The Fundamental Unit of Life — Science STD 9 — Question

Check dams help to reduce soil erosion as:

Epithelial tissue is found in:

Swim bladder is present in:

1. Bony fishes.
2. Cartilaginous fishes.
3. Toad.
4. Duck.

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

Living organisms are used in:

1. Organic manure.
2. Biofertilizers.
3. Natural insecticides.
4. Pesticides.

Sex organs are unicellular and non-jacketed in:

1. Algae.
2. Bryophytes.
3. Pteridophytes.
4. Gymnosperms.

Find out the correct sentence about manure.

1. Manure contains large quantities of organic matter and small quantities of nutrients.
2. It increases the water holding capacity of sandy soil.
3. It helps in draining out of excess of water from clayey soil.
4. Its excessive use pollutes environment because it is made of animal excretory waste.

1. (i) and (iii)
2. (i) and (iii)
3. (ii) and (iii)
4. (iii) and (iv)

Sun causes weathering of rocks through:

1. Mechanical force.
2. Physical phenomena.
3. Chemical changes.
4. Biological changes.

Most of the cells are ________ in size and are not visible to the unaided eye.

The jersey bull used for crossbreeding is exotic variety from: