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Control and Coordination in Plants

Description: Control and Coordination in Plants
Number of Questions: 10
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Tags: Control and Coordination in Plants Coordination in Plants Coordination in plants
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Which of the following is promoted by abscisic acid?

  1. Flower initiation

  2. Stem elongation

  3. Detachment of leaves, fruits and flowers

  4. Bud formation


Correct Option: C
Explanation:

Detachment of leaves, fruits and flowers is promoted by abscisic acid.

The drooping or folding of legume leaves in the dark is called

  1. temporary wilting

  2. nyctinasty

  3. seismonasty

  4. permanent wilting


Correct Option: B
Explanation:

The drooping or folding of legume leaves in the dark is called nyctinasty.

Which of the following types of movement is shown by tendrils in response to touch?

  1. Phototropism

  2. Thigmotropism

  3. Thermotropism

  4. Geotropism


Correct Option: B
Explanation:

Thigmotropism is shown by tendrils in response to touch.

Which of the following hormones are involved in the delaying of leaf senescence?

  1. Auxins

  2. Cytokinins

  3. Gibberellins

  4. Abscisic acid


Correct Option: C
Explanation:

Gibberellins are involved in the delaying of leaf senescence.

Pneumatophores are

  1. positively geotropic

  2. plagio-geotropic

  3. diageotropic

  4. negatively geotropic


Correct Option: D
Explanation:

Pneumatophores are negatively geotropic.

Which of the following is a day-neutral plant?

  1. Tobacco

  2. Tomato

  3. Wheat

  4. Oat


Correct Option: B
Explanation:

Tomato is a day-neutral plant.

What do you call the movement of plant organs in response to water current?

  1. Rheotactic

  2. Anemotactic

  3. Galvanotactic

  4. Epitactic


Correct Option: A
Explanation:

Plant organs show rheotactic movement in response to water current.

Why does shoot of a plant bend towards light?

  1. Due to phototaxis

  2. Due to increase in auxin in its shaded area

  3. Due to presence of cells on the illuminated side

  4. Due to presence of gibberellin


Correct Option: B
Explanation:

Shoot of a plant bends towards light due to increase in auxin in the shaded area.

Indole acetic acid helps in the formation of

  1. roots

  2. stem

  3. fruit

  4. lateral bud


Correct Option: A
Explanation:

Indole acetic acid helps in the formation of roots.

Which of the following is a long-day plant?

  1. Rice

  2. Tomato

  3. Spinach

  4. Tobacco


Correct Option: C
Explanation:

Spinach is a long-day plant.

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