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


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Biology
How does a fish respire? Why does it die when it is taken out of water?
Growth of a potato plant
Nest of Ant
Balsam plant experiment
Carrot top
Roots of Carrot
Why do tears form in eyes while cutting an onion?
What is haemoglobin, rbc and wbc ?
How many bones and muscles are there in our body?
How does food gets spoilt ?
Crystal Culture
Thistle funnel experiment
How does oxygen reach different part of the body ?
Changing flower
Grassy brick
Why do the roots always grow down and the stems grow up?
Animals and their young ones
Cactus experiment
why does animals change colours?
Effect of coloured light on growth of the plant