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A : Failure of testes to descend in...

A : Failure of testes to descend into the scrotum causes sterility in man .
R : Higher internal body temperature is not suitable for sperm development

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion then mark (2)

C

If Assertion is true statement but Reason is false then mark (3)

D

If both Assertion and Reason are false statement then Mark (4)

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Consider the following four statements and select the correct option stating which ones are true (T) and which ones are false (F). (i) The scrotum acts as a thermoregulator, maintaining the testes at a temperature 2^(@) lower than that of the body (ii) Corona radiate layer of the ovum prevents polyspermy. (iii) Middle part of ear is derived from the endoderms layer. (iv) The hormone, human chorionic gonadotropin facilitates parturition by softening the connective tissue of the public symphysis.

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Assertion : During embrynic stage testes descend down and at the time of birth , it comes into scrotum . Reason : Spermatogenesis process requires less than body temperature .

Name the hormone responsible for the descent of testes into scrotum. Why does the failure of this process result in sterility?

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AAKASH INSTITUTE ENGLISH-HUMAN REPRODUCTION-Assignment ( Section - D ) (Assertion - Reason Type Question ) (In the following question a statement of assertion (A) is followed by a statement of reason (R )
  1. A : Failure of testes to descend into the scrotum causes steri...

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  2. A : Middle piece of sperm is called powerhouse R : It contain...

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  3. A : Vaginal orifice is partially covered by a membrane called the...

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  4. A : The male urethra is longer than the female urethra R : I...

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  5. A : In human ovum is alecithal type. R : is is almost free of y...

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  6. A : Oxytocin acts on the uterine muscles and cause stronger uter...

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  7. [A] : In morula stage, cells divide without any increase in size. [R...

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  8. A : In frog gray cresent is formed during fertilization R : I...

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  9. A : If fertilization occurs the corpus luteum is rescued from r...

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  10. A : if both the ovaries are removed after the first trimester o...

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  11. A : placenta is connected to the embryo through an umbilical cor...

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  12. A : All copulations do not lead to fertilisation and pregnancy ....

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  13. A : Lack of menstruation may be indicative of pregnancy R : ...

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  14. A : LH acts on Sertolic cells for release of certain factors re...

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  15. A : The first sign of growing foetus may be noticed by listeni...

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  16. A: Leyding 's cells synthesise and secrete festicular hormones ca...

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  17. A : In spermatogenesis the first haploid forms are spermatids. R...

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  18. A : Presence or absence of hymen is not a reliable inducator of v...

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  19. A : After menopause the levels of blood gonadotropins will rise ...

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  20. A : The secretions of male accessory glands constitute the semi...

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