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


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Biology
Bats have eyes or not ?
why does animals change colours?
Why do the roots always grow down and the stems grow up?
How many bones and muscles are there in our body?
Cactus experiment
Photosynthesis - how do plants make their own food
why do leaves change colour in the fall ?
Carrot top
Why does heart beats?
Why do tears form in eyes while cutting an onion?
How does food gets spoilt ?
Roots of Carrot
What is the main function of the large hump on the back of a camel?
Effect of coloured light on growth of the plant
Nest of Ant
What is haemoglobin, rbc and wbc ?
Animals and their young ones
Crystal Culture
Osmosis
Germination of seed