VGO-0146
QUESTION
Consider the following statements pertaining to function of common extenders of semen:
(1) Egg yolk milk will maintain osmotic tension and electrolyte balance
(2) Glucose provides energy to the sperm cells
(3) Buffers maintain neutral pH and osmotic pressure
(4) Glycerol enhances keeping quality of sperm cells
Choose the correct answer:
OPTIONS
(A) 1 and 2
(B) 2 and 3
(C) 3 and 4
(D) 1, 2, 3 and 4
ANSWER
(C) 3 and 4
EXPLANATION
In semen extenders, buffers help maintain a suitable pH and contribute to maintaining osmotic pressure, so statement (3) is correct. Glycerol acts as a cryoprotectant and improves the keeping quality and survival of spermatozoa during preservation, making statement (4) correct. Statement (1) is incorrect because egg yolk and milk are used mainly for their protective effects on sperm membranes, especially against cold shock, rather than primarily for maintaining osmotic tension and electrolyte balance. Statement (2) is not accepted here as stated, because although sugars can serve as energy substrates in semen extenders, glucose is not the defining component used in this classification of common extender functions. Therefore, option (C), 3 and 4, is correct.
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