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Boss quiz

10 questions on the whole topic. You get one try at each.

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  1. What is the food that a plant makes by photosynthesis?

    • Oxygen
    • Minerals
    • Glucose
    • Carbon dioxide

  2. Which two substances does a plant take in for photosynthesis?

    • Carbon dioxide and glucose
    • Oxygen and glucose
    • Oxygen and water
    • Carbon dioxide and water

  3. Where does the energy for photosynthesis come from?

    • Oxygen
    • Light
    • The soil
    • Water

  4. The white edges of these leaves make no starch. What are they missing?

    • Chlorophyll
    • Water
    • Stomata
    • Veins

  5. What colour does iodine solution go when starch is there?

    • Green
    • Orange-brown
    • Blue-black
    • Red

  6. In a dark room, a lamp is moved closer to some pondweed. Nothing else changes. What happens to the bubbles of oxygen?

    • The bubbles stop
    • There are fewer bubbles each minute
    • There are more bubbles each minute
    • The number stays the same

  7. What do stomata do?

    • Carry water up the stem
    • Let gases in and out of the leaf
    • Take in minerals from the soil
    • Absorb light

  8. How does the shape of a root hair cell help it?

    • It has a large surface area for taking in water
    • It can absorb more light
    • It makes the root waterproof
    • It stores more starch

  9. Which mineral does a plant need to make chlorophyll?

    • Magnesium
    • Nitrates
    • Carbon dioxide
    • Starch

  10. Why do animals depend on photosynthesis?

    • It keeps them warm at night
    • It gives them minerals to eat
    • It makes the carbon dioxide they breathe in
    • It makes their food and the oxygen they need
Answers
  1. Glucose. Glucose is a sugar. The plant uses it for energy and growth, or stores it as starch.
  2. Carbon dioxide and water. Carbon dioxide and water are the reactants. Glucose and oxygen are the products.
  3. Light. Chlorophyll absorbs light, and the energy is transferred from the light.
  4. Chlorophyll. Only the green parts have chlorophyll, so only they can photosynthesise.
  5. Blue-black. Iodine solution is orange-brown. It turns blue-black with starch.
  6. There are more bubbles each minute. More light reaches the pondweed, so it photosynthesises faster and gives out more oxygen.
  7. Let gases in and out of the leaf. Carbon dioxide diffuses in through the stomata. Oxygen and water vapour diffuse out.
  8. It has a large surface area for taking in water. The long, thin hair gives a large surface area, so water is taken in quickly.
  9. Magnesium. Magnesium is needed to make chlorophyll. Without it the leaves turn yellow. Nitrates are needed to make proteins.
  10. It makes their food and the oxygen they need. Every food chain starts with a producer, and photosynthesis puts oxygen into the air.