Movement in Plants

Q.

Any change in the environment, to which an organism responds is called ____.

1. stimulus

2. response

3. tropism

4. dominanace

Q.

What is negative phototropism?

Q. Thigmonasty refers to the nastic response of plant to ______.

1. water
2. light
3. gravity
4. touch

Q. Statement 1: The stimulus for the movement in Mimosa pudica is sunlight.

Statement 2: It is a growth independent movement.

1. Only statement 1 is correct.
2. Only statement 2 is correct.
3. Both the statements are correct.
4. Both the statements are incorrect.

Q. What are the internal stimuli for plant growth

Q.

A potted plant kept in a room tends to bend towards the direction of light. This movement is called

1. Geotropism

2. Phototropism

3. Hydrotropism

4. Photoperiodism

Q.

Give some examples of negative tropism and positive tropism

Give some examples of stimulus in plants and animals

Q.

When the leaves of a Mimosa pudica plant are touched with a finger, they fold up quickly. This is an example of :

(a) chemotropism

(b) thigmonasty

(c) photonasty

(d) thigmotropism

Q.

Question 17
The growth of tendril in pea plants is due to

(a) effect of light
(b) effect of gravity
(c) rapid cell divisions in tendrillar cells that are away from the support
(d) rapid cell divisions in tendrillar cells in contact with the support

Q. The leaves of Mimosa pudica fold up and droop when touched. This happens due to change in .

1. turgor pressure
2. root pressure
3. air pressure

Q. What kind of movement is displayed by the plants in the images?

1. Thigmotropic, Thigmonastic
2. Thigmonastic, Thigmotropic
3. Thigmotropic, Thigmotropic
4. Thigmonastic, Thigmonastic

Q. Identify the movement which is common in plants like pea, pumpkin and cucumber?

Q. What is phototropism in plants? [3 MARKS]

Q. Name one example of the movement of a plant part which is very quick and can be observed easily.

Q. Movement of plants in response to chemical stimuli is called ____________.

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

Q.

Match the following:

A	B
1.Sunflower	i. Chemotropism
2.Tree roots	ii. Hydrotropism
3.Tomato roots	iii.Phototropism
4.Roots away from acids	iv.Geotropism

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1. 1-ii, 2-iii, 3-iv, 4-i

2. 1-iii, 2-iv, 3-ii, 4-i

3. 1-iv, 2-i, 3-ii, 4-iii

4. 1-iv, 2-iii, 3-i, 4-ii

Q. Arrange the following activities in the order of decreasing speed in which they take place.

(i) Movement of mimosa when it is touched.
(ii) Movement of sunflower in response to day and night.
(iii) Growth-related movements of plants.

1. (ii) – (iii) – (i)
2. (i) – (ii) – (iii)
3. (iii) – (ii) - (i)
4. (iii) – (i) – (ii)

Q.

All living cells produce ethylene. But one of these tissues are known to produce more ethylene compared to others. Identify the tissue.

1. Epithelial tissue

2. Epidermal tissue

3. Meristematic tissue

4. Vascular tissue

Q. Which part of the plant exhibits negative phototropism?

1. Roots
2. Leaves
3. Flowers
4. Shoot tips

Q. Observe the experiment sets [A] and [B].
Observe the test tube A and B. From the list given below, choose the combination of response of shoot and root that are observed in B.
[A] [B]

1. Negative phototropism and positive geotropism
2. Only negative phototropism
3. Positive phototropism and negative geotropism
4. Positive phototropism and positive geotropism

Q. What are tropic movements or tropism in plants?

Q. What is phototropism in plants? [3 MARKS]

Q.

Plants show movements in response to light, gravitational force, water, touch, chemical and touch.

1. True

2. False

Q.

The ___ is generated through osmotically driven inflow of water into cells across a selectively permeable membrane.

1. Capilary pressure

2. Turgor pressure

3. Root pressure

4. Transpiration pull

Q.

Arrange the following activities in the order of the speed (fastest to slowest) in which they take place.
(i) Movement of mimosa when it is touched.
(ii) Movement of sunflower in response to day and night.
(iii) Growth – related movements of plants.

1. (ii) – (iii) – (i)

2. (i) – (ii) – (iii)

3. (iii) – (ii) - (i)

4. (iii) – (i) – (ii)

Q. Anthocyanin pigment occurs in

1. Chromoplasts
2. Cytoplasm
3. Amyloplasts
4. Cell sap

Q. Which one of the following pairs of vegetables is an example of homologous structures?

Q. Phenomenon of organisms having similar structure with a similar origin is

1. Mimicry
2. Analog
3. Homology
4. Both A and B

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.

The Mimosa exhibits closing movement when it is exposed to abiotic factors such as______ , protecting the plant from physical damage or desiccation.

1. Extreme Heat

2. Excessive Rain

3. Regular weather

4. clouds