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

NEET-2021 [Human-Reproduction] [class-xii ]

• Graafian follicle
• Corpus luteum
• Foetus
• Uterus
Correct Option: B  [ Corpus luteum ]

Remark:

Match the following columns and select the correct option.

NEET-(Sept)2020 [Human-Reproduction] [class-xii ]

• (A)-(IV), (B)-(III), (C)-(I), (D)-II)
• (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
• (A)-(III), (B)-(II), (C)-(IV), (D)-(I)
• (A)-(II), (B)-(III), (C)-(IV), (D)-(I)
Correct Option: D  [ (A)-(II), (B)-(III), (C)-(IV), (D)-(I) ]

Remark:

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

NEET-(Sept)2020 [Human-Reproduction] [class-xii ]

• High concentration of Estrogen
• High concentration of Progesterone
• Low concentration of LH
• Low concentration of FSH
Correct Option: A  [ High concentration of Estrogen ]

Remark:

Meiotic division of the secondary oocyte is completed:

NEET-(Sept)2020 [Human-Reproduction] [class-xii ]

• Prior to ovulation
• At the time of copulation
• After zygote formation
• At the time of fusion of a sperm with an ovum
Correct Option: D  [ At the time of fusion of a sperm with an ovum ]

Remark:

Select the correct option of haploid cells from the following groups:

NEET-(Oct)2020 [Human-Reproduction] [class-xii ]

• Primary oocyte, Secondary oocyte, Spermatid
• Secondary spermatocyte, First polar body, Ovum
• Spermatogonia, Primary spermatocyte, Spermatid
• Primary spermatocyte, Secondary spermatocyte, Second polar body
Correct Option: B  [ Secondary spermatocyte, First polar body, Ovum ]

Remark:

Match the following columns and select the correct option:

NEET-(Oct)2020 [Human-Reproduction] [class-xii ]

• (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• (A)-(I), (B)-(II), (C)-(III), (D)-(IV)
• (A)-(i), (B)-(III), (C)-(II), (D)-(IV)
• (A)-(II), (B)-(I), (C)-(IV), (D)-(iii)
Correct Option: D  [ (A)-(II), (B)-(I), (C)-(IV), (D)-(iii) ]

Remark:

In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

NEET-(Oct)2020 [Human-Reproduction] [class-xii ]

• Eyelids and eyelashes are formed
• Most of the major organ systems are formed
• The head is covered with fine hair
• Movement of the foetus
Correct Option: B  [ Most of the major organ systems are formed ]

Remark:

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

NEET-2019 [Human-Reproduction] [class-xii ]

• Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra → Urethral meatus
• Testis → Epididymis → Vasa efferentia → Rete testis → Inguinal canal → Urethra
• Seminiferous tubules → Vasa efferentia → Epididymis → Inguinal canal → Urethra
• Testis → Epididymis → Vasa efferentia → Vas deferens → Ejaculatory duct → Inguinal canal ® Urethra ® Urethral meatus
Correct Option: A  [ Seminiferous tubules → Rete testis → Vasa efferentia → Epididymis → Vas deferens → Ejaculatory duct → Urethra → Urethral meatus ]

Remark:

What is the fate of the male gametes discharged in the synergid?

NEET-2019 [Human-Reproduction] [class-xii ]

• One fuses with the egg and other fuses with central cell nuclei.
• One fuses with the egg, other(s) fuse(s) with synergid nucleus.
• All fuse with the egg.
• One fuses with the egg, other(s) degenerate(s) in the synergid.
Correct Option: A  [ One fuses with the egg and other fuses with central cell nuclei. ]

Remark:

Extrusion of second polar body from egg nucleus occurs:

NEET-2019 [Human-Reproduction] [class-xii ]

• simultaneously with first cleavage
• before entry of sperm into ovum
• after fertilization
• after entry of sperm but before fertilization
Correct Option: D  [ after entry of sperm but before fertilization ]

Remark: