The immature male germ cell undergo division to produce sperms by the process of spermatogenesis. Choose the correct one with reference to above.
Spermatogonia have 46 chromosomes and always undergo meiotic cell division
Primary spermatocytes divide by mitotic cell division
Secondary spermatocytes have 23 chromosomes and undergo second meiotic division
Spermatozoa are transformed into spermatids
Match between the following representing parts of the sperm and their functions and choose the correct option.
| Column I |
Column II |
||
|---|---|---|---|
| A. | Head | 1. | Enzymes |
| B. | Middle piece | 2. | Sperm motility |
| C. | Acrosome | 3. | Energy |
| D. | Tail | 4. | Genetic material |
$2 \quad 4 \quad 1 \quad 3$
$\begin{array}{llll}\text { } 4 & 3 & 1 & 2\end{array}$
$\begin{array}{llll}\text { } 4 & 1 & 2 & 3\end{array}$
$\begin{array}{llll}\text { } 2 & 1 & 3 & 4\end{array}$
Which among the following has 23 chromosomes?
Spermatogonia
Zygote
Secondary oocyte
Oogonia
$$ \text { Match the following and choose the correct options. } $$
| Column I |
Column II |
||
|---|---|---|---|
| A. | Trophoblast | 1. | Embedding of blastocyst in the endometrium |
| B. | Cleavage | 2. | Group of cells that would differentiate as embryo |
| C. | Inner cell mass | 3. | Outer layer of blastocyst attached to the endometrium |
| D. | Implantation | 4. | Mitotic division of zygote |
$$ \begin{array}{llll} \text { A } & \text { B } & \text { C } & \text { D } \\ 2 & 1 & 3 & 4 \\ \end{array} $$
A B C D
$$ \begin{array}{llll} \text { } 3 & 4 & 2 & 1 \end{array} $$
$$ \begin{array}{llll} \text { } 2 & 4 & 3 & 1 \end{array} $$
Which of the following hormones is not secreted by human placenta?
hCG
Estrogens
Progesterone
LH