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Year 11 Science — Life processes

Trace food through the human gut and blood round the double circulation, say where each digestive juice acts, and explain how a plant moves water up and sugar down.

Name: ________________________

  1. 1.Blood goes round and round, so pick a place to begin: starting from "The right atrium", put the stages of one full circuit in order.

    • The left ventricle
    • The right atrium
    • The lungs
    • The right ventricle
    • The rest of the body
    • The left atrium

  2. 2.Sugar made in the leaves is moved to the roots, fruits and growing buds through the phloem. What is this transport called? Answer with one word.

  3. 3.A stoma on the underside of a leaf is drawn below: two curved guard cells with a gap between them. Tap the pore that gases pass through.

    Write the number of the part.

    123

  4. 4.What are the villi of the small intestine for?

    • a) They increase the surface available for absorbing digested food
    • b) They push the food along by contracting
    • c) They grind the food into smaller pieces
    • d) They secrete hydrochloric acid

  5. 5.Match each stage in the break-down of glucose to what it produces.

    • The first step, taken in the cytoplasm
    • Fermentation in yeast
    • Break-down of pyruvate in the mitochondria
    • A muscle cell short of oxygen
    • Ethanol and carbon dioxide
    • Pyruvate
    • Carbon dioxide and water
    • Lactic acid

  6. 6.A fish opens and closes its mouth far more often in a minute than you breathe. Why?

    • a) A fish has smaller lungs than a human being
    • b) Water is heavier than air and moves more slowly
    • c) A fish needs more oxygen than a human being does
    • d) There is much less oxygen dissolved in water than there is in air

  7. 7.Put the parts of the alimentary canal in the order food passes through them, starting with "Mouth".

    • Stomach
    • Large intestine
    • Small intestine
    • Oesophagus
    • Anus
    • Mouth

  8. 8.Each kidney holds a great many filtration units, each one a cluster of thin-walled capillaries with a cup-shaped capsule collecting the filtrate. What is such a unit called? Answer with one word.

Answer key — Year 11 Science — Life processes

  1. 1. 1. The right atrium 2. The right ventricle 3. The lungs 4. The left atrium 5. The left ventricle 6. The rest of the body
  2. 2. translocation
  3. 3. 2 — The stomatal pore
  4. 4. a) They increase the surface available for absorbing digested food
  5. 5. The first step, taken in the cytoplasm → Pyruvate; Fermentation in yeast → Ethanol and carbon dioxide; Break-down of pyruvate in the mitochondria → Carbon dioxide and water; A muscle cell short of oxygen → Lactic acid
  6. 6. d) There is much less oxygen dissolved in water than there is in air
  7. 7. 1. Mouth 2. Oesophagus 3. Stomach 4. Small intestine 5. Large intestine 6. Anus
  8. 8. nephron