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Test: Gametogenesis (NCERT) - NEET MCQ


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20 Questions MCQ Test Biology Class 12 - Test: Gametogenesis (NCERT)

Test: Gametogenesis (NCERT) for NEET 2024 is part of Biology Class 12 preparation. The Test: Gametogenesis (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Gametogenesis (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gametogenesis (NCERT) below.
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Test: Gametogenesis (NCERT) - Question 1

2n=16 is in a primary spermatocyte which is in metaphase of first meiotic division. What shall be the total number of chromatids in each of the secondary spermatocyte?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 1

Secondary spermatocyte contains half the number of chromosomes i.e., 8. Each chromosome has 2 chromatids, therefore, 8 chromosomes will have 16 chromatids in all.

Test: Gametogenesis (NCERT) - Question 2

The second maturation division of the mammalian ovum occurs

Detailed Solution for Test: Gametogenesis (NCERT) - Question 2

During oogenesis, primary oocyte grows and completes- meiosis I (first maturation division) producing a large secondary oocyte and a small polar body. The secondary oocyte proceeds with meiosis II (second maturation division) but the division gets arrested at metaphase stage. It is in this stage of oocyte that the ovum is shed during ovulation. It passes into oviduct, where the cell cycle resumes only after the entry of sperm.

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Test: Gametogenesis (NCERT) - Question 3

In humans, at the end end of the first meoitic division, the male germ cells differentiate into the

Detailed Solution for Test: Gametogenesis (NCERT) - Question 3

During embryonic development the primordial germ cells migrate to the testis where they become spermatogonia. At puberty the spermatogonia proliferate rapidly by mitosis. Some undergo growth phase to become primary spermatocytes that further undergo through meiotic division I to become secondary spermatocytes. After completion of meiotic division II the secondary spermatocytes produce spermatids which differentiate to form spermatozoa.

Test: Gametogenesis (NCERT) - Question 4

Which of the following options is correct?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 4

The secondary oocyte is formed by the meiotic division of primary oocyte (2n), therefore, it is haploid. Primary spermatocyte is formed by the mitotic division of spermatogonium (2n), therefore it is diploid.

Test: Gametogenesis (NCERT) - Question 5

Consider the following statements each with two blanks.
(A) Seminiferous tubules produce (i) while Leydig's cells produce (ii).
(B) In females, urethra is small and conducts (iii) while in males it conducts urine and (iv).
(C) The process of formation of spermatozoa from spermatogonia is called (v) and the process of maturation of spermatids into spermatozoa is called (vi).
Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (vi) in the statements?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 5

To solve this question, we need to match the correct terms for the given blanks in each statement. Let's analyze each statement and its options:
Statement (A):
- Seminiferous tubules produce ______ while Leydig's cells produce ______.
- The correct terms for these blanks are (i) spermatozoa and (ii) testosterone.
Statement (B):
- In females, urethra is small and conducts ______ while in males it conducts urine and ______.
- The correct terms for these blanks are (iii) urine and (iv) semen.
Statement (C):
- The process of formation of spermatozoa from spermatogonia is called ______ and the process of maturation of spermatids into spermatozoa is called ______.
- The correct terms for these blanks are (v) spermatogenesis and (vi) spermiogenesis.
Now let's match the correct terms with the blanks for each statement:
(A) - Option A:
- (i) spermatozoa, (ii) testosterone
(B) - Option B:
- (iii) urine, (iv) semen
(C) - Option C:
- (v) spermatogenesis, (vi) spermiogenesis
Since Option A matches all the correct terms for the blanks in each statement, the correct answer is A: (i) spermatozoa, (ii) testosterone, (v) spermatogenesis, (vi) spermiogenesis.
Test: Gametogenesis (NCERT) - Question 6

Given below is an incomplete flow chart showing influence of hormones on gametogenesis in human females. Study it carefully and identify A, B, C and D.

Detailed Solution for Test: Gametogenesis (NCERT) - Question 6

Hypothalamus releases Gonadotropin releasing hormone (GnRH) that stimulates anterior pituitary to release FSH (follicle stimulating hormone) and LH (leuteinsing hormone). These hormones induce ovary to release estrogen and progesterone.

Test: Gametogenesis (NCERT) - Question 7

Rakesh and Reshma have difficulty conceiving a baby. They consulted a sex therapist. Sperm count of Rakesh was normal but the doctor observed that the motility of his sperm was less. What part of sperm do you think has the issue?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 7
  • Mitochondria are present in the middle piece of the sperm.
  • They are essential for producing energy required for movement of tail.
  • This is essential for movement through the genital tract and oviduct before sperm encounters the egg.
  • Rakesh might have less or poorly functional mitochondria, which prevent his normal count of sperms from moving along the genital tract.
Test: Gametogenesis (NCERT) - Question 8

The sperms undergo physiological maturation, acquiring increased motility and fertilizing capacity in

Detailed Solution for Test: Gametogenesis (NCERT) - Question 8

 In the head of the epididymis, the sperms undergo physiological maturation, acquiring increased motility and fertilizing capacity.

