9 Questions
Which process is involved in autotrophic nutrition in green plants?
Absorption of water and salts
How do higher green plants absorb water and mineral salts from the soil?
Through the root hairs
What is the structure of a root hair?
A single cell with cytoplasm, nucleus, and sap vacuole
How long does a root hair typically last?
A few days or weeks
Where are root hairs regenerated from?
The elongation zone of the root
Which of the following is the main function of root hairs?
To help the plant fix into the soil
Why are root hairs thin-walled?
To allow the passage of water and salts
What is the concentration of the solution inside a root hair's sap vacuole compared to the soil solution?
More concentrated
How do root hairs increase the surface area for absorption?
By increasing in number
Study Notes
Autotrophic Nutrition in Green Plants
- Autotrophic nutrition in green plants involves photosynthesis, where they produce their own food using sunlight, carbon dioxide, and water.
Water and Mineral Absorption in Higher Green Plants
- Higher green plants absorb water and mineral salts from the soil through their root system.
- The root system consists of primary roots, secondary roots, and root hairs.
Structure of a Root Hair
- A root hair is a long, thin extension of a root cell that increases the surface area for absorption.
- It has a thin, permeable cell wall that allows for the passage of water and minerals.
Root Hair Lifespan
- A root hair typically lasts for 2-3 weeks before it dies and is replaced by a new one.
Root Hair Regeneration
- Root hairs are regenerated from the root apex, which is the growing tip of the root.
Main Function of Root Hairs
- The main function of root hairs is to increase the surface area for absorption of water and mineral salts from the soil.
Characteristics of Root Hairs
- Root hairs are thin-walled to facilitate the passage of water and minerals into the root.
- The concentration of the solution inside a root hair's sap vacuole is hypotonic (less concentrated) compared to the soil solution, allowing for the absorption of water and minerals through osmosis.
Role of Root Hairs in Absorption
- Root hairs increase the surface area for absorption by providing a larger area in contact with the soil, allowing for more efficient absorption of water and minerals.
Test your knowledge on the process of autotrophic nutrition in green plants! Learn about the absorption of water and salts through root hairs and the crucial process of photosynthesis. Challenge yourself with this quiz and enhance your understanding of plant biology.
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