PW Class 7 Science Notes Chapter 10: Life Processes in Plants

Understanding how different plant parts contribute to these processes helps explain how plants obtain and use the materials they need. The chapter also introduces the role of chlorophyll and stomata, along with the movement of water, minerals, and prepared food within the plant.

These notes by PW bring together the important definitions, functions, equations, and comparisons from the chapter. They can help Class 7 students revise key concepts and prepare for questions related to photosynthesis, transportation, and respiration.

What Are Life Processes in Plants?

Life Processes in Plants refer to the vital activities plants perform to survive and grow. These functions include food production, internal nutrient transport, and cellular energy release. Understanding these mechanisms helps students master plant biology foundations. These concise notes provide clarity for fast revision and exam preparation.

Food Factory – Leaf

Leaves act as the primary sites for food production in green plants. Their unique structure captures maximum sunlight for chemical reactions.

• Lamina: Broad, flat green surface of the leaf blade.

• Midrib: Central main vein providing structural support.

• Veins: Network of fine vessels carrying water and nutrients.

• Petiole: Thin stalk attaching the leaf blade to the stem.

• Chlorophyll: Green pigment that traps radiant solar energy.

Photosynthesis Process and Requirements

Photosynthesis is the process green plants use to synthesise food from raw materials.

Plants absorb carbon dioxide from the atmosphere through tiny pores called stomata. Roots absorb water and dissolved minerals from the soil. Sunlight powers the conversion of these compounds into glucose and oxygen.

Plant Transportation Systems

Vascular tissues move critical substances throughout the root, stem, and leaf networks.

Xylem vessels transport water and dissolved minerals upward from roots. Transpiration pull drives this continuous upward movement. Phloem tissues transport synthesised food from leaves to all non-photosynthesising parts.

Respiration in Plant Cells

Respiration is the cellular process of breaking down glucose molecules to release usable energy.

Plants carry out respiration continuously during both day and night. Plant cells take in oxygen through stomata and release carbon dioxide as a byproduct.

Key Mechanisms in CBSE Class 7 Science Chapter 10

Plant survival depends on coordinated physical and chemical steps operating inside specialised tissues.

Photosynthetic Food Production Mechanism

Photosynthesis operates through sequential stages inside leaf cells to sustain plant life.

• Step 1: Chlorophyll pigments embedded in the leaf lamina trap sunlight energy.

• Step 2: Stomata take in carbon dioxide, while roots pull water through xylem via transpiration pull.

• Step 3: Chemical reactions convert water and carbon dioxide into glucose and release oxygen gas.

Life Processes in Plants Class 7 Notes PDF

The Life Processes in Plants Class 7 Notes PDF by PW covers the important concepts of leaf structure, photosynthesis, transportation of water and food through xylem and phloem, and respiration in plants. It provides concise explanations of the key terms, processes, functions, and differences included in the chapter.

Why Choose Life Processes in Plants Notes for Class 7?

Life Processes in Plants introduces different processes that help plants prepare food, move materials, and obtain energy. Notes can make these concepts easier to review by presenting the important information together.

1. Understand the Leaf as a Food Factory

Learn why the leaf is called the food factory of the plant and understand the role of chlorophyll in food preparation.

2. Learn the Parts of a Leaf

Revise the important parts of a leaf, including the lamina, midrib, veins, and petiole, along with their basic functions.

3. Revise Photosynthesis

Understand how green plants prepare food using water, carbon dioxide, sunlight, and chlorophyll, and learn about the products formed during the process.

4. Understand the Role of Stomata

Learn how stomata are involved in the entry and exchange of gases needed for processes such as photosynthesis and respiration.

5. Learn About Water and Mineral Transport

Understand how water absorbed by root hairs moves upward through the plant with the help of xylem and transpiration pull.

6. Differentiate Xylem and Phloem

Remember the functions of the two transport tissues: xylem carries water and minerals, while phloem carries prepared food.

7. Understand Food Transport

Learn how food prepared in the leaves is transported to different parts of the plant through phloem.

8. Revise Respiration in Plants

Understand respiration as the process of breaking down food to release energy and remember that plants respire during both day and night.

9. Learn the Respiration Equation

Revise the equation showing the breakdown of glucose in the presence of oxygen to form carbon dioxide, water, and energy.

10. Compare Photosynthesis and Respiration

Use the comparison to revise how photosynthesis and respiration differ in their functions, sunlight requirement, and gases released.

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