Biology MCQs Archives

31. Poison glands of snakes are homologous to

A. electric organs of fishes

B. stings of rays

C. sebaceous glands of mammals

D. salivary glands of vertebrates

✅ The correct answer is option D.

32. Pollen grains in plants are produced in

A. roots

B. leaves

C. flower

D. stem

✅ The correct answer is option C.

33. Monotremes are unique mammals because they

A. posses hair

B. give birth to live young

C. secret milk in a pouch

D. lay eggs

✅ The correct answer is option D.

34. Mycobacterium leprae causes leprosy, Corynebacterium diphtheria causes diphtheria and Vibrio comma causes

A. tetanus

B. influenza

C. cholera

D. typhoid

✅ The correct answer is option C.
Vibrio cholerae (also Kommabacillus) is a gram negative comma-shaped bacterium with a polar flagellum that causes cholera in humans

35. Plants wilt due to excess of

A. transpiration

B. photosynthesis

C. absorption

D. None of these

✅ The correct answer is option A.

36. Oxyreductases, transferases, hydrolases, lyases, isomerases and ligases are all classes of

A. hormones

B. enzymes

C. proteins

D. vitamins

✅ The correct answer is option B.

37. Osmosis is the flow of solution from higher concentration to a solution of lower concentration through a semi permeable membrane. What is incorrect in this statement?

A. Exact concentration of solution is not given

B. Character of semi permeable membrane is not given

C. The flow of solution is not possible through semi permeable membrane

D. All are incorrect

✅ The correct answer is option C.

38. Prothrombin which helps in clotting of blood is released by

A. lymphocytes

B. erythrocytes

C. monocytes

D. blood platelets

✅ The correct answer is option D.

39. Rain water helps to increase the ____ to some extent.

A. phosphorous contents

B. nitrogen contents

C. calcium contents

D. potash contents

✅ The correct answer is option C.

40. Number of chromosomes in Down’s syndrome is

A. 46

B. 47

C. 48

D. 49

✅ The correct answer is option B.