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


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Biology
Why do tears form in eyes while cutting an onion?
What is haemoglobin, rbc and wbc ?
Thistle funnel experiment
Osmosis
Nest of Ant
Roots of Carrot
How does a fish respire? Why does it die when it is taken out of water?
Changing flower
Animals and their young ones
Effect of coloured light on growth of the plant
Why do the roots always grow down and the stems grow up?
Crystal Culture
Germination of seed
Balsam plant experiment
Photosynthesis - how do plants make their own food
Grassy brick
Carrot top
Cactus experiment
What is the main function of the large hump on the back of a camel?
why does animals change colours?