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Why do the roots always grow down and the stems grow up?

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Photosynthesis - how do plants make their own food
Roots of Carrot
How many bones and muscles are there in our body?
Carrot top
Nest of Ant
Grassy brick
Bats have eyes or not ?
Thistle funnel experiment
Why does heart beats?
How does a fish respire? Why does it die when it is taken out of water?
How does oxygen reach different part of the body ?
How does food gets spoilt ?
Effect of coloured light on growth of the plant
why does animals change colours?
Balsam plant experiment
Germination of seed
Changing flower
Crystal Culture
Animals and their young ones