The Fundamental Unit of Life — Science STD 9 — Question

Nucleolemma is a part of:

The technique which is used to separate particles of a solid suspended in a liquid quickly is called:

1. Decantation.
2. Centrifugation.
3. Sedimentation.
4. Filtration.

Meristematic tissues lacks:

In addition to the cell membrane, there is an outer thick layer in cells of plants called as:

The amplitude of the vibration of an ordinary conversation between two persons is approximately:

A key of mechanical piano is first struck gently and then struck again but much harder this time. In the second case:

1. Sound will be louder but pitch will not be different.
2. Sound will be louder and the pitch will also be higher.
3. Sound will be luder but pitch will be lower.
4. Both loudness and pitch will remain unaffected.

Major component of the atmosphere on Venus and Mars planet is:

1. Carbon dioxide.
2. Oxygen.
3. Nitrogen.
4. Water vapours.

Which one of the following statement is correct in respect of fluids?

The atomic numbers of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is:

Which cell organelle plays a crucial role in detoxifying many poisons and drugs in a cell?