What is geographical isolation? (b) Illustrate formation of a species with the help of an example where individuals are very different from each other and are capable of reproduction among themselves.

Give one example of each of the characters that are inherited and the ones that are acquired in humans. Mention the difference between the inherited and the acquired characters.

Updated 1/17/2026

Name one sexually transmitted disease each caused by a bacterial infection and viral infection. How can they be prevented?

Updated 1/17/2026

Write the function of hormone thyroxine in our bodies.

Updated 1/17/2026

How do they take up carbon dioxide and perform photosynthesis?

Updated 1/17/2026

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: Seeds are matured ovules. Reason: The part of seed which contains stored food for baby plant is called cotyledon.

Updated 1/17/2026