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

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Roots of Carrot
Growth of a potato plant
Effect of coloured light on growth of the plant
Grassy brick
why does animals change colours?
Why does heart beats?
How many bones and muscles are there in our body?
How does a fish respire? Why does it die when it is taken out of water?
What is the main function of the large hump on the back of a camel?
why do leaves change colour in the fall ?
What is haemoglobin, rbc and wbc ?
Germination of seed
Why do tears form in eyes while cutting an onion?
Cactus experiment
How does food gets spoilt ?
Carrot top
Photosynthesis - how do plants make their own food
Changing flower
Nest of Ant