Class 7 Science - Chapter 1 Notes
Chapter 1: Nutrition in Plants
1. **What is Nutrition?**
- Nutrition is the process by which living organisms obtain and utilize food for energy and growth.
2. **Types of Nutrition:**
- Autotrophic Nutrition: Organisms make their own food (e.g., plants).
- Heterotrophic Nutrition: Organisms depend on other organisms for food (e.g., animals, fungi).
3. **Photosynthesis:**
- The process by which green plants make food using sunlight, carbon dioxide, water, and chlorophyll.
- Equation: CO2 + H2O + Sunlight -> Glucose + O2
4. **Raw Materials for Photosynthesis:**
- Sunlight: Trapped by chlorophyll in leaves.
- Water: Absorbed by roots from the soil.
- Carbon dioxide: Taken in through stomata from the air.
5. **Other Modes of Nutrition in Plants:**
- Parasitic Plants (e.g., Cuscuta): Depend on other plants.
- Insectivorous Plants (e.g., Pitcher plant): Trap insects.
- Saprotrophic Plants (e.g., fungi): Feed on dead and decaying matter.
- Symbiotic Plants (e.g., Lichens): Mutual benefit relationship.
6. **Importance of Photosynthesis:**
- Provides food and oxygen to living beings.
- Maintains balance of oxygen and carbon dioxide in nature.
7. **Keywords:**
Chapter 1: Nutrition in Plants
1. **What is Nutrition?**
- Nutrition is the process by which living organisms obtain and utilize food for energy and growth.
2. **Types of Nutrition:**
- Autotrophic Nutrition: Organisms make their own food (e.g., plants).
- Heterotrophic Nutrition: Organisms depend on other organisms for food (e.g., animals, fungi).
3. **Photosynthesis:**
- The process by which green plants make food using sunlight, carbon dioxide, water, and chlorophyll.
- Equation: CO2 + H2O + Sunlight -> Glucose + O2
4. **Raw Materials for Photosynthesis:**
- Sunlight: Trapped by chlorophyll in leaves.
- Water: Absorbed by roots from the soil.
- Carbon dioxide: Taken in through stomata from the air.
5. **Other Modes of Nutrition in Plants:**
- Parasitic Plants (e.g., Cuscuta): Depend on other plants.
- Insectivorous Plants (e.g., Pitcher plant): Trap insects.
- Saprotrophic Plants (e.g., fungi): Feed on dead and decaying matter.
- Symbiotic Plants (e.g., Lichens): Mutual benefit relationship.
6. **Importance of Photosynthesis:**
- Provides food and oxygen to living beings.
- Maintains balance of oxygen and carbon dioxide in nature.
7. **Keywords:**
