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


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Biology
Animals and their young ones
Why does heart beats?
Cactus experiment
Crystal Culture
Why do the roots always grow down and the stems grow up?
How does food gets spoilt ?
Bats have eyes or not ?
Osmosis
What is haemoglobin, rbc and wbc ?
Effect of coloured light on growth of the plant
Thistle funnel experiment
Balsam plant experiment
How does a fish respire? Why does it die when it is taken out of water?
Grassy brick
Carrot top
Changing flower
Why do tears form in eyes while cutting an onion?
How many bones and muscles are there in our body?
Roots of Carrot
why does animals change colours?