CBSE  /  Class 10  /  Science  /  Control and Coordination

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

  • increase the length of cells
  • promote cell division
  • inhibit growth
  • promote growth of stem

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

  • Auxin
  • Gibberellins
  • Cytokinins
  • Abscisic acid

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

  • Adrenaline
  • Thyroxin
  • Auxin
  • Insulin

  • 4. 
    Choose the incorrect statement about insulin

  • Adrenaline : Pituitary gland
  • Testosterone : Testes
  • Estrogen : Ovary
  • Thyroxin : Thyroid gland

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

  • effect of light
  • effect of gravity
  • rapid cell divisions in tendrillar cells that are away from the support
  • rapid cell divisions in tendrillar cells in contact with the support

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

  • hydrotropism
  • chemotropism
  • geotropism
  • phototropism

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

  • phototropism
  • geotropism
  • chemotropism
  • hydrotropism

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

  • auxin
  • gibberellin
  • abscisic acid
  • cytokinin

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

  • Nerve impulse travels from dendritic end towards axonal end.
  • 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.
  • 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.
  • 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

  • medulla in fore brain
  • medulla in mid brain
  • medulla in hind brain
  • medulla in spinal cord
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