Nastic Movements

Q.

The non-directional movement in plant in response to stimulus.

Q.

What is unilateral growth ?

Which term is used against it?

Your Sincerely

ABHYODAYA

Q. What is Movement or growth of any part of the plant in response to an external stimulus is called as?

Q.

Differentiate between Stimulus and Response.

Q. Which of the following are characteristics of nastic movements?

1. Temporary and reversible
2. Slow action
3. Growth independent movements
4. Unidirectional response to stimulus

Q. Plant cells change their shape by increasing or decreasing the _________ concentration in them.

1. salt
2. water
3. gas
4. sugar

Q. Which of the following picture shows the growth independent movement?

1. 
2. 
3. 
4. 

Q.

Give the biological/technical term of the following:

The change in an organism resulting due to a stimulus

Q.

In the primitive earth, polymers such as proteins and nucleic acids in aqueous suspension formed spherical aggregates called ____.

1. eobionts

2. liposomes

3. coacervates

4. protonucleosomes

Q.

Gigantism is caused by hyperactivity of pituitary gland.

1. True
2. False

Q.

The tropic movements in a plant are in a ________ direction.

Q. Pick up the correct answer.
I) In tropic movements, there is a definite relationship between response and stimulus.
II) Stimulus acts on protoplasm from one direction only in tropic movements.
III) In nastic movement, there is no relation between response and direction of stimulus.
IV) Stimulus acts on protoplasm from all sides in nastic movements.

1. I and II are correct.
2. I, II and III are correct.
3. II, III and IV are correct.
4. All are correct.

Q. Peristome teeth of moss shows

1. Hydrochasy
2. Xerochasy
3. Hydrotropism
4. Chemotropism

Q. Nastic movements differ from tropic movements in being

1. Directional with respect to stimulus
2. Non-directional with respect to stimulus
3. Controlled by turgor pressure
4. Controlled by chemicals

Q. Consider the following phenomena:

1. Closing of leaves of touch-me-not plant on touching.
2. Growth of plants towards light.

Which of them is a response to stimulus?

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

Q. Question 19
The movement of sunflower in accordance with the path of the sun is due to

(a) phototropism
(b) geotropism
(c) chemotropism
(d) hydrotropism

Q. Classify the following movements as tropic or nastic movements:
i) Opening of flower
ii) Shoots moving towards light

Q.

growth of pollen tube towards ovule is called

Q.

Which of the following substances on the cell surface is responsible for cell to cell sensing function?

1. Specialized network of proteins

2. Lipids

3. Carbohydrates

4. Phospholipids

Q.

Response of a plant to the changing relative length of the day and night is called phototropism.

1. True

2. False

Q. What is muscle spindle in knee jerk reflex?

Q. What are nastic and curvature movements? Give one example of each.

Q. Movements of hair in Drosera is

1. Photonastic
2. Seismonastic
3. Thermonastic
4. Thigmonastic

Q. What is the type of movement that occurs during opening and closing of flowers?

1. Nastic movement
2. Tactic movement
3. Tropic movement
4. Nutation

Q. What are 'nastic' and 'curvature' movements? Give one example of each.

Q. Non-directional movement of a plant part with respect to stimulus is a

1. Tropic movement
2. Nastic
3. Both A and B
4. None of the above

Q. The best material for demonstrating streaming movements of protoplasm within living cells is

1. Staminal hairs of Tradescantia
2. Onion peelings
3. Pith cells
4. None of the above

Q. Zig-zag movement is

1. Hyponastic
2. Nutational
3. Both (A) and (B)
4. None of the above

Q. Growth of the stem is controlled by:

1. Cytokinin
2. Abscisic acid
3. Gibberellin
4. Auxin

Q. Antherozoids are attracted towards archegonia in a fern plant. The phenomenon is

1. Nyctinasty
2. Chemonasty
3. Thigmonasty
4. Seismonasty