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

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

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

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

  3. 3.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

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

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

  5. 5.Sort each job by the part of the brain the chapter gives it to.

    Groups: Fore-brain · Cerebellum · Medulla

    • Salivation and vomiting
    • Thinking about what the senses report
    • Riding a bicycle in a straight line

  6. 6.A pea plant's tendril meets a stick and curls round it. What makes it curl?

    • a) The stick releases a hormone that pulls the tendril round
    • b) The side touching the stick grows less rapidly than the side away from it
    • c) The tendril's muscles contract on the side touching the stick
    • d) The tendril loses water on the side away from the stick

  7. 7.Why is iodised salt worth using?

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

  8. 8.What happens at the synapse between two neurons?

    • a) The electrical impulse jumps the gap unchanged
    • b) Chemicals released by the first cross the gap and start an impulse in the second
    • c) The two cells fuse so the impulse passes through
    • d) The impulse stops, and the second neuron starts a fresh one on its own

Answer key — Grade 10 Science — Control and coordination

  1. 1. a) The heart beats faster, blood is diverted to the skeletal muscles, and breathing quickens
  2. 2. d) The leaf moves by cells gaining or losing water, with no growth involved
  3. 3. 3 — The axon
  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. Thinking about what the senses report → Fore-brain; Riding a bicycle in a straight line → Cerebellum; Salivation and vomiting → Medulla
  6. 6. b) The side touching the stick grows less rapidly than the side away from it
  7. 7. c) The thyroid gland needs iodine to make thyroxin
  8. 8. b) Chemicals released by the first cross the gap and start an impulse in the second