_______ are embryos with a single cotyledon and ______ are embryos with two cotyledons.

The correct completion of the statement is that monocots are embryos with a single cotyledon, while dicots are embryos with two cotyledons. This distinction is fundamental in plant biology and helps in classifying flowering plants.

Monocots, or monocotyledons, are characterized by their single cotyledon, which is the first leaf that emerges from the seed during germination. This group includes plants like grasses, lilies, and orchids. The presence of a single cotyledon influences various aspects of their structure, including leaf venation, root systems, and floral patterns.

Dicots, or dicotyledons, on the other hand, possess two cotyledons, which means that they typically produce two initial leaves when they germinate. This group includes a wide variety of plants such as beans, roses, and sunflowers. The presence of two cotyledons is associated with different anatomical features compared to monocots, particularly in terms of leaf structure and flower part organization.

Understanding these terms is essential in plant science, as they form the basis for many classifications and characteristics associated with different plant groups, aiding in botany and agriculture studies.