Improvement in Food Resources — Science STD 9 — Question

Endothelium of the inner surface of blood vessels in vertebrates is formed:

Actively dividing tissues are:

In the lung fishes, the heart is:

1. Single chambered.
2. Two chambered.
3. Three chambered.
4. Four chambered.

Air is:

1. Exhaustible resource.
2. Inexhaustible resource.
3. Perishable resource.
4. Both (b) and (c).

Plant length is increased by:

1. Apical meristems.
2. Lateral meristems.
3. Periblem.
4. Parenchyma.

Vegetables and fruits are good sources of:

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

Cnidaria is characterised by:

1. Nematoblasts.
2. Coelenteron.
3. Tissue level of organisation.
4. All the above.

Find out correct sentence:

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.