A Level Biology Practice Exam

What is a notable feature of dicotyledonous plants in relation to embryo development?

1. Single leaves during germination

2. Absence of seed coat

3. Two cotyledons serving as food stores

4. No regeneration after damage

The correct answer is: Two cotyledons serving as food stores

The notable feature of dicotyledonous plants in relation to embryo development is indeed the presence of two cotyledons that serve as food stores. During germination, these cotyledons provide essential nutrients to the developing seedling, supporting its early growth before it can begin photosynthesis and obtain energy from the environment. This feature is a defining characteristic of dicots, allowing them to establish themselves more effectively once they emerge from the soil. In contrast, the other options do not accurately describe features of dicotyledonous plants. For instance, single leaves during germination pertain to monocotyledons, which typically exhibit one cotyledon instead of two. The mention of an absence of seed coat is misleading, as dicot seeds do have a seed coat that protects the embryo until germination. Lastly, the notion that dicots do not regenerate after damage is incorrect, as many dicot species have robust mechanisms for regeneration and healing after injury.