Vegetative propagation in Eicchornia and Pistia occurs by ________.
Offset
Understanding Vegetative Propagation in Eicchornia and Pistia
Vegetative propagation is a form of asexual reproduction in plants where new individuals are created from vegetative parts of the parent plant, such as roots, stems, or leaves. This process allows plants to reproduce quickly and maintain desirable traits of the parent plant.
The question asks about the specific method of vegetative propagation used by two common aquatic plants, Eicchornia (water hyacinth) and Pistia (water lettuce). These plants are known for their rapid spread, which is a result of their efficient vegetative propagation mechanism.
Vegetative Structures for Propagation
Let's look at the options provided and how they relate to plant propagation:
- Sticker: This term is not typically used to describe a natural method of vegetative propagation in plants. It might relate to grafting techniques or plant labeling, but not the reproductive structure in question.
- Offset: An offset is a short, thick, horizontal branch that grows from the base of a plant. It produces a new plantlet at its tip. Offsets are a common method of vegetative propagation in plants like succulents and also many aquatic plants.
- Runner: A runner, also called a stolon, is a slender, horizontal stem that grows along the surface of the ground. It has nodes from which new plants can arise. Strawberries are a classic example of plants that propagate via runners.
- Stolon: Stolon is often used interchangeably with runner, referring to a horizontal stem that grows along or just below the surface, giving rise to new plants at nodes or tips.
Vegetative Propagation by Offset in Eicchornia and Pistia
In the context of Eicchornia and Pistia, the vegetative propagation occurs specifically through offsets. These plants have a rosette of leaves and produce short, horizontal stems from the base. These short stems grow horizontally for a short distance and then terminate in a new rosette of leaves, forming a daughter plant. This connection between the parent plant and the daughter plant eventually breaks, allowing the new plant to become independent.
Think of it like a short side branch that quickly develops into a new, complete plant. This process allows Eicchornia and Pistia to multiply very rapidly, which is why they can quickly cover water bodies.
While runners/stolons are horizontal stems, an offset is often described as a shorter, stouter structure specifically found in plants with rosette habits, like Eicchornia and Pistia, where the horizontal growth quickly leads to a new plantlet close to the parent.
Comparing Offsets with Runners and Stolons
While both runners and stolons are forms of horizontal stems facilitating vegetative propagation, the term offset is specifically used for the short, thickened internode found in plants like Eicchornia and Pistia. Runners (stolons) typically have longer internodes and may root at multiple nodes along their length or just at the tip, while offsets are very short and directly give rise to a new plantlet at the end of the short horizontal stem.
Based on the characteristic vegetative structure and propagation method in Eicchornia and Pistia, the correct term among the given options is Offset.
| Structure | Description | Examples |
|---|---|---|
| Offset | Short, thick horizontal stem growing from the base, producing a new plantlet at the tip. | Eicchornia, Pistia, some succulents |
| Runner/Stolon | Slender, horizontal stem growing along or just below the surface, rooting at nodes/tip. | Strawberry, Grasses, Mint |
Revision Table: Vegetative Propagation Terms
| Term | Function in Propagation |
|---|---|
| Vegetative Propagation | Asexual reproduction from vegetative parts. |
| Offset | Short horizontal stem producing new plantlet. |
| Runner/Stolon | Horizontal stem spreading along surface, rooting at nodes. |
Additional Information: Types of Vegetative Structures
Besides offsets, runners, and stolons, plants use various other vegetative structures for propagation:
- Rhizome: An underground horizontal stem that produces shoots and roots from nodes (e.g., Ginger, Turmeric).
- Tuber: A swollen underground stem or root modified for storage and propagation (e.g., Potato - stem tuber, Sweet Potato - root tuber).
- Bulb: A short stem with fleshy leaves modified for storage, covered by scale leaves (e.g., Onion, Garlic, Tulip).
- Corm: A short, vertical, swollen underground stem used for storage and propagation (e.g., Colocasia, Crocus).
- Leaf Buds: Some plants can produce new plantlets from buds on their leaves (e.g., Bryophyllum).
Understanding these different structures helps in identifying how various plants reproduce asexually using their vegetative parts, ensuring the continuation of the species.
Important Questions from Reproduction in Organisms
The term "Clone" is used to describe the offspring that are:
The reproduction process in which only a single parent is involved is called _____.
In which of the following animals does internal fertilization take place?
- Syngamy led to formation of a specialized cell called-
Name a reproductive strategy in which parasites take advantage of the care of other individuals of the same species or different species to raise their young.
