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

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

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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Assertion: Spermatogenesis occurs in the seminiferous tubules and testosterone secretion takes place in the interstitial cells of the testes. Reason: Growth and maturation of secondary sex organs and the development of accessory sex characters are brought out by testosterone.

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.

(a) Write the correct sequence of accessory ducts in human testis after seminiferous tubules. (b) Fill in the blanks from Leydig cells, Sertoli cells, Spermatids, Spermatozoa: Castration of male cattle leads to destruction of _______ cells which secrete testosterone hormone.

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 ?

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 axillary 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?

TRUEMEN BIOLOGY ENGLISH-Animal Physiology -ASSERTION AND REASON
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  2. [A] : In Mammals sweat glands are primarily concerned with regulation...

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  3. [A] : [A]: Spermatogenesis occurs in the seminiferous tubules of the t...

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  4. Statememt 1 : In a Graafian follicle, the primary cell, the and the f...

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  5. [A] : Amniotic fluid serves as a protective cushion. [R]: It breaks...

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  6. [A]: Entry of sperm brings about a rearrangement of materials of cytop...

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  7. A : in morula stage the cells divide without any increase in siz...

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  8. [A]: Brain does not affect in the absence of glucose. [R]: Glucose ...

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  9. [A]: After operation, menstrual cycle in woman may be stopped. [R]...

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  10. Assertion : In placental mammals the placenta is connected to the e...

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  11. Assertion: Smaller the organism higher is the rate of metabolism per g...

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  12. [A] : Haversian canals are inter connecting canals that run usually lo...

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  13. [A]: Conjunctiva is composed of squamous epithelium and is continuous ...

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  14. [A]: During ovarian cycle follicles are con- trolled by gonadotropic h...

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  15. [A] : Hydrostatic pressure in blood forces water and other solutes of...

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  16. [A]: Emboly involves the invagination and involution through bottling ...

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  17. [A]: Each testis is attached to the abdominal wall by a ligament and u...

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  18. [A]: Taste buds are called the sense organs for olfaction [R]: Tas...

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  19. (A]: Little rotation and bending of the vertebral column is possible. ...

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  20. Assertion; Muscle as a whole does not obey All-or-none law. Reason...

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