Question

when some gram seeds are put in beaker half filled with water some seeds starts floating on the surface of water why

Answer 1

many seeds don't contain air sacs inside them so they don't float
one which contains air sac only floats

Answer 2

When we put some gram seeds in beaker half filled with water , seeds which are healthy and good sink at the bottom of the water whereas the seeds which are unhealthy remains afloat. So that's why some seeds starts floating on the surface of water as they are unhealthy and not fit for sowing.

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