State the external features of the following bulb rhizome corms

Answer 1

Certainly! Here are the external features of bulbs, rhizomes, and corms:

Bulbs

1. Layers: Bulbs typically consist of layers of fleshy scales (modified leaves) that store nutrients.
2. Basal Plate: A flattened structure at the bottom from which roots grow.
3. Tunics: Many bulbs have a protective outer layer called the tunic, which can be dry and papery (like in onions) or fleshy (like in lilies).
4. Scales: Internal scales are present for nutrient storage, often visible when the bulb is cut.
5. Bud: A growing point or shoot emerges from the top of the bulb.

Rhizomes

1. Horizontal Growth: Rhizomes grow horizontally under or at the soil surface, producing new shoots and roots at intervals.
2. Nodes and Internodes: They have distinct nodes (from which shoots and roots arise) and internodes (the segments between nodes).
3. Storing Nutrients: They may be thickened to store nutrients, appearing swollen in certain species.
4. Buds: Buds can be present at the nodes that will develop into new shoot systems or flowering stems.

Corms

1. Basal Plate: Similar to bulbs, corms have a basal plate from which roots grow.
2. Solid Structure: Unlike bulbs, corms are solid and not layered; they store nutrients in a fleshy, swollen body.
3. Growing Point: A growing point (or bud) arises from the top which develops into a shoot.
4. Lifeless Skin: The outer surface is often covered in a dry, papery skin, which may serve as a protective layer.

Each of these structures serves as adaptations for storage and survival, allowing plants to survive adverse conditions and reproduce efficiently.