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[A] : Spermatogenesis occurs in the semi...

[A] : Spermatogenesis occurs in the seminiferous tubules of the testes which also produce testosterone in interstitial cells.
[R]: Testosterone maintains the secondary sex characteristics of males, such as low voice, facial hair and increased muscle strength.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

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The correct Answer is:
B
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[A] : [A]: Spennatogenesis occurs in the seminif erous tubules of the testes which also pro- duce testosterone in interstitial cells. [R]: Testosterone maintains the secondary sex characteristics of males, such as low voice, facial hair and increased muscle strength.

Read the following statements and find out the incorrect statements. a. Each testicular lobule contains one to three highly coiled seminiferous tubules in which sperm are produced. b. Each seminiferous tubule is lined on its inside by two types of cells called Leydig cells and Sertoli cells. c. The region outside the seminiferous tubules called interstitial space, contain small blood vessels and male germ cells (spermatogonia) which lead to sperm formation. d. In testis immunologically component cells are also present. e. The seminiferous tubules of the testis open into the rete testis through vasa efferentia.

Read the following statements about male reproductive system and identify the correct ones. I . The scrotum helps in maintaining the temperature ideal for spermatogenesis . II. The male germ cells present in the seminiferous tubules undergo mitotic division and lead to the formation of sperms . III . The bulbourethral glands secrete substances which help in lubricating the penis and these glands also help in formation of the ejaculatory duct. IV. The site of spermatogenesis are highly compartments of the testis .

Assertion : A male is found to be lacking facial hair and pubic hair. Reason : It is a case of hyposecretion of testosterone from Leydig's cells of testes.

Which of the following cells are responsible for the secretion of the hormone that stimulates muscular growth, growth of facial and axillary hair, aggressiveness, low pitch of voice, etc.in males?

Hormones have the following features: I. Adenophypophysis produces gonadotropins II. Besides sex cells , hormones are also produced by testis and ovary III. Testosterone is produced by Leydig cells IV. Estrogen is produced by the ovary Which of the above factors influence secondary sexual characters ?

Which of these plants is correctly matched with its reproductive characteristics ? (i) Sphagnum : Male sex organ called antheridium produce biflagellate antherozoids while the female sex organ called archesporium produces a single egg . (ii) sequoia : One of the megaspores enclosed within the megasporangium develops into a multicellular female gametophyte that bears two or more archegonia or female sex organs (iii) Wolffia : one of the male gametes fuses with the egg cell to from a zygote while the other male gamete fuses with the diploid secondary nucleus to produce the triploid primary endosperm nuclelus . (iv) polysiphonia . Sexual reproduction is oogamous with non-motile gametes and accompanied by complex post-fertilization developments

Read the given statements that define functions of a particular hormone. (i) Regulates the development, maturation and functions of epiddymis, vas deferens, seminal vesicle, prostrate gland, urethra, etc. (ii) Stimulates muscular growth of facial and ailiary hair, aggressiveness, low pitch of voice, etc. (iii) Stimulates spermatogenesis. (iv) Act on CNS and sexual behaviour (Libido). (v) Produce anabolic (synthetic) effect on protein and carbohydrate metablosim. (vi) The Leydig,s cells/intestitial cells (present in interbular space). Secrete this hormone under the influence of LH. Which of the following hormones is referred here?

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