Life Processes in Plants Class 7 Notes

Life Processes in Plants Class 7 Notes

Life Processes in Plants Class 7 Notes

1. Photosynthesis: The process by which green plants use sunlight, carbon dioxide (CO₂), and water (H₂O) to produce glucose (a type of sugar) and oxygen (O₂).
2. Stomata: Tiny pores located on the surface of leaves that facilitate the exchange of gases and water vapour.
3. Transpiration: The process through which water is released as vapour through stomata in the leaves.
4. Decolourisation: The process of removing colour from a leaf (often using alcohol) to prepare it for testing the presence of starch.
5. Bottle Garden: A closed ecosystem created by planting a plant in a sealed transparent bottle.
6. Starch: A type of carbohydrate
7. Chlorophyll: A green pigment found in green plants
8. De-starched: Process of removing the starch reserves from a part of a plant
9. Obliquely: Not in a direct way; indirectly
10. Phloem: Tissue in plants which transports food from the leaves
11. Xylem: Tissue in plants which transports water from the soil

1. Life Processes in Plants

1. Photosynthesis
2. Respiration
3. Transpiration
4. Reproduction
5. Growth

2. Photosynthesis

1. Process: Conversion of light energy into chemical energy.
2. Equation: Carbon dioxide + Water + Light Energy → Glucose + Oxygen
3. Importance: Produces food (glucose) and oxygen; essential for plant growth and energy.

3. Respiration

1. Process: Breakdown of glucose to release energy.
2. Equation: Glucose + Oxygen → Carbon dioxide + Water + Energy
3. Significance: Provides energy for growth, development, and other life processes.

4. Transpiration

1. Definition: The process of water vapour loss from plant leaves.
2. Importance: Helps in nutrient transport and cooling the plant

5. Transportation of Water and Nutrients

1. Xylem: Transports Water
2. Phloem: Transports Food

6. Role of Air in Plant Processes

1. Carbon dioxide: Essential for photosynthesis.
2. Oxygen: Produced during photosynthesis and used in respiration.

7. Interdependence of Photosynthesis and Respiration

1. Cycle: Oxygen produced is used in respiration,
2. Carbon dioxide produced is used in photosynthesis

8. Environmental Factors Affecting

Plant Processes

1. Light
2. Temperature
3. Water availability