Tissues — Science STD 9 — Question

Which of the following is not an example of simple tissue in plants?

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.

A change in the physical state can be brought about:

Main difference between animal cell and plant cell is:

1. Nutrition.
2. Growth.
3. Movement.
4. Respiration.

Who is popularly known as ‘water man’?

1. Gajendra Singh.
2. Rajendra Singh.
3. Louis Pasteur.
4. Tansley.

A ball is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy when its reaches the maximum height?

Which of the following statement best describe frequency?

1. The maximum disturbance caused by a wave.
2. The number of complete vibrations per second.
3. The distance between one crest of a wave and the next one.
4. The distance travelled by a wave per second.

Physical quantity corresponding to the rate of change of displacement is:

Which of the following situations involves the Newton's second law of motion?

When a car driver travelling at a speed of 10m/s applies brakes and brings the car to rest in 20s, then retardation will be:

1. +2m/s²
2. -2m/s²
3. -0.5m/s²
4. +0.5m/s²