A grain seed
The wheat grain as a seed is fitted for reproducing the plant from which it came. The germ is an embryo plant, with a radicle which can grow into a root system and a plumule which can develop into stems, leaves and ears. The pericarp is a tough skin which protects the inner seed from soil organisms which may attack it. The inner seed coats control the intake of water by the seed. The endosperm is the food reserve on which the young plant lives until it has developed a root system. If you look at wheat grains they appear as seeds, but a closer examination shows them to be true fruits. Each grain consists of a fruit-leaf with its edges rolled over and grown together, the furrow which runs the length of the grain being the line of joint.
We show a diagram of a wheat grain that has been cut in half length-wise through the furrow. The drawing shows the grain magnified over 70 times.

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