← Back to the activity

Year 10 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.Why does a herbivore have a longer small intestine than a carnivore of the same size?

    • a) A longer intestine absorbs more water
    • b) Cellulose from grass takes longer to digest than meat does
    • c) Plants contain more protein than meat does
    • d) Herbivores eat less often

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

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

  3. 3.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
    • Carbon dioxide and water
    • Lactic acid
    • Ethanol and carbon dioxide
    • Pyruvate

  4. 4.Which pair of statements matches the two conducting tissues of a plant?

    • a) Xylem carries water and minerals up; phloem carries the products of photosynthesis both ways
    • b) Xylem carries sugar down; phloem carries water up
    • c) Xylem carries water and sugar; phloem carries minerals
    • d) Both carry water, xylem by day and phloem by night

  5. 5.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

  6. 6.Oxygen and carbon dioxide are carried round the body in different ways. Which description is right?

    • a) Oxygen is dissolved in the plasma; carbon dioxide is carried by haemoglobin
    • b) Both are mostly dissolved in the plasma
    • c) Oxygen is carried by haemoglobin in the red corpuscles; carbon dioxide is mostly dissolved in the plasma
    • d) Both are carried by haemoglobin in the red corpuscles

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

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

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

Answer key — Year 10 Science — Life processes

  1. 1. b) Cellulose from grass takes longer to digest than meat does
  2. 2. 1. Mouth 2. Oesophagus 3. Stomach 4. Small intestine 5. Large intestine 6. Anus
  3. 3. 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
  4. 4. a) Xylem carries water and minerals up; phloem carries the products of photosynthesis both ways
  5. 5. 2 — The stomatal pore
  6. 6. c) Oxygen is carried by haemoglobin in the red corpuscles; carbon dioxide is mostly dissolved in the plasma
  7. 7. b) There is much less oxygen dissolved in water than there is in air
  8. 8. 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