Scrotum helps in maintaining the temperature of the testes which is A lower than the normal body temperature. Each testis has about B compartments called testicular lobules. Select the option that fills the blanks correctly.

         A               B

1.  1-3°C            300

2.  2-2.5°C         250

3.  3-3.5°C         250

4.  2-2.5°C         350

Given below is the structure of sperm of the human male

Identify the structure ‘X’ and choose the option representing the correct description/function of X.

1. Contains chromosomal material

2. Provides energy source for swimming

3. Contains enzyme that helps in fertilization of the ovum

4. Secretes hormone for maturation and its motility

In the female reproductive system, the funnel-shaped part of the fallopian tube closest to the ovary is

1. Isthmus

2. Infundibulum

3. Ampulla

4. Fundus

The menstrual flow results due to the breakdown of the glandular layer that lines the uterine cavity. This inner layer is

1. Perimetrium

2. Endometrium

3. Myometrium

4. Germinal epithelium

In a functional mammary gland, the cells of _________ secrete milk, which is stored in the cavities of alveoli. Choose the option that fills the blank correctly.

1. Alveoli

2. Lactiferous duct

3. Mammary ducts

4. Areola

At the end of the second meiotic division, the human female germ cells differentiate to form

1. Oogonia

2. First polar body

3. Second polar body

4. Primary oocyte

Choose the incorrect match

How many of the following statements are true regarding follicle stimulating hormone?

(i) FSH secreted by anterior pituitary cells, is called gonadotropin

(ii) Its target organs are the ovaries and testes

(iii) In the ovaries, it stimulates the secretion of ovarian hormones

(iv) In the testes, it stimulates the production of sperm

1. Only (i), (ii), (iii)

2. Only (ii), (iii), (iv)

3. (i), (ii), (iii), (iv)

4. Only (i), (iii)

1. $\left(\mathrm{i}\right)\to \left(\mathrm{a}\right),\left(\mathrm{ii}\right)\to \left(\mathrm{c}\right),\left(\mathrm{iii}\right)\to \left(\mathrm{b}\right),\left(\mathrm{iv}\right)\to \left(\mathrm{d}\right)$

2. $\left(\mathrm{i}\right)\to \left(\mathrm{c}\right),\left(\mathrm{ii}\right)\to \left(\mathrm{d}\right),\left(\mathrm{iii}\right)\to \left(\mathrm{b}\right),\left(\mathrm{iv}\right)\to \left(\mathrm{a}\right)$

3. $\left(\mathrm{i}\right)\to \left(\mathrm{c}\right),\left(\mathrm{ii}\right)\to \left(\mathrm{b}\right),\left(\mathrm{iii}\right)\to \left(\mathrm{d}\right),\left(\mathrm{iv}\right)\to \left(\mathrm{a}\right)$

4. $\left(\mathrm{i}\right)\to \left(\mathrm{c}\right),\left(\mathrm{ii}\right)\to \left(\mathrm{a}\right),\left(\mathrm{iii}\right)\to \left(\mathrm{d}\right),\left(\mathrm{iv}\right)\to \left(\mathrm{b}\right)$

What induces the completion of the meiotic division of the secondary oocyte?

1. Contact of the sperm with the zona pellucida layer of ovum

2. Entry of the sperm into the cytoplasm of the ovum through the zona pellucida and the plasma membrane

3. Fast block to polyspermy

4. Release of sperms by the penis into the vagina of female