Human Reproduction

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

1. (A) is not correct but (R) is correct
2. Both (A) and (R) are correct and (R) is the correct explanation of (A)
3. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
4. (A) is correct but (R) is not correct

Receptors for sperm binding in mammals are present on :

1. Zona pellucida
2. Corona radiata
3. Vitelline membrane
4. Perivitelline space

Which of these is not an important component of initiation of parturition in humans?

1. Release of Prolactin
2. Increase in estrogen and progesterone ratio
3. Synthesis of prostaglandins
4. Release of Oxytocin

Which of the following secretes the hormone, relaxin, during the later phase of pregnancy?

1. Uterus
2. Graafian follicle
3. Corpus luteum
4. Foetus

Meiotic division of the secondary oocyte is completed

1. At the time of fusion of a sperm with an ovum
2. At the time of copulation
3. Prior to ovulation
4. After zygote formation

Which of the following hormone levels will cause release of ovum (ovulation) from the Graafian follicle?

1. Low concentration of FSH
2. High concentration of Progesterone
3. Low concentration of LH
4. High concentration of Estrogen

Match the following columns and select the correct option.

1. (A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)
2. (A)-(i), (B)-(iv), (C)-(ii), (D)-(iii)
3. (A)-(iv), (B)-(iii), (C)-(i), (D)-(ii)
4. (A)-(iii), (B)-(ii), (C)-(iv), (D)-(i)

Extrusion of second polar body from egg nucleus occurs :

1. Before entry of sperm into ovum
2. Simultaneously with first cleavage
3. After entry of sperm but before fertilization
4. After fertilization

Select the correct sequence for transport of sperm cells in male reproductive system :

1. Seminiferous tubules Vasa efferentia Epididymis Inguinal canal Urethra
2. Testis Epididymis Vasa efferentia Vas deferens Ejaculatory duct Inguinal canal Urethra Urethral meatus
3. Testis Epididymis Vasa efferentia Rete testis Inguinal canal Urethra
4. Seminiferous tubules Rete testis Vasa efferentia Epididymis Vas deferens Ejaculatory duct Urethra Urethral meatus

Hormones secreted by the placenta to maintain pregnancy are

1. hCG, hPL, progestogens, prolactin
2. hCG, hPL, estrogens, relaxin, oxytocin
3. hCG, hPL, progestogens, estrogens
4. hCG, progestogens, estrogens, glucocorticoids