Test: Gametogenesis (NCERT) - Question 9

Which one is released from the ovary?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 9

Female gamete is released from the ovary in the secondary oocyte stage by rupturing the wall of the ovary.

Test: Gametogenesis (NCERT) - Question 10

At what stage of life is oogenesis initiated in a humanfemale?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 10

Oogenesis is the process of formation of functional haploid ova from the diploid germinal cells in the ovary. Oogenesis begins during embryonic development but is completed only at puberty of the secondary oocyte with the sperm.

Test: Gametogenesis (NCERT) - Question 11

The given table shows differences between spermato genesis and spermiogenesis. Select the incorrect option.

Detailed Solution for Test: Gametogenesis (NCERT) - Question 11

Spermatogenesis involves conversion of a diploid structure (spermatogonia) into haploid structures (spermatozoa). Spermiogenesis changes a haploid structure (spermatid) into another haploid structure (spermatozoon).

Test: Gametogenesis (NCERT) - Question 12

The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is

Detailed Solution for Test: Gametogenesis (NCERT) - Question 12

In human males, the primordial germ cells divide mitotically and produce spermatogonia. Some of the spermatogonia grow into large primary spermatocytes. Each primary spermatocyte undergoes first maturation division which is a reductional (meiotic) one. Thus, the primary spermatocyte divides into two haploid daughter cells called secondary spermatocytes. Each secondary spermatocyte now undergoes second maturation division which is a mitotic one. Thus, each secondary spermatocyte gives rise to two spermatids that undergo transformation to form two sperms. Overall, two secondary spermatocytes give rise to four sperms.

Test: Gametogenesis (NCERT) - Question 13

During oogenesis, each diploid , primary oocyte produces

Detailed Solution for Test: Gametogenesis (NCERT) - Question 13

In human females, certain cells in the germinal epithelium divide by mitosis to produce a large number of oogonia (diploid). The oogonia multiply by mitotic divisions to form primary oocytes (diploid). Each primary oocyte undergoes two maturation divisions. In the first meiotic division the primary oocyte divides into two very unequal haploid daughter cells- a large secondary oocyte and a small first polar body. In the second maturation division (mitotic), the first polar body may divide to form two second polar bodies and the secondary oocyte divides to form two unequal daughter cells, a large ootid and a small polar body. The ootid grows into a haploid ovum. Thus, from one oogonium, one ovum and three polar bodies are formed.

So, the correct answer is 'One functional egg and three polar bodies'.

Test: Gametogenesis (NCERT) - Question 14

The middle piece of the sperm contains

Detailed Solution for Test: Gametogenesis (NCERT) - Question 14

The middle piece of sperm contains mitochondria coiled around the axial filament. They provide energy for the movement of the sperm.

Test: Gametogenesis (NCERT) - Question 15

Immediately after ovulation, the mammalian egg is covered by a membrane known as

Detailed Solution for Test: Gametogenesis (NCERT) - Question 15

Immediately after ovulation, the layer that forms around the ovum is called corona radiata. It is formed by the granulosa cells of cumulus oophorus. Corona radiata probably increases the likelihood that the ovum will be picked up in the uterine tube.

Test: Gametogenesis (NCERT) - Question 16

Which of the following is not an essential feature of sperms that determine the fertility of a male?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 16
  • Sperm count is essential as it determines the probability of a sperm encountering the egg.
  • Sperm motility is essential to ensure the passage of sperms through the genital tract, uterus and oviduct.
  • Sperm production rate determines the number of healthy coitus a male can have.
  • Sperm height is not a determining factor of fertility.
Test: Gametogenesis (NCERT) - Question 17

Spermatogenesis is induced by

Detailed Solution for Test: Gametogenesis (NCERT) - Question 17

FSH acts on the Sertoli cells and stimulate secretion of some factors which help in the process of spermatogenesis.

Test: Gametogenesis (NCERT) - Question 18

How many sperms are formed from 4 primary spermatocytes?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 18

One primary spermatocyte produces four spermatozoa, therefore, four primary spermatocytes will produce 16
spermatozoa.

Test: Gametogenesis (NCERT) - Question 19

Which of the following contains the actual genetic part of a sperm?

Detailed Solution for Test: Gametogenesis (NCERT) - Question 19

Head of the sperm is anterior, broad, flattened and oval structure. It consists of two parts, posterior large nucleus and anterior small cap-like acrosome. The nucleus consists of condensed DNA and basic proteins.

Test: Gametogenesis (NCERT) - Question 20

The major constituents of semen are _____ and _____

Detailed Solution for Test: Gametogenesis (NCERT) - Question 20

Sperms are released out from seminiferous tubules facilitated by seminal plasma composed of secretions from epididymis, vas deferens, seminal vesicle, and prostate.

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