Class 10 CH- 7 control and coordination HOTS QUESTIONS

MCQs (multiple choice questions)

  

Q.  Which of the following is not a plant hormone ?

a. Auxin

b. Ascorbic acid

c. Cytokinin

d. Abscisic acid

Ans.    (b) ascorbic acid.

Q. The plant part which exhibit -ve geotropism is:

a. Root

b. Stem

c. Branch 

d. Leaves

Ans.   (B)  STEM

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

a. photonasty

b. Hydrotropism

c. Phototropism

d. Chemotropism

Ans. C -phototropism.

Q. The plant hormone which triggers the fall of mature leaves and fruits from the plant body is :

a. Auxin

b. Gibberellin

c. Abscisic acid

d. Cytokinin

Ans   c- abscisic acid.

Q. Which of the following acts as a stimulus in the process of hydrotropism ?

a. Hydrocarbon.

b. Hydrogen oxide

c. HCL

d. Hydrogen peroxide.

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Ans.   B - hydrogen oxide

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HOTS ( HIGH ORDER THINKING SKILLS QUESTIONS ).

Que. The chemical substance P is made and secreted by the meristemetic tissues at the tip of stem of a plant. The chemical substance P is responsible for a phenomenon Q in plant in which the stem bends towards a source of light. The same chemical substance P has an opposite effect on root of a plant bend away from the source of the light in a process called R.

a. What is the chemical substance P ?

b. State whether P prefers to remains in the sunlight side of a stem or in shade.

c. What is the effects of substance P?

d. What is the name of process :

(i) Q, and (ii) R?

e. What is the general name of chemical substances like P? Name another substance which belongs to this class of chemical substances.