1. Why does a plant require nitrates?
- To form amino acids that form proteins of cells growth.
- To breathe.
- To grow.
- To photosynthesize.
1 of 13
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.