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Class 10 Science — Control and coordination

Follow an impulse along a neuron and round a reflex arc, name what each region of the brain looks after, and tell a plant's tropic growth from an animal's hormone response.

Name: ________________________

  1. 1.Why is iodised salt worth using?

    • a) Iodine is the hormone that regulates blood sugar
    • b) The pituitary needs iodine to make growth hormone
    • c) Iodine replaces the salt lost in sweat
    • d) The thyroid gland needs iodine to make thyroxin

  2. 2.Adrenaline is released when an animal is frightened. Which set of changes follows?

    • a) The heart slows, blood goes to the digestive system, and breathing quietens
    • b) The heart beats faster, blood is diverted to the skeletal muscles, and breathing quickens
    • c) The heart beats faster and blood is diverted to the skin and gut
    • d) Breathing quickens and the skeletal muscles are cut off from blood

  3. 3.How does the movement of a touch-me-not leaf differ from a shoot bending towards light?

    • a) The leaf moves by growing on one side, and the shoot by losing water
    • b) The leaf moves because it has muscle tissue and the shoot does not
    • c) The leaf moves by cells gaining or losing water, with no growth involved
    • d) Both are growth movements, but the leaf's is faster

  4. 4.Match each plant hormone to what it does.

    • Auxin
    • Gibberellin
    • Cytokinin
    • Abscisic acid
    • Makes cells grow longer at the shoot tip
    • Promotes cell division
    • Inhibits growth
    • Helps the stem grow

  5. 5.Match each hormone to the gland that makes it.

    • Growth hormone
    • Thyroxin
    • Insulin
    • Adrenaline
    • Oestrogen
    • Testosterone
    • Ovaries
    • Thyroid gland
    • Pituitary gland
    • Pancreas
    • Adrenal gland
    • Testes

  6. 6.A shoot bends towards a window. Where has the auxin gone, and what has it done?

    • a) To the lit side, where it has made the cells grow longer
    • b) To the root, where it has made the root bend too
    • c) To the shady side, where it has stopped the cells growing
    • d) To the shady side, where it has made the cells grow longer

  7. 7.One neuron is drawn below. Tap the part along which the electrical impulse travels away from the cell body.

    Write the number of the part.

    123

  8. 8.Why is a reflex arc worth having, when the brain could give the same instruction?

    • a) The spinal cord is closer to the brain than the hand is
    • b) Reflex arcs use less energy than thinking does
    • c) The brain cannot reach the muscles of the hand
    • d) Thinking takes long enough that the damage would be done

Answer key — Class 10 Science — Control and coordination

  1. 1. d) The thyroid gland needs iodine to make thyroxin
  2. 2. b) The heart beats faster, blood is diverted to the skeletal muscles, and breathing quickens
  3. 3. c) The leaf moves by cells gaining or losing water, with no growth involved
  4. 4. Auxin → Makes cells grow longer at the shoot tip; Gibberellin → Helps the stem grow; Cytokinin → Promotes cell division; Abscisic acid → Inhibits growth
  5. 5. Growth hormone → Pituitary gland; Thyroxin → Thyroid gland; Insulin → Pancreas; Adrenaline → Adrenal gland; Oestrogen → Ovaries; Testosterone → Testes
  6. 6. d) To the shady side, where it has made the cells grow longer
  7. 7. 3 — The axon
  8. 8. d) Thinking takes long enough that the damage would be done