6 Questions
What is the primary driving force behind passive absorption in roots?
Concentration gradients
What is the effect of increased temperature on absorption in roots?
Increased metabolic rate and absorption
What is the role of root hairs in absorption?
To increase surface area for absorption and solubilize minerals
What is the primary mechanism regulating absorption in roots?
Hormonal regulation
What is the characteristic of Apparent Free Space (AFS) uptake?
Rapid, non-selective uptake of ions
What is the effect of high pH levels on absorption in roots?
Decreased availability and uptake of ions
Study Notes
Absorption by Roots
Mechanisms of Absorption
- Passive Absorption: movement of water and ions into the root through diffusion and osmosis, driven by concentration gradients
- Active Absorption: movement of ions against their concentration gradients, requiring energy from the plant
Factors Affecting Absorption
- Root Hair Structure: increased surface area for absorption
- Soil Water Potential: affects water availability and uptake
- Ion Concentration: affects ion uptake and absorption rates
- Temperature: influences metabolic rate and absorption
- pH: affects availability and uptake of ions
Types of Absorption
- Apparent Free Space (AFS) Uptake: rapid, non-selective uptake of ions into the root
- Donnan Free Space (DFS) Uptake: slower, selective uptake of ions into the root
Role of Root Hairs
- Increase Surface Area: for absorption and uptake
- Secretion of Organic Acids: to solubilize minerals and increase availability
- Production of Enzymes: to break down organic matter and increase nutrient availability
Regulation of Absorption
- Hormonal Regulation: plant hormones, such as auxins and cytokinins, regulate absorption and uptake
- Feedback Mechanisms: plants regulate absorption based on internal nutrient levels and availability
Learn about the mechanisms, factors, and types of absorption by plant roots, including passive and active absorption, root hair structure, and regulation of absorption. Understand how plants take in water and nutrients from the soil.
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