Free Human Reproduction (Weekly Quiz: 3) NEET Biology Questions & Answers with Detailed Explanation & Full Review

Free Human Reproduction (Weekly Quiz: 3) Time:

Question-1

Which of the following shows the correct sequence of events leading to the formation of mature sperm?

(a)

(b)

(c)

(d)

Explanation:

Answer: (d)

A spermatogonium divides into two primary spermatocytes. Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis - I to produce two haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergoes meiosis II to produce two haploid spermatids.


Question-2

Which of the following depicts the correct pathway of transport of sperms?

(a)

(b)

(c)

(d)


Question-3

The given figure shows the diagrammatic sectional view of female reproductive system with few structures marked as A, B, C, and D. Select the option which shows the correct identification of the structure with its characteristics.

human-reproduction-class-12-Chapter-3-neet-mcq-5-25-99-222

(a)

(b)

(c)

(d)

Explanation:

Answer: (a)

The structure marked as A, B, C and D in the given figure of female reproductive system are respectively isthmus, ampulla, infundibulum and fimbriae. Isthmus is the narrower part of the tube that links to the uterus and the interstitial part that transverses the uterine musculature. Ampulla is the part behind the infundibulum, where fertilization of ovum takes place. Infundibulum is a funnel shaped structure whose edges possess finger like projection called fimbriae. Fimbriae help in the collection of ovum after ovulation.


Question-4

Which of the following hormones is not secreted by human placenta?

(a)

(b)

(c)

(d)


Question-5

Choose the incorrect pair.

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

It can be corrected as Antrum is the fluid-filled cavity which is found in tertiary follicle or Graafian follicle. Rest of the matches are correct.


Question-6

Identify the human developmental stage shown as well as the related right place of its occurrence in a normal pregnant woman and select the right option for the two, together.human-reproduction-class-12-Chapter-3-neet-mcq-test
 Developmental stageSite of occurrence
(a)Late morula– Middle part of Fallopian tube
(b)Blastula– End part of Fallopian tube
(c)Blastocyst– Uterine wall
(d)8-celled morula– Starting point of Fallopian tube

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

After fertilisation, zygote undergoes rapid mitotic divisions, called cleavage, which is characterised by absence of growth of daughter cells. This leads to the conversion of single celled zygote into a multicellular structure called blastocyst or blastula. Implantation or embedding of zygote into endometrium of uterus occurs in blastocyst stage.


Question-7

Hormones secreted by the placenta to maintain pregnancy are

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

Placenta acts as endocrine tissue and secretes the following hormones to maintain pregnancy

  • human Chorionic Gonadotropin (hCG) It stimulates and maintains the corpus luteum to secrete progesterone until the end of pregnancy.
  • human Placental Lactogen (hPL) It is also known Human Chorionic Somatomammotropin (HCS), it stimulates the growth of mammary glands during pregnancy.
  • Progesterone and oestrogen support foetal growth, maintain pregnancy, inhibit uterine contractions, etc.


Question-8

Which of the following indicates pregnancy?

(a)

(b)

(c)

(d)

Explanation:

Answer: (b)

During pregnancy all events of the menstrual cycle stop and there is no menstruation.


Question-9

Withdrawal of which of the following hormones is the immediate cause of menstruation?

(a)

(b)

(c)

(d)

Explanation:

Answer: (c)

Progesterone hormone which is secreted by the corpus luteum in the ovaries is responsible to stop ovulation(during pregnancy) and fixes the foetus to the uterine wall, facilitates placenta formation and controls the foetus development in uterus. If this hormone is withdrawn then fixation of foetus to uterine wall will not take place, formation of placenta will also not take place, ovulation starts from the ovaries and hence in human female menstruation starts.


Question-10

The function of acrosome is

(a)

(b)

(c)

(d)


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