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

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Bats have eyes or not ?
why do leaves change colour in the fall ?
How does food gets spoilt ?
Effect of coloured light on growth of the plant
How does oxygen reach different part of the body ?
Thistle funnel experiment
Animals and their young ones
Grassy brick
What is haemoglobin, rbc and wbc ?
How many bones and muscles are there in our body?
Growth of a potato plant
why does animals change colours?
Balsam plant experiment
Germination of seed
Photosynthesis - how do plants make their own food
Roots of Carrot
Cactus experiment
Nest of Ant
What is the main function of the large hump on the back of a camel?