Multiple Choice QuestionsAssertion : Mammary glands are apocrine glands.
Reason : The distal part containing secretory granules break down and leaves as a secretion.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
How many sperms are formed from a secondary
spermatocyte
4
8
2
1
C.
2
At sexual maturity, the undifferentiated primordial germ cells divide several times by I mitosis to produce a large number of spermatogonia. Each spermatogonium actively grows to a larger primary spermatocyte. Each primary spermatocyte undergoes two successive divisions, called maturation divisions. The first maturation division is reductional or meiotic.
Hence, the primary spermatocyte divides into two haploid daughter cells called secondary spermatocytes. Both secondary spermatocytes now undergo second maturation division which is an ordinary mitotic division to form, four haploid spermatids. Thus each secondary spermatocyte gives rise to two spermatids that undergo transformation to form two sperms. Overall, both secondary spermatocytes give rise to four sperms.
Grey crescent is the area
at the point of entry of sperm into ovum
just opposite to the site of entry of sperm into ovum
at the animal pole
at the vegetal pole.
Assertion : Mammalian ova produces hyaluronidase.
Reason : The eggs of mammal are microlecithal and telolecithal.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Which of the following is true regarding sperm?
Fertilizin : for penetrating egg membrane
Hyalurodinase : for penetrating egg membrane
Acrosin : dissolves corona radiata
Capacitation : takes place in penis
Assertion: In mammals the female secondary sexual characters are developed by gonadotropins.
Reason: Gonadotropins are secreted by graafian follicle.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
A cross section at the midpoint of the middle piece of a human sperm will show
centriole, mitochondria and 9 + 2 arrangement of microtubules
centriole and mitochondria
mitochondria and 9 + 2 arrangement of microtubules
9 + 2 arrangement of microtubules only
Which one of the following events is correctly matched with the time period in a normal menstrual cycle?
Release of egg: 5th day
Endometrium regenerates: 5 - 10 days
Endometrium secretes nutrients for implantation : 11 - 18 days
Rise in progesterone level : 1 - 15 days
Both corpus luteum and macula lutea are
found in human ovaries
a source of hormones
characterized by a yellow colour
contributory in maintaining pregnancy
The phase of menstrual cycle in humans that last for 7 - 8 days, is:
follicular phase
ovulatory phase
luteal phase
menstruation
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