Cotyledons
Cotyledons
Cotyledons (pronunciation: /kɒtɪˈliːdən/) are a significant part of the embryo within the seed of a plant. Often when the seed germinates, or begins to grow, the cotyledon may become the first leaves of the seedling.
Etymology
The term "cotyledon" is derived from the Greek word "kotyledon," which means "cup-shaped hollow." It was first used in the 16th century to describe the first leaves of a seedling.
Types of Cotyledons
There are two types of cotyledons:
- Monocotyledons: These are plants that have one cotyledon in the seed. Examples include corn, wheat, and rice.
- Dicotyledons: These are plants that have two cotyledons in the seed. Examples include beans, peas, and lentils.
Function
Cotyledons serve a vital role in the life of a plant. They are responsible for absorbing nutrients from the seed until the plant can photosynthesize its own food. In some plants, cotyledons can also perform photosynthesis and create food for the plant.
Related Terms
- Embryo: The part of a seed or bud from which a plant grows.
- Seed: The small, hard part of a plant from which a new plant grows.
- Monocotyledons: Plants that have one cotyledon in the seed.
- Dicotyledons: Plants that have two cotyledons in the seed.
External links
- Medical encyclopedia article on Cotyledons
- Wikipedia's article - Cotyledons
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