Other questions in this quiz

2. What is the function of the Lower Epidermis

  • Cells towards the top of the leaf contain chloroplasts which allow maximum absorption of sunlight
  • Contain guard cells which regulate the opening and closing of the stomata.
  • Transparent to allow sunlight through to other layers.
  • Cells contain lots of air spaces which are connected to the stomata which allow optimum exchange of gases

3. Why does a plant require mineral ions?

  • To drink water.
  • To be healthy and grow properly.
  • To generate food.
  • To stay alive.

4. Describe an experiment to investigate photosynthesis, showing the evolution of oxygen from a water plant and the requirements of light.

  • ADDITIONAL - If you keep the apparatus in the dark, you may be able to collect a gas, but this gas will not relight a glowing splint because it isn't oxygen.
  • PART 2 - When the tube is full of gas, test for oxygen by putting a glowing splint quickly into the tube.
  • PART 1 - You will need a pondweed, beaker, glass tube and a light for this experiment. Firstly, place the pondweed in a flask. Place the light facing the pondweed which will then produce bubbles of oxygen.
  • PART 3 - If the splint relights, oxygen is present. This proves that oxygen is produced through photosynthesis.

5. How does light intensity affect the rate of photosynthesis?

  • The higher the light intensity, the higher the rate of photosynthesis however light intensity limits the rate of photosynthesis. After a while the light intensity has no further affect on the rate of photosynthesis
  • The higher the light intensity, the lower the rate of photosynthesis.
  • The lower the light intensity, the higher the rate of photosynthesis.
  • The lower the light intensity, the lower the rate of photosynthesis.

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