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5: Gravity mysteries: Does life need gravity? Plants certainly do. Charles Darwin was the first western scientist to show that rooted plants have gravity sensors: plumb lines, effectively, that give them a sense of up or down. Turn a plant pot on its side and you'll find that the roots continue to grow towards the centre of the Earth. Grown in space, plants show disoriented roots that don't get the best access to nutrients and water. Poor starch production is one of a number of adverse effects of this. Some seeds grown in microgravity even produce plants in which the genes are expressed differently from normal. Animals suffer a raft of problems if they are deprived of gravity

5 of 7 in GRAVITY : The Mysterious Fundamental Force.

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