An endospermous monocot seed is a seed where the endosperm is present and serves as the main storage tissue, and it belongs to monocot plants (like maize, wheat, or rice). The L.S. (Longitudinal Section) means a cut along the length of the seed to show internal structures. Here's a detailed explanation of its parts:

Key Components:

Seed Coat (Testa): The outer protective covering of the seed.
Endosperm: The nutritive tissue that stores food (e.g., starch, proteins) for the developing embryo. It occupies most of the seed's volume.
Embryo: The young plant that develops into a new organism. In monocots, it consists of:
- Cotyledon (Scutellum): A single, large cotyledon that absorbs nutrients from the endosperm.
- Plumule: The embryonic shoot that gives rise to the above-ground parts.
- Radicle: The embryonic root that develops into the root system.
- Coleoptile: A protective sheath covering the plumule.
- Coleorhiza: A protective sheath covering the radicle.
Hilum: The scar where the seed was attached to the fruit.
Micropyle: A small opening in the seed coat through which water enters during germination.

Sketch Description (Imaginary): Imagine a longitudinal section of a maize seed. The outer layer is the seed coat. Inside, the large endosperm occupies most space. The embryo is located at one end, with the scutellum adjacent to the endosperm, and the plumule and radicle protected by coleoptile and coleorhiza, respectively. Label all parts clearly.

Related Topics:

Seed Structure: Understanding the differences between monocot and dicot seeds, and endospermous vs. non-endospermous seeds.
Embryo Development: How the embryo forms and functions in plants.
Germination: The process where the seed develops into a new plant, utilizing stored food.

Formulae (Not applicable for this diagram-based question): This topic is more about anatomical structures rather than mathematical equations. Focus on labeling and functions.