisions, the resultant blastomeres become larger and larger 
D. . Cleavage division results in a hollow ball of cells called morula 

9. Bile, which is important in the digestion of fats, is produced by the
A. liver 
B. duodenum 
C. stomach 
D. lacteals 

10. Grain colour in wheat is determined by three pairs of polygene. Following the cross AABBCC. dark colour x aabbcc light colour, in F, generation what proportion of the progeny is likely to resemble either parent?
A. Half 
B. Less than 5 percent 
C. One third 
D. None of the above 

11. Major part of semen is secreted by
A. Bartholin's gland 
B. Compeer's gland 
C. Seminal vesicle 
D. Prostate gland 

12. Rh-related hemolytic anemia of the newborn erythroblastosis foetalis may result when the
A. mother is Rh negative and the foetus is Rh positive 
B. father and mother are Rh positive. but the fetus is Rh negative 
C. mother is Rh positive and the foetus in Rh negative 
D. ld father, mother, and fetus are all Rh positive 

13. The artificial kidney operates on the principle of
A. diffusion 
B. osmosis 
C. dialysis 
D. active transport 

14. Which of the following is not a class of arthropods?
A. Myriapoda 
B. Onychophora 
C. Polychaeta 
D. lnsecta 

15. The secondary wood of Pinus is characterised by
A. Presence of vessels 
B. Absence of resin ducts 
C. Presence of resin ducts 
D. Presence of resin canals 

16. ln calves that consume large quantities of milk,the curdling of milk takes place due to
A. a large variety of useful bacteria 
B. the high acid content of gastric juice 
C. the action of rennin 
D. the action of pepsin 

17. Consumption of fish is considered to be healthy when compared to flesh of other animals because fish contains :
A. polyunsaturated fatty acids 
B. saturated fatty acids 
C. essential vitamins 
D. more carbohydrates and proteins 

18. Enzymes involved in chemical reactions
A. decompose during reactions 
B. are used up during reactions 
C. react more rapidly as reactions progress 
D. are not used up during reactions 

19. which of the following sugars are components of cane sugar?
A. glucose and fructose 
B. glucose and galactose 
C. glucose and mannose 
D. glucose and ribose 

20. Clove, the commonly used spice, is obtained from the
A. root 
B. Stem 
C. flower bud 
D. fruit 

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