CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 21
- (a)What provides nutrition to human sperms ? State the genetic constitution of a sperm.
- (b)Mention the chromosome pair present in zygote which determines the sex of (i) a female child, and (ii) a male child.
Answer
Seminal vesicle and prostate secretions nourish sperms; a sperm is or ; XX gives a female zygote, XY a male.
(a) The secretions of the seminal vesicles (together with those of the prostate gland), added as the sperms pass along the vas deferens, provide nutrition to the sperms and make their transport easier. A sperm has chromosomes, autosomes and one sex chromosome, so its genetic constitution is either or .
(b) (i) Female child: the zygote has the sex-chromosome pair XX. (ii) Male child: the zygote has the pair XY.
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