Thigmotropism

Q.

The movement of plants in response to the stimulus of touch is called _____________.

1. thigmotropic movement

2. geotropic movement

3. phototropic movement

4. chemotropic movement

Q.

Give One Function Of Pneumatophores.

Q.

What is a tendril? Name the two types of tendrils. What does a tendril do in response to a touch of a support? What is this phenomenon known as?

Q. Why is raction favorable 2fe3+ +2i- = i2 + 2fe2+

Q.

What causes a tendril to encircle or coil around the object it comes in contact with? Explain the process involved.

Q.

The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :

(a) chemotropism

(b) nastic movement

(c) thigmotropism

(d) geotropism

Q.

P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.

(a) What is (i) R, and (ii) S?

(b) What is the name of growth movement exhibited by the organs R and S?

(c) Name the stimulus involved in this case.

(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.

(e) Name one plant like P and another plant like Q.

Q. Why do tendrils circle around a support provided?

Q.

The growth movement of a plant part in response to the touch of an object is called :

(a) thigmonasty

(b) hydrotropism

(c) thigmotropism

(d) geotropism

Q.

To which of the following directional stimulus roots of a plant do not respond?

(a) moisture

(b) candlelight

(c) touch

(d) gravity

Q.

The stimulus in the process of thigmotropism is :

(a) touch

(b) gravity

(c) light

(d) chemical

Q. 1.Define stimulus and response.
2. Since plant do not have a nervous system they do not show any kind of coordination. Do you agree with this statement? why or why not?

Q. Tropic movement is the movement of plant or parts of a plant in response to environmental stimuli.

1. non-directional
2. directional
3. diversional

Q. Plants with weak stems like in a cucumber and bitter gourd show

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

Q. (a) How is movement of leaves of touch-me-not plant and the movement of growth in stem towards light differ?
(b) Give a suitable example of chemotropism?

Q. Which of the following movements is not a directional movement?

1. The bending of the shoot of a plant in response to light
2. The closing up of leaves of a sensitive plant on being touched with an object
3. The climbing up of a plant on an object by using tendrils
4. The movement of the root of a plant towards a source of water

Q. What is phototropism?

Q.

Define the following :

1) Tropism 2) Hydrotropism 3) Stress hormone 4) Thigmotropism

Q. Nastic movements are non-directional movements in plants in response to stimuli.​

1. True
2. False

Q. Movement of a part of a plant in response to touch is known as .

1. hydrotropism
2. geotropism
3. thigmotropism

Q. The coiling of tendril around some support in response to touch is called as

1. Hydrotaxis
2. Chemotaxis
3. Thigmotropism
4. Thigmotaxis

Q. Cucurbitaceae is good example of

1. Haptotropism
2. Thigmotropism
3. Both (A) and (B)
4. None of the above

Q. Irritability/Reactivity/Sensitivity of a plant is

1. Response to stimulus in soil
2. Response to a change in environment
3. Movement caused by an external force
4. Ability to move

Q. The movement of shoot towards light is:

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

Q. To which of the following directional stimulus roots of a plant do not respond?
(a) moisture
(b) candle light
(c) touch
(d) gravity

Q. Tendrils exhibit/twining of tendrils is due to

1. Thigmotropism
2. Seismonasty
3. Heliotropism
4. Diageotropism

Q.

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

1. 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.

2. 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.

3. Tendrils depict a circular growth pattern.

4. This phenomenon can’t be explained.

Q. Tendrils and twiners come in contact with their support by means of

1. Nutation
2. Thigmotropism
3. Thigmonasty
4. Anemotropism

Q. Turgor movements occur in response to

1. Stimulation of amyloplasts
2. Activation and deactivation of phytochrome
3. Circadian rhythm
4. Changes in $K^{+}$ ion concentration

Q.

The movement of plant due to touch is called ___

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