What organs are secreted in the body of angiosperms? What types of underground shoot modifications are there?

What organs are secreted in the body of angiosperms? What types of underground shoot modifications are there? What is the difference between a rhizome and a root?

1) vegetative: root, shoot (stem, bud, leaf); generative; flower, seed, fruit;
2) tuber, rhizome, bulb, corm;
3} the rhizome (modified shoot) differs from the root by the presence of modified stem, buds and leaves, as well as by the absence of a root cap.

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