Question

In a velvet grass seed, the cotyledon is called:

• A. Scutellum
• B. Coleorrhiza
• C. Coleoptile
• D. Testa

Answer 1

The Correct Option is A

In a velvet grass seed, the cotyledon is called the "Scutellum." The scutellum is a specialized type of cotyledon found in monocotyledons, such as grasses. It plays a significant role in the nutrition of the germinating seedling.

The scutellum is not involved in photosynthesis but functions in absorbing stored food reserves from the endosperm and transferring them to the developing embryo. This adaptation is crucial for the seedling's initial growth and development, providing the necessary energy and nutrients.

Understanding these components:

• Scutellum: The correct term for the cotyledon in certain monocots like grasses, essential for nutrient absorption.
• Coleorrhiza: The protective sheath covering the radicle (embryonic root) within monocot seeds, aiding in root emergence.
• Coleoptile: The sheath protecting the shoot tip in grass seedlings as it pushes through the soil.
• Testa: The seed coat; a protective outer layer of a seed.

This understanding highlights why "Scutellum" is the correct answer.

Answer 2

In the seed of velvet grass (and other monocots like grasses), the cotyledon is modified and is known as the scutellum. The scutellum serves as a food storage organ that provides nourishment to the growing embryo during seed germination.

• Coleorrhiza refers to the protective sheath around the embryonic root in monocot seeds.
• Coleoptile is the protective covering that surrounds the shoot in monocots.
• Testa is the seed coat that provides protection to the seed.