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


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Biology
Germination of seed
Why do the roots always grow down and the stems grow up?
Changing flower
How does a fish respire? Why does it die when it is taken out of water?
Effect of coloured light on growth of the plant
What is haemoglobin, rbc and wbc ?
How does oxygen reach different part of the body ?
why does animals change colours?
Carrot top
What is the main function of the large hump on the back of a camel?
Thistle funnel experiment
why do leaves change colour in the fall ?
Animals and their young ones
Grassy brick
Nest of Ant
Why do tears form in eyes while cutting an onion?
Cactus experiment
Bats have eyes or not ?
How does food gets spoilt ?
Osmosis