1.
Spermatids derive the nourishment from
Answer : D. Sertoli cell
2.
Which one of the following types of sex chromosomes represents a male human being?
Answer : C. XY
3.
Sexually reproducing organisms contribute to their off spring
Answer : A. half of their genes
4.
Collateral glands are found in
Answer : B. Female reproductive system of cockroach
5.
Mark the correct statement:
Answer : C. Each egg is usually fertilized by one sperm
6.
Identical twins are born when
Answer : D. One sperm fertilizes one ovum zygote cleaves into twoc cells that develop independently