Human Reproduction — Page 12 | NEET Biology

Q111

Which of the following cells during gametogenesis is normally diploid?

A Spermatid

B Spermatogonia

C Secondary polar body

D Primary polar body

Correct Answer

Option D

Solution

(d) Primary polar body is produced at the end of meiosis I and is still diploid.

Q112

Select the incorrect statement:

A FSH stimulates the sertoli cells which help in spermiogenesis

B LH triggers ovulation in ovary

C LH and FSH decrease gradually during the follicular phase

D LH triggers secretion of androgens from the Leydig cells

Correct Answer

Option C

Solution

(c) LH and FSH both increase (not decrease) during the follicular phase.

Q113

Match the phases: Proliferative Phase, Secretory Phase, Menstruation

A iii ii i

B i iii ii

C iii i ii

D ii iii i

Correct Answer

Option D

Solution

(d) Proliferative = follicular phase; Secretory = luteal phase; Menstruation = breakdown of endometrial lining.

Q114

The difference between spermiogenesis and spermiation is

A In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.

B In spermiogenesis spermatozoa are formed, while in spermiation spermatids are formed.

C In spermiogenesis spermatozoa are formed, while in spermiation spermatozoa are released from sertoli cells.

D In spermiogenesis spermatozoa from sertoli cells are released, while in spermiation spermatozoa are formed.

Correct Answer

Option C

Solution

(c) Spermiogenesis = spermatids → spermatozoa; Spermiation = release of sperms from sertoli cells.

Q115

Select the correct sequence of events.

A Gametogenesis-Gamete transfer-Syngamy-Zygote-Cell differentiation-Cell division-Organogenesis.

B Gametogenesis-Gamete transfer-Syngamy-Zygote-Cell division-Cell differentiation-Organogenesis.

C Gametogenesis-Gamete transfer-Syngamy-Zygote-Cell division-Organogenesis-Cell differentiation.

D Gametogenesis-Syngamy-Gamete transfer-Zygote-Cell division-Cell differentiation-Organogenesis.

Correct Answer

Option B

Solution

(b) Correct sequence: Gametogenesis → Gamete transfer → Syngamy → Zygote → Cleavage → Cell differentiation → Organogenesis.

Q116

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

A High concentration of Progesterone

B Low concentration of LH

C Low concentration of FSH

D High concentration of Estrogen

Correct Answer

Option D

Solution

(d) LH surge at mid-cycle (day 14) induced by high estrogen triggers ovulation.

Q117

Which one of the following is the correct matching of three items and their grouping category?

A ilium, ischium, pubis - coxal bones of pelvic girdle

B actin, myosin, rhodopsin - muscle proteins

C cytosine, uracil, thiamine - pyrimidines

D malleus, incus, cochlea - ear ossicles

Correct Answer

Option A

Solution

(a) Ilium, ischium and pubis are the three bones forming the innominate/coxal bones of pelvic girdle.

Q118

How many sperms are formed from a secondary spermatocyte?

A 4

B 1

C 2

D 8

Correct Answer

Option C

Solution

(c) One secondary spermatocyte (meiosis II) → 2 spermatids → 2 sperms.

Q119

Acrosome reaction in sperm is triggered by

A capacitation

B release of lysozyme

C influx of Na+

D release of fertilizin

Correct Answer

Option D

Solution

(d) Egg secretes fertilizin which triggers the acrosomal reaction in the sperm.

Q120

Grey crescent is the area

A at the point of entry of sperm into ovum

B just opposite to the site of entry of sperm into ovum

C at the animal pole

D at the vegetal pole

Correct Answer

Option B

Solution

(b) Grey crescent forms on the surface opposite the sperm entry point.