Tropism

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

Q.

The movement of pollen tube of angiosperms and gymnosperms towards the female gametophyte is an example of _______ movement.

1. chemotropic

2. geotropic

3. phototropic

4. hydrotropic

Q.

A particular plant hormone was used to increase the height of dwarf plants. Which hormone was it?

Q. Steroid hormones easily pass through the plasma membrane by simple diffusion because they

1. Are water soluble
2. Contain carbon and hydrogen
3. Enter through pores
4. Are lipid soluble

Q.

The movement of a part of a plant in the direction of light is known as:

1. Hydrotropism
2. All of these
3. Geotropism
4. Phototropism

Q. What would happen if gibberlin is added to rice seedling.

Q.

What is hydrotropism in plants?

1. Movement in response to water

2. Movement in response to light

3. Movement in response to gravity

4. None of these

Q.

Which of the following is the most studied form of gibberellic acid?

1. GA₁

2. GA₃

3. GA4

4. GA₂

Q.

The movement of tentacles in Drosera towards the source of nutrition is an example of:

1. Ethylene

2. Zeatin

3. GA

4. IAA

Q.

Which plant hormone inhibits growth?

Q.

See the picture below. Identify the scientific name of the plant and the type of movement it shows to stimuli of touch.

1. Mimosa sativum, chemotropism

2. Mimosa arenosa, geotropism

3. Mimosa laxiflora, phototropism

4. Mimosa pudica, thigmotropism

Q.

Which of the following plant hormones induce parthenocarpy?

1. Extrinsic factors only

2. Intrinsic factors only

3. Both extrinsic and intrinsic factors

4. Neither extrinsic nor intrinsic factors

Q.

Which of the following is a plant hormone with the same site of synthesis and as the site of action?

1. Cytokinin

2. Abscissic acid

3. Ethylene

4. Insulin

Q.

Which plant hormone copes with adverse environmental conditions?

Q.

The growth of a tendril in pea plants is due to

1. Effect of light

2. Effect of gravity

3. Effect of touch

4. Effect of water

Q.

The movement of stem against gravity is called__________.

1. Positive Geotropism

2. Positive Phototropism

3. Negative Phototropism

4. Negative Geotropism

Q. The growth of plant organs in response of chemicals.

Q.

What causes Tropic responses?

Q. Identify the part of the plant that shows positive geotropism.

1. 
2. 
3. 

Q.

Identify the tropic movement in the picture below:

1. Chemotrophic movement

2. Geotropic movement

3. Thigmotrophic movement

4. Both A and B

Q. The growth of pollen tube through the style of a flower is an example of ___________.​

Q.

What are plant hormones?

Q. helps plants to communicate among their different body parts for proper growth.

1. Root
2. Stem
3. Phytohormones
4. Nervous system

Q. Which one is an anti - transpirant hormone?

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

Q.

How does gibberellin help plants?? (3points).

Q. Match the following hormones to their site of synthesis.

1. Root tip
2. Ripening fruit
3. Shoot apex
4. Chloroplast

Q. The following picture shows positive .

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

Q.

Growth responses dependant on the direction of a stimulus are called ______

1. apical dominance

2. gravitropism

3. phototropism

4. tropism

Q. The movement of stem against gravity is called__________.

1. Positive Phototropism
2. Negative Phototropism
3. Negative Geotropism
4. Positive Geotropism

Q.

Briefly answer the following:

Explain chemotropism with an example.