Question

Statement 1: Placenta is a special tissue embedded in the uterine wall for the nourishing the embryo.

Statement 2: Menstrual blood flow is a strong indication that the fertilisation of ovum has taken place.

• A. Only statement 1 is correct
• B. Only statement 2 is correct
• C. Both the statements are correct
• D. Both the statements are incorrect

Answer 1

The correct option is A Only statement 1 is correct

$\bullet$ Placenta is a tissue embedded in the uterine wall. It allows the transfer of oxygen and nutrients such as glucose, vitamins, and amino acids from the mother to the growing embryo through the process of diffusion. It also allows carbon dioxide and waste products to diffuse from the embryo to the mother's blood. In this way it nourishes the embryo.
$\bullet$ If fertilisation does not take place, the innermost lining of the uterus, which would otherwise nourish the embryo, sheds off. The lining breaks off and comes out through the vagina as blood and mucous. This is known as menstruation.