๐ Class 7 Science Curiosity – Chapter 10 Notes
๐ฟ Life Processes in Plants | Amresh Academy
๐ Introduction
๐ฑ 1. Plant Growth
๐ How Plants Grow:
- New leaves ๐ฟ
- New branches ๐ณ
- Increase in height ๐
- Thickening of stems
⚡ Essential Factors:
- ๐ง Water → absorbed by roots
- ☀️ Sunlight → provides energy
- ๐งช Nutrients → minerals from soil
๐ 2. Photosynthesis
๐ Definition:
๐ Process by which plants make food (glucose) using sunlight
๐ Requirements:
- ☀️ Sunlight
- ๐ Chlorophyll
- ๐ฌ️ Carbon dioxide (CO₂)
- ๐ง Water
๐ฆ Products:
- ๐ฌ Glucose → energy / stored as starch
- ๐ฌ️ Oxygen → released into air
๐ Word Equation:
๐ Carbon dioxide + Water → (Sunlight + Chlorophyll) → Glucose + Oxygen
๐ฟ Main Site:
๐ Leaves (food factories)
๐ Importance:
- Provides food ๐ฑ
- Releases oxygen ๐ฌ️
๐ 3. Role of Leaves
- Broad & flat → capture sunlight ☀️
- Contain chlorophyll
- Store food as starch
๐ฌ️ 4. Gas Exchange
๐ Stomata:
๐ Tiny pores on leaves
⚡ Functions:
- CO₂ enters for photosynthesis
- O₂ released
- Helps in respiration
๐ฐ 5. Transport in Plants
๐ฟ Xylem:
๐ฟ Phloem:
๐ Importance:
๐ Ensures proper distribution of nutrients
๐ฅ 6. Respiration in Plants
๐ Definition:
๐ Breakdown of glucose to release energy
⚡ Requirements:
- Glucose
- Oxygen
๐ฆ Products:
- Carbon dioxide
- Water
- Energy
๐ Equation:
๐ Glucose + Oxygen → Carbon dioxide + Water + Energy
๐ง Key Point:
๐ Occurs day and night
๐ 7. Importance of Plant Processes
๐ฑ Photosynthesis:
- Produces food
- Releases oxygen
๐ฅ Respiration:
- Provides energy
๐ฐ Transport:
- Distributes water & food
๐ฌ️ Gas Exchange:
- Maintains balance of gases
⚖️ Balance in Nature:
๐ Maintains CO₂ and O₂ levels
๐ Final Summary
๐ Plants perform important processes:
- Photosynthesis ๐
- Respiration ๐ฅ
- Transport ๐ฐ
- Gas exchange ๐ฌ️
๐ These processes help in:
- Plant survival ๐ฑ
- Environmental balance ๐
✨ Perfect for revision + exams + concept clarity ๐
