Monocots have only one cotyledon inside the seed coat. It is often only small because the endosperm to feed the new plant is not inside the cotyledon. For the RHS Level 2, you need to know about the internal structure of Zea Mays, maize, which is shown below.
Dicots have two cotyledons inside the seed coat. They are usually rounded and fat, because they contain the food store to feed the growing embryo. For the RHS Level 2 you need to know about the internal structure of Phaseolus vulgaris, (French bean), shown below, and Vicia faba (broad bean).
Phasolus vulgaris is shown below. You can find information on Vicia faba as well as several other seeds on this page.
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