The stalk of cereals, which holds the spike, is very thin and tall.

The stalk of cereals, which holds the spike, is very thin and tall. The ratio of thickness to height is 1: 500. Suggest an explanation for the existence of such amazing structures.

Natural selection assumes that the most efficient organism survives. Cereals needed to compete for light, so they tended to grow taller, and the most efficient stem shape is a tube, because it can hold a lot of spikelet weight.



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