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Year 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.Sort each directional growth by the stimulus it answers to.

    Groups: Phototropism · Geotropism · Chemotropism

    • A pollen tube growing towards an ovule
    • A shoot bending towards a window
    • A root turning downwards into the soil

  2. 2.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

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

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

  4. 4.Why is iodised salt worth using?

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

  5. 5.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) 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

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

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

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

  8. 8.Put the stages of an impulse travelling along one neuron in order, starting with "The dendritic tip picks the information up".

    • A chemical reaction there creates an electrical impulse
    • Chemicals released at the end cross the synapse
    • The impulse runs along the axon to its end
    • The impulse travels to the cell body
    • The dendritic tip picks the information up

Answer key — Year 10 Science — Control and coordination

  1. 1. A shoot bending towards a window → Phototropism; A root turning downwards into the soil → Geotropism; A pollen tube growing towards an ovule → Chemotropism
  2. 2. Thinking about what the senses report → Fore-brain; Riding a bicycle in a straight line → Cerebellum; Salivation and vomiting → Medulla
  3. 3. Growth hormone → Pituitary gland; Thyroxin → Thyroid gland; Insulin → Pancreas; Adrenaline → Adrenal gland; Oestrogen → Ovaries; Testosterone → Testes
  4. 4. b) The thyroid gland needs iodine to make thyroxin
  5. 5. a) The heart beats faster, blood is diverted to the skeletal muscles, and breathing quickens
  6. 6. c) To the shady side, where it has made the cells grow longer
  7. 7. b) The side touching the stick grows less rapidly than the side away from it
  8. 8. 1. The dendritic tip picks the information up 2. A chemical reaction there creates an electrical impulse 3. The impulse travels to the cell body 4. The impulse runs along the axon to its end 5. Chemicals released at the end cross the synapse