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


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Biology
Grassy brick
Growth of a potato plant
Roots of Carrot
Bats have eyes or not ?
How does oxygen reach different part of the body ?
Why do tears form in eyes while cutting an onion?
What is the main function of the large hump on the back of a camel?
How many bones and muscles are there in our body?
Germination of seed
Balsam plant experiment
Thistle funnel experiment
why does animals change colours?
What is haemoglobin, rbc and wbc ?
How does food gets spoilt ?
Crystal Culture
Why does heart beats?
Why do the roots always grow down and the stems grow up?
Cactus experiment
Carrot top
why do leaves change colour in the fall ?