Tissues — Science STD 9 — Question

The plant tissue which provides mechanical strength and consists of living cells, is

The reason for the necessity of irrigation in India is that _______:

In the stratified epithelium, the basement membrane is in contact with:

Growing different crops in the same field in a pre-planned succession, to improve the quality and quantity of the crop yield and maintain the fertility of soil is known as:

Natural system of classification employs:

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

The technique of growing two or more different crops together in the same field is known as:

Tissue that is absent in monocots is:

1. Chlorenchyma
2. Sclerenchyma
3. Arenchyma
4. Collenchyma

AIDS is due to:

1. Reduction to number of helper T-cells.
2. Reduction in number of killer T-cells.
3. Autoimmunity.
4. Non-production.

.......... are involved in intracellular digestion?

In angiosperms:

1. Xylem possess vessels.
2. Phloem has sieve tubes and companion.
3. Flowers are reproductive structures.
4. All the above.