Summary: Life Processes in Plants - Class 7 PDF Download

The chapter on "Life Processes in Plants" explores the essential biological functions that sustain plant life, emphasizing the intricate mechanisms through which plants maintain homeostasis, grow, and reproduce. Understanding these processes is crucial for comprehending broader ecological and agricultural contexts.

Photosynthesis

Photosynthesis is the primary process by which plants convert light energy into chemical energy. This occurs in the chloroplasts, where chlorophyll captures sunlight, facilitating the conversion of carbon dioxide and water into glucose and oxygen. The overall equation can be summarized as:

• 6 CO₂ + 6 H₂O + light energy → C₆H₁₂O₆ + 6 O₂

The significance of this process extends beyond individual plants; it forms the foundation of food webs and is crucial for oxygen production in the atmosphere.

Respiration

Plant respiration involves the breakdown of glucose to release energy for cellular activities. This process occurs in mitochondria and can be summarized by the equation:

• C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O + energy (ATP)

Transpiration and Nutrient Transport

Transpiration is the process of water vapor loss from plant surfaces, primarily through stomata. This process not only aids in nutrient uptake from the soil but also helps regulate temperature and maintain turgor pressure within plant cells. Nutrient transport occurs via xylem and phloem, facilitating the movement of water, minerals, and organic compounds throughout the plant.

Understanding these life processes is vital for advancements in agriculture, conservation, and ecological management, highlighting the interconnectedness of plant health and environmental stability.