CBSE Class 10 Science Control and Coordination Quiz 2

1. The main function of abscisic acid in plants is to

A increase the length of cells B promote cell division C inhibit growth D promote growth of stem

2. Which of the following is not associated with growth of plant?

A Auxin B Gibberellins C Cytokinins D Abscisic acid

3. Iodine is necessary for the synthesis of which hormone?

A Adrenaline B Thyroxin C Auxin D Insulin

4. Choose the incorrect statement about insulin

A Adrenaline : Pituitary gland B Testosterone : Testes C Estrogen : Ovary D Thyroxin : Thyroid gland

5. The shape of guard cells changes due to change in the

A effect of light B effect of gravity C rapid cell divisions in tendrillar cells that are away from the support D rapid cell divisions in tendrillar cells in contact with the support

6. The growth of pollen tubes towards ovules is due to

A hydrotropism B chemotropism C geotropism D phototropism

7. The movement of sunflower in accordance with the path of Sun is due to

A phototropism B geotropism C chemotropism D hydrotropism

8. The substance that triggers the fall of mature leaves and fruits from plants is due to

A auxin B gibberellin C abscisic acid D cytokinin

9. Which of the following statements about transmission of nerve impulse is incorrect?

A Nerve impulse travels from dendritic end towards axonal end. B At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron. C The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron. D A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells.

10. Involuntary actions in the body are controlled by

A medulla in fore brain B medulla in mid brain C medulla in hind brain D medulla in spinal cord