Improvement in Food Resources — Science STD 9 — Question

When heated, molecules absorb ____ and their capacity to do ____ increases:

Who among the following is the father of Indian cytology?

A freely falling object travels 4.9m in 1st second, 14.7m in 2nd second, 24.5m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of:

The hardness of the bone tissue is due to the phosphates and carbonates of:

If the net force acting on a body is doubled, the acceleration of the body is:

Which of the following statements is incorrect:

The atomic theory of matter was proposed by:

1. John Kennedy.
2. Lavoisier.
3. Proust.
4. John Dalton.

Natural system of classification employs:

1. Compleify of cell structure.
2. Complexity of body structure.
3. Organisation.
4. All the above.

Which of the following represents a correct chemical formula?

1. CaCl
2. Na₃N
3. NaSO₄
4. NaS

Passage cells are present in: