For two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: a. Both A and R are true, and R is correct explanation of the assertion. b. Both A and R are true, but R is not the correct explanation of the assertion. c. A is true but R is false. d. A is false but R is true. Assertion: ln grasshoppers, females are hetero gametic and males are homo gametic. Reason: ln grasshoppers, male has only one sex chromosome (XO) whereas the female has sex chromosomes (XX).

What is excretion? How do unicellular organisms remove their wastes?

Updated 1/12/2026

Name two hormones secreted by pancreas. Write one function of each hormone named.

Updated 1/12/2026

For two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: a. Both A and R are true, and R is correct explanation of the assertion. b. Both A and R are true, but R is not the correct explanation of the assertion. c. A is true but R is false. d. A is false but R is true. Assertion: A child which has inherited X chromosome from father will develop into a girl child. Reason: Girl child inherits X chromosome from father and Y chromosome from mother.

Updated 1/12/2026

How do they take up carbon dioxide and perform photosynthesis?

Updated 1/12/2026

For two statements are given-one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: a. Both A and R are true, and R is correct explanation of the assertion. b. Both A and R are true, but R is not the correct explanation of the assertion. c. A is true but R is false. d. A is false but R is true. Assertion: Internal fertilisation occurs in mammals and birds. Reason: External fertilisation occurs in reptiles, amphibians, and fishes.

Updated 1/12/2026