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


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Biology
Why do the roots always grow down and the stems grow up?
What is the main function of the large hump on the back of a camel?
Cactus experiment
Roots of Carrot
Thistle funnel experiment
Animals and their young ones
Crystal Culture
why do leaves change colour in the fall ?
Photosynthesis - how do plants make their own food
Nest of Ant
Effect of coloured light on growth of the plant
How does food gets spoilt ?
why does animals change colours?
Bats have eyes or not ?
What is haemoglobin, rbc and wbc ?
Why does heart beats?
Balsam plant experiment
Growth of a potato plant
Changing flower
How does a fish respire? Why does it die when it is taken out of water?