Growth Independent Movements

Q.

Which flower is known as the flower of god?

Q.

How do auxins promote growth of tendrils around a support?

Q.

What is Pulvinus in leaves? In which plants is it found? What are their functions?

Q.

What are tendrils? How do auxins promote the growth of a tendril around a support? Explain in simple words.

Q.

Why is the folding up of the leaves of a sensitive plant on touching with a finger, not a tropism?

Q.

Give two examples of turgor movements in plants.

Q.

(a) What is meant by nastic movements in plants ? Give one example of nastic movements in plants.

(b) What is the difference between photonasty and thigmonasty ?

Q. Bending of stem towards the sunlight in plants is due to:

1. Unequal distribution of auxins
2. Uniform occurrence of gibberellins
3. Inhibition of cytokinin synthesis
4. Unequal distribution of cytokinins and gibberellins

Q.

What is an induced movement?

Q.

Why is the closing of a dandelion flower at dusk (when it gets dark), not a tropism?

Q.

Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called :

(a) phototropism

(b) thigmonasty

(c) chemotropism

(d) photonasty

Q.

Leaves of the sensitive plant wilt and droop sown on a slight touch. What mechanism brings about this change?

Q.

(a) What does a Mimosa pudica plant do in response to touch? What is this phenomenon known as?

(b) What happens to the dandelion flower

(i) during daytime

(ii) at night?

What is this phenomenon known as?

Q.

Is ABA an auxin?

Q.

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

Q.

There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and drooop when touched with fingers or any other solid object.

(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.

(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.

(c) Name the phenomenon exhibited by the leaves of plant C.

(d) Name a plant whose leaves behave like those of plant C.

(e) Which plant / plants exhibit the phenomenon based on growth movements?

Q. How do plants feel pain? What do they do to overcome it?

Q.

Which of the following is a growth movement and which is not?

(a) folding up of leaves of the sensitive plant on touching with hand.

(b) folding up of petals of a dandelion flower when the light fades.

Q. Describe the various movements of plants giving suitable examples.

Q.

When the leaves of a sensitive plant are touched with a finger, they fold up and when the light fades at dusk, the petals of a dandelion flower close.

(a) State one way in which the above two processes are similar.

(b) State two ways in which the above two processes differ.

Q.

Which of the following is not caused by a growth movement?

(a) bending of the shoot of a plant in response to light

(b) closing up of leaves of a sensitive plant on touching with an object

(c) climbing up of a plant on an object by using tendrils

(d) movement of the root of a plant towards a source of water

Q.

One of the following is not caused by the growth-related movement of the concerned plant part. This is:

(a) phototropism

(b) photonasty

(c) thigmonasty

(d) thigmotropism

Q. Which of the following is called ‘Resurrection plant’?

1. Selaginella lepidophylla
2. Salvinia
3. None of these
4. Marsilea

Q. What is meant by control and coordination in plant

Q.

Differentiate between reflexive and emphatic pronoun

Q. Direction of nastic movements is independent of the stimulus's position. State true or false.

1. True
2. False

Q.

What is the scientific name of the sensitive plant?

Q.

Auxin causes:

1. Promotion of apical dominance

2. Formation of adventitious fruits.

3. Growth of fruits.

4. All of the choices are correct.

Q.

Which of the following are not tropisms?

(i) growing of pollen tube in response to a sugary substance

(ii) folding up of leaves of the sensitive plant in response to touch

(iii) the winding of tendril around a support in response to touch

(iv) opening up of the leaves of a daisy flower in response to light

(a) (i) and (ii)

(b) (ii) and (iii)

(c) (i) and (iv)

(d) (ii) and (iv)

Q.

When we touch the leaves of a touch-me-not plant, they begin to fold up and droop. What kind of movement is observed here?

1. Growth dependent

2. Growth independent

3. Directional movement

4. Touch independent