What structure gets implanted on the wall of the uterus during embryonic development?

1.		2.
3.		4.

In the given diagram, identify A, B, C, and D respectively:

In the given diagram, the part of the female reproductive system that undergoes cyclical changes with changes in the secretion of gonadotropins and gonadal steroids during the menstrual cycle is represented by:
  
1. A
2. B
3. C
4. D

Which of the structures shown in the following diagram contributes the source of nutrition for the sperms ejaculated in the semen?
 
1. A
2. B
3. C
4. D

Grey crescent is the area -

1. At the point of entry of sperm into ovum

2. Just opposite to the site of entry of sperm into ovum

3. At the animal pole

4. At the vegetal pole

If mammalian ovum fails to get fertilized, which one of the following is unlikely -

1. Estrogen secretion further decreases

2. Progesterone secretion rapidly declines

3. Corpus luteum will disintegrate

4. Primary follicle starts developing

Consider the following statements:

Which of the above statements are true?

Menstrual bleeding is the result of:

1. low levels of ovarian hormones
2. high levels of ovarian hormones
3. high levels of LH
4. high levels of FSH

In oogenesis, when a diploid cell undergoes meiosis, how many ova result?

1. 1

2. 2

3. 3

4. 4

Identify the incorrectly matched pair: