Title: Transport in Plants - Class 11 Biology Notes
I. Introduction to Transport in Plants
Definition and significance of transport in
... [Show More] plants.
Overview of the role of water, minerals, and nutrients in plant growth.
Basic terminology and key concepts in plant transport.
II. Plant Tissues Involved in Transport
Introduction to the types of plant tissues:
Xylem: Structure, components (tracheids and vessels), and their role in water and mineral transport.
Phloem: Structure, components (sieve tubes and companion cells), and their role in nutrient transport.
Parenchyma, collenchyma, and sclerenchyma tissues in plant structure.
III. Uptake and Transport of Water and Minerals
The process of water absorption by roots.
Root hair cells and their role in water uptake.
Movement of water and minerals through the root to the xylem.
Transpiration and root pressure as driving forces for water transport.
IV. Transpiration and Water Movement
Transpiration: The loss of water vapor from plant leaves.
Factors affecting transpiration rate: temperature, humidity, wind, and light.
The cohesion-tension theory and the role of adhesion and cohesion in water transport.
V. Long-Distance Transport of Organic Nutrients
Phloem transport: translocation of organic nutrients (sucrose and amino acids).
Mechanism of phloem loading, unloading, and pressure flow hypothesis.
Source-sink relationship and allocation of nutrients in the plant.
VI. Mineral Nutrient Uptake
The role of essential minerals in plant growth.
Mechanisms of mineral uptake by roots: active and passive transport.
The importance of mycorrhizal associations in nutrient absorption.
VII. Adaptations in Different Plant Types
Comparative study of transport adaptations in various plants:
Xerophytes (drought-resistant plants).
Hydrophytes (aquatic plants).
Halophytes (salt-tolerant plants).
VIII. Plant Hormones and Transport
The role of plant hormones (auxins, gibberellins, cytokinins) in transport and growth.
Phototropism and geotropism as examples of hormone-mediated responses.
IX. Environmental Factors and Plant Transport
The impact of environmental factors on plant transport:
Drought stress and its effect on water transport.
Nutrient deficiency and its implications for nutrient uptake. [Show Less]