The Fundamental Unit of Life — Science STD 9 — Question

Green plants in an ecosystem are called:

1. Producers.
2. Consumers.
3. Decomposers.
4. None of the above.

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be:

1. W
2. X
3. Y
4. Z

The best evidence for the existence and movement of particles in liquids was provided by:

Centrosome occurs in:

The compounds synthesised near the ER are packaged and dispatched to various sites inside and outside the cell through:

A force is a result of:

The cation of an element has:

1. The same number of electrons as its neutral atom.
2. More electrons than a neutral atom.
3. Less protons than a neutral atom.
4. Less electrons than a neutral atom.

In case of negative work, the angle between the force and displacement is:

The sound waves travel fastest:

1. In solids.
2. In liquids.
3. In gases.
4. In vacuum.

All matter that is present in the universe has: