Question

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2.Human Reproduction

normal

$A$ : If both the ovaries are removed after the first trimester of pregnancy, still there would be normal growth of foetus.
$R$ : After first trimester placenta secretes sufficient progesterone

Assertion and Reason both are correct and also correct explantion.

Assertion and Reason both are correct but not explanation of assertion.

Assertion is correct, but Reason is incorrect.

Both Assertion and Reason are incorrect.

Solution

During first trimester, corpus luteum is responsible for secreting progesterone. If both ovaries are removed during first trimester, there will be abortion.

Std 12

Biology

When the cleavage furrow extends from animal pole to vegetal pole and does not bisects the egg equally into two blastomeres the plane of cleavage is

normal

$A$ : Leydig’s cells synthesise and secrete testicular hormones called androgens.
$R$ : Leydig’s cells are located between the Sertoli cells.

normal

Mammary glands are modified

normal

Meridional cleavage results in blastomeres numbering

normal

Difference between trachea and fallopian tube is

normal

$A$ : If both the ovaries are removed after the first trimester of pregnancy, still there would be normal growth of foetus. $R$ : After first trimester placenta secretes sufficient progesterone

Solution

Similar Questions

When the cleavage furrow extends from animal pole to vegetal pole and does not bisects the egg equally into two blastomeres the plane of cleavage is

$A$ : Leydig’s cells synthesise and secrete testicular hormones called androgens. $R$ : Leydig’s cells are located between the Sertoli cells.

Mammary glands are modified

Meridional cleavage results in blastomeres numbering

Difference between trachea and fallopian tube is

$A$ : If both the ovaries are removed after the first trimester of pregnancy, still there would be normal growth of foetus.
$R$ : After first trimester placenta secretes sufficient progesterone

$A$ : Leydig’s cells synthesise and secrete testicular hormones called androgens.
$R$ : Leydig’s cells are located between the Sertoli cells.