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


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Biology
Balsam plant experiment
Roots of Carrot
Thistle funnel experiment
Carrot top
Photosynthesis - how do plants make their own food
Nest of Ant
What is haemoglobin, rbc and wbc ?
Why do tears form in eyes while cutting an onion?
Osmosis
Why do the roots always grow down and the stems grow up?
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 ?
Germination of seed
Effect of coloured light on growth of the plant
Cactus experiment
Why does heart beats?
How does food gets spoilt ?
why do leaves change colour in the fall ?
Bats have eyes or not ?
why does animals change colours?