Which plants have seeds that contain two cotyledons?

The correct choice refers to dicotyledons, commonly known as dicots. In these plants, the seeds contain two cotyledons, which are the first leaves that develop from the seed. Each cotyledon serves as a food storage tissue that supports the young plant during germination before it can begin photosynthesis on its own.

Dicots are also characterized by other features, including the arrangement of vascular tissue, which is typically in a ring, and the presence of broad leaves with a network of veins. In contrast, monocots have only one cotyledon and exhibit different structural arrangements, such as parallel veins in their leaves and dispersed vascular bundles.

Pteridophytes and thallophytes represent other types of plant classifications. Pteridophytes, which include ferns, do not produce seeds at all, as they reproduce through spores. Thallophytes encompass non-flowering plants like algae and fungi, which also do not have seeds or cotyledons. Therefore, the unique feature of two cotyledons characteristic of dicots distinguishes them from the other plant groups.