There is no cell division involved in
(A) spermatogenesis
(B)Oogenesis
(C) embryogenesis
(D) spermiogenesis

N/C ratio after cell division

(b) Differences between Oogenesis and Spermatogenesis.

The steps involved in spermatogenesis are given below. Arrange them in proper sequence and select the correct option. A. Primary spermatocytes undergo the first meiotic division. B. Spermatogonia multiply by mitotic division. C. Transformation of spermatids into sperms. D. Secondary spermatocytes undergo the second meiotic division. E. Release of sperms from the seminiferous tubules.

Assertion Sertoli cells are being involved in the process of spermatogenesis. Reason Nutrition of developing sperms is provided by Sertoli cells.

(a) Draw a diagrammatic sectional view of a seminiferous tubule (enlarged) of human male and label (i) Spermatogenium, (ii) Sertoli cell, (iii) Primary spermatocyte. Write the function of each labelled part. (b) Differentiate between spermatogenesis and spermiogenesis.

(a) Name the hormone that initiates spermatogenesis in humans. Describe the process of spermatogenesis in spermatogenesis in sequence mentioning the ploidy of the cells at each step. (b) Draw the diagram of a mature human sperm and label the parts that : (i) helps it reaching to the ovum . (ii) providing energy for it to reach the ovum. (iii) helping it to gain entry into the ovum.

Assertion: During embryogenesis, cell division increase the number of cells in the developing embryo. Reason: During embryogenesis, cell differentiation helps group of cells to undergo certain modification to form specialised tissues and organs to form an organism.

A: Zygote is the first cell of the new ganeration in all sexually reproducing organisms. R: Cell division and cell differenttiation are the stages of embryogenesis. R: Cell division and cell differentiation are the stages of embrygenesis.

Assertion: The process of oogenesis is markedly different from spermatogenesis. Reason: Oogenesis is initiated during the embryonic development stage when a cople of million gamete mother cells (oogonia) are found in both fetal ovary.