Thigmotropism

Q.

The growth of tendrils in pea plants is due to

1. effect of light

2. effect of gravity

3. rapid cell divisions in tendrilled cells that are away from the support

4. rapid cell divisions in tendrilled cells in contact with the support

Q.

When tendrils come in contact with an object, they encircle it and wind around it. Why?

1. This phenomenon can’t be explained.

2. Tendrils depict a circular growth pattern.

3. The part of the tendril in contact with the object does not grow as rapidly as the part of the tendril away from the object.

4. The part of the tendril away from the object does not grow as rapidly as the part of the tendril in contact with the object.

Q.

The tropic movement that helps the climbing vines to find a suitable support is __________.

1. phototropism
2. geotropism
3. thigmotropism
4. chemotropism

Q. State whether the following statement is true or false.
Chemotropism and chemotaxis are both related to each other.

1. True
2. False

Q. A growing seedling is kept in the dark room. A burning candle is placed near it for a few days. The tip part of the seedling bends towards the burning candle. This is an example of __________

[Review question: Pg. No: 230]

1. Geotropism
2. Thigmotropism
3. Phototropism
4. Chemotropism