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31 Years NEET Previous Year Questions: Human Reproduction - 3 - NEET MCQ


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25 Questions MCQ Test - 31 Years NEET Previous Year Questions: Human Reproduction - 3

31 Years NEET Previous Year Questions: Human Reproduction - 3 for NEET 2024 is part of NEET preparation. The 31 Years NEET Previous Year Questions: Human Reproduction - 3 questions and answers have been prepared according to the NEET exam syllabus.The 31 Years NEET Previous Year Questions: Human Reproduction - 3 MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for 31 Years NEET Previous Year Questions: Human Reproduction - 3 below.
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31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 1

Human eggs are

[1989]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 1

Eggs are of 4 types regarding the amount of yolk present in them :
(i) Alecithal Egg : Almost free of yolk eg. most mammals like man.
(ii) Microlecithal Egg : Very small amount of yolk eg. Branchiostoma.
(iii) Mesolecithal Egg : Moderate amount of yolk eg. Frog’s egg
(iv) Macrolecithal Egg : Large amount of yolk eg. Reptiles, birds and egglaying mammals.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 2

Egg is liberated from ovary in

[1989]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 2

Oogonia is the immature female reproductive cell which migrates to the ovary during development of the baby mature to forms a primary oocyte. The primart oocyte arrests at prophase -1 of meiosis till the child reaches puberty. At puberty meiosis -1 end and the primary converts to secondary oocyte which is liberated from the ovary. Meiosis -2 ends when it fuses with the sperm and that’s when the egg becomes a mature ovum.

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31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 3

Gonads develop from embryonic

[1990]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 3

Ectoderm produces – Liver, Epidermis, glands, hair, nervous system etc.
Endoderm produces – Pancreas, lining of urinary bladder etc.
Mesoderm produces – Dermis, most muscles, Kidneys, Gonads etc.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 4

How many sperms are formed from a secondary spermatocyte?

[1990]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 4

These develop into mature spermatozoa, also known as sperm cells. Thus, the primary spermatocyte gives rise to two cells, the secondary spermatocytes, which in turn produce four spermatozoa.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 5

Fertilizins are emitted by

[1991, 97]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 5

A glycoprotein fertilizin (composed of monosaccharides and amino acids) is secreted by a mature egg. Penetrating sperm also has some proteinaceous substance on its surface called antifertilizin. Due to the interaction between fertilizin & antifertilizin, the sperm adheres to the egg.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 6

Freshly released human egg has

[1991]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 6

Human female has X X chromosomes. When eggs formed each egg carries 22 autosomes & one X chromosome. In human male each sperm carries 22 autosomes & either X or Y-chromosomes.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 7

Location and secretion of Leydig cells are

[1991]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 7

Interstitial cells = Leydig’s cells are present in testes and secrete male hormone testosterone.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 8

Middle piece of mammalian sperm possess

[1991]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 8

Middle piece of mammalian sperm possess mitochondria which are coiled around an axial filament called mitochondrial spiral. Mitochondria produce energy for the movement of sperm.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 9

Extrusion of second polar body from egg nucleus occurs

[1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 9

The entry of sperm stimulate the secondary oocyte to resume and complete the suspended meiosis II. This produces a haploid mature ovum and a second polar body. The second polar body and sperm tail immediately degenerate.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 10

Acrosome reaction in sperm is triggered by

[1993]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 10

The activated spermatozoan on reaching the egg plasma membrane, undergoes a number of changes in its acrosomal region. All these changes are collectively described under acrosome reaction. Acrosome reaction is calcium-dependent involving massive uptake of calcium with an efflux of hydrogen generating high pH and osmotic pressure, producing negative surface charge, and partial or total release of the acrosomal enzymes Calcium influx may activate phospholipase resulting in accumulation of unsaturated fatty acids and fusiogenic lysophospholipids contributing to
acrosome reaction.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 11

Extra - embryonic membranes of the mammalian embryo are derived from

[1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 11

Four extra-embryonic membranes are present in mammals which originally arise from trophoblast viz. amnion, chorion, allantois and yolk sac. The trophoblast is the outermost layer of cells in morula.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 12

At the end of first meiotic division, male sperm differentiates into

[1994]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 12

After first meiotic division primary spermatocyte (diploid) gives rise to two secondary spermatocytes (haploid).

