Science 3rd grade | UNIT 1: Looking after plants 1.2 Plants need light and water
Sunil has an unhealthy plant.
What does a plant need to stay healthy and grow?
Activity 1.2a (Do plants need light to grow?)
You will need: six young plants - watering can - box to cover three plants
Look at the pictures to see what to do.
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Water all the plants every day. What do you predict will happen to the leaves, stems and roots of the plants? In this investigation both groups of plants are given water. What else do you need to keep the same to make this a fair test?
If plants do not get enough light and water the roots, stem or leaves, become unhealthy. The plant will wilt.
Light and water both help the plant to make food.
Activity 1.2b (Do plants need water to grow?)
You will need: nine young plants - watering can
Look at the pictures to see what to do.
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What do you predict will happen to the plants' leaves, stems and root in each case?
What do plants need to grow? How do you know? Explain what you have found out.
Questions
1 What does a plant need to grow and stay healthy?
2 Explain what happens to the stem and leaves when you put a plant in a dark place.
3 Would a plant grow if it was given juice instead of water? Draw a picture to show how you could investigate this.
