Question

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Answer 1

Explanation:

9. spoons, ornaments, motor vehicles, kitchen gas burner, handles of doors, bottom of cooking utensils.

10. every humans have 23 pairs of chromosomes. two out of these are sex chromosomes named X and Y. A girl has two X chromosome while a boy has 1 X and 1 Y chromosome

sex determination of unborn baby is by sperms. an unfertilised egg always contains a X chromosome. But sperms are of 2 types. X and Y sperms. if a X sperm fertilizes with the egg then the zygote contains two X chromosomes. Later this develops into a girl. If a Y sperm fertilizes with the egg then the zygote contains one X and one Y chromosomes. Later this develops into a boy.

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