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 13

In 28 day human ovarian cycle, ovulation occurs on

[1994, 97]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 13

The 28 days human ovarian cycle is called menstrual cycle. On 14th day a mature ovarian follicle leaves ovary & comes into  the fallopian tube.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 14

The estrous cycle is a characteristic of

[1995]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 14

Estrous cycle is the characteristic of mammalian females other than primates. It is due to estrogen hormone. Estrous is the period during which ovulation occurs and the females mate with male.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 15

Test tube baby is one who

[1996, 2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 15

In test tube baby, fertilization of the sperm and the ova  is carried out in lab conditions (in vitro) and when the embryos have reached the 32-celled stage, it is implanted back into the uterus of the mother.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 16

Amniocentesis is a technique

[1997]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 16

Amniocentesis is the most widely used method for prenatal detection of many genetic disorders. It is also a technique used for determining the sex of the foetus. 

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 17

After ovulation the collapsed ovarian follicle shrinks and becomes filled with cell to form

[1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 17

After  ovulation ovarian follicle, undergo several stages of degeneration the pilicular cells inlarge and fill with a yellow fluid to form corpus luteum.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 18

The growth of corpus luteum is initiated by

 [1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 18

Luteinizing hormone causes ovulation. The remaining cells of ovarian follicle are stimulated by LH to develop corpus luteum.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 19

Exponential growth of cells is a characteristic feature of

[1999]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 19

Cells in culture usually follow a standard growth pattern. The first phase of growth after the culture is seeded is the lag phase, which is a period of slow growth when the cells are adapting to the culture environment. The lag phase is followed by the log phase (logarithmic phase), a period where the cells divide exponentially and consume the nutrients in the growth medium. When all the growth medium is spent (one or more of the nutrients is depleted) or when the cells occupy all of the available substrates, the cells enter the stationary phase.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 20

The shared terminal duct of the reproductive and urinary system in the human male is:

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 20

Urethra is a tube that connects the urinary bladder to the genitals for the removal of fluids from the body. The urethra travels through the penis, and carries semen as well as urine. 

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 21

During embryonic development, the establishment of polarity along anterior/ posterior, dorsal/ventral or medial/lateral axis is called

[2003]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 21

During embryonic development, the establishment of polarity along anterior/ posterior, dorsal/ventral or medial/lateral axis is called as organizer phenomenon. It is a region of a developing embryo or a substance produced by such a region that is capable inducing a specific type of development in undifferentiated tissue.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 22

If mammalian ovum fails to get fertilized, which one of the following is unlikely?

[2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 22

Since corpus luteum degenerates so progesterone also decreases rapidly (progesterone is essential for maintenance of pregnancy).

Also estrogen continues to curve growth of the endometrium which ultimately becomes thick enough to break down and cause menstruation. Hence choice (c) is unlikely as estrogen secretion does not decreases further.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 23

Grey crescent is the area

[2005]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 23

On the surface of the egg opposite to  the point of sperm entry, the peripheral area of the egg becomes lighter in colour and assumes a grey appearance. This area is crescentric in shape and is known as the grey crescent.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 24

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

[2006]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 24

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.

31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 25

In the human female, menstruation can be deferred by the administration of

[2007]

Detailed Solution for 31 Years NEET Previous Year Questions: Human Reproduction - 3 - Question 25

When the production of progesterone and estrogen hormone stops in blood this leads to shed off the lying of uterine endometrium. Therefore, by supply of estrogen and progesterone the menstruation can be deferred.

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