Biology
Given below are the functions of male accessory glands in humans.
(i) Prostate gland pours an acidic secretion into the semen.
(ii) The secretion of bulbo-urethral glands serves as a lubricant.
(iii) The secretion of prostate gland neutralises the alkali in a human vagina.
(iv) The secretion of seminal vesicles serves as a medium for the transportation of the sperms.
Which of the above options are correct ?
- (i) and (ii)
- (ii) and (iii)
- (ii) and (iv)
- (iii) and (iv)
Reproductive System
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Answer
(ii) and (iv)
Reason — The bulbo-urethral glands secrete a lubricating fluid. The seminal vesicles secrete a fluid that forms a major part of semen and helps in the transport of sperms.
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Gaurav and Garima are the children of Mr. and Mrs. Pandey. The children are fraternal twins.
Which of the following options explains the appropriate features of these twins ?P: Fraternal twins are produced from one zygote which splits after the morula stage and produces two children at the same time.
Q: Fraternal twins must have two opposite sexes, i.e. one boy and one girl.
R: These twins are biologically diorular or dizygotlic.
S: Two eggs are released from ovaries at a time and both get fertilized.
- P and Q
- Q and R
- R and S
- S and P
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Reason (R): The placenta develops from the fusion of the zygote and the endometrial lining, forming a specialized tissue structure that facilitates the exchange of substances between the maternal and foetal bloodstreams.
- Both A and R are True
- Both A and R are False
- A is True and R is False.
- A is False and R is True.