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4. Plant Physiology

Plant physiology encompasses the essential functions and processes that allow plants to grow and reproduce. Key processes include the transport of water and minerals, photosynthesis for food production, respiration for energy release, and transpiration for water regulation. Various environmental factors impact these physiological activities, influencing plant health and development.

Sections

Plant Physiology

This section explores the essential physiological processes in plants including water transport, photosynthesis, respiration, and transpiration.

4 Section Overview

Start current section content and materials

4.1 Introduction

Plant physiology explores the essential functions necessary for the growth and reproduction of plants.

4.2 Transport in Plants

This section explains how plants transport water and minerals, discussing mechanisms such as root pressure and transpiration.

4.2.1 Movement of Water

This section addresses the essential processes of water absorption by roots and its subsequent movement through xylem vessels for plant survival.

4.2.2 Mechanism of Water Transport

The mechanism of water transport in plants involves root pressure, capillary action, and transpiration pull.

4.2.3 Mineral Transport

Mineral transport in plants involves the movement of essential minerals dissolved in water from the roots to various plant parts through the xylem.

4.3 Photosynthesis

Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen.

4.3.1 Definition

Photosynthesis is the process by which green plants synthesize food using sunlight, carbon dioxide, and water.

4.3.2 Photosynthetic Pigments

Photosynthetic pigments, primarily chlorophyll, are essential for capturing light energy during photosynthesis in plants.

4.3.3 Process of Photosynthesis

Photosynthesis is the green plants' process of converting sunlight, carbon dioxide, and water into glucose and oxygen through light-dependent and light-independent reactions.

4.4 Respiration in Plants

Plants respire to release energy from glucose, producing carbon dioxide and water in the presence of oxygen.

4.5 Transpiration

Transpiration is the process of water vapor loss from plants, mainly through stomata, which aids in cooling the plant and maintaining water flow.

4.6 Factors Affecting Photosynthesis and Transpiration

This section discusses the environmental factors that influence photosynthesis and transpiration in plants.

Learning Objectives

  • Plant physiology involves the processes that sustain life within plants.

  • Water and minerals are vital for plant survival and are transported via xylem.

  • Photosynthesis occurs using sunlight to convert carbon dioxide and water into glucose.

Key Concepts

Photosynthesis

The process by which green plants synthesize food (glucose) utilizing sunlight, carbon dioxide, and water.

Transpiration

The loss of water vapor from the aerial parts of plants, mainly through stomata, aiding in cooling and maintaining water flow.

Respiration

The metabolic process in which plants break down glucose in the presence of oxygen, producing carbon dioxide, water, and energy (ATP).

Xylem

Vascular tissue in plants responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.

Practice Exercises

Total Questions

2

Estimated Time

4 min

Passing Score

70%

Instructions

  • Read each question carefully
  • You can use hints if you need help
  • Complete all questions before submitting