INTRODUCTION- CLASS 7 SCIENCE CHAPTER 1
अगर आप Class 7 Science Chapter 1 “Nutrition in Plants” के Important Questions and Answers खोज रहे हैं, तो यह पोस्ट आपके लिए बहुत helpful है।
इस chapter में पौधों के भोजन बनाने की प्रक्रिया, photosynthesis, chlorophyll तथा parasites जैसे topics को आसान भाषा में समझाया गया है।
Class 7
What is Nutrition? | पोषण क्या है?
Nutrition is the process by which living organisms obtain food and use it for growth and energy.
दूसरे शब्दों में, जीवित प्राणी भोजन प्राप्त करके उससे ऊर्जा लेते हैं और अपने शरीर का विकास करते हैं।
Plants prepare their own food by using sunlight, water, carbon dioxide and chlorophyll. Therefore, plants are called autotrophs.
Important Questions and Answers (CLASS 7 CH-01)
Q1. Why are plants called autotrophs?
Answer:
Plants are called autotrophs because they prepare their own food with the help of sunlight, water, carbon dioxide and chlorophyll through the process of photosynthesis.
हिंदी में:
पौधों को स्वपोषी (Autotrophs) कहा जाता है क्योंकि वे सूर्य के प्रकाश की सहायता से अपना भोजन स्वयं बनाते हैं।
Q2. What is photosynthesis?
Answer:
Photosynthesis is the process by which green plants prepare food using sunlight, water and carbon dioxide in the presence of chlorophyll.
6CO2+6H2Osunlight,chlorophyllC6H12O6+6O2
हिंदी में:
प्रकाश संश्लेषण वह प्रक्रिया है जिसमें हरे पौधे सूर्य के प्रकाश की सहायता से भोजन बनाते हैं।
Moreover, oxygen is released during this process, which is essential for life on Earth.
Q3. What are heterotrophs?
Answer:
Heterotrophs are organisms that cannot prepare their own food. Therefore, they depend on other organisms for nutrition.
Examples:
- Human beings
- Animals
- Fungi
हिंदी में:
जो जीव अपना भोजन स्वयं नहीं बना सकते, उन्हें परपोषी (Heterotrophs) कहते हैं।
Q4. Define chlorophyll.
Answer:
Chlorophyll is the green pigment present in leaves that helps plants absorb sunlight for photosynthesis.
हिंदी में:
क्लोरोफिल पत्तियों में पाया जाने वाला हरा रंगद्रव्य है जो सूर्य के प्रकाश को अवशोषित करता है।
Q5. What are stomata?
Answer:
Stomata are tiny pores present on the surface of leaves. They help in the exchange of gases.
हिंदी में:
स्टोमाटा पत्तियों की सतह पर मौजूद छोटे-छोटे छिद्र होते हैं जो गैसों के आदान-प्रदान में मदद करते हैं।
Q6. Name the nutrients required by plants.
Answer:
Plants require nutrients such as:
- Nitrogen
- Phosphorus
- Potassium
- Iron
- Magnesium
Therefore, farmers use fertilizers and manure to improve soil fertility.
Q7. What is symbiosis?
Answer:
Symbiosis is a relationship in which two organisms live together and help each other.
Example:
Lichen is formed by algae and fungi living together.
हिंदी में:
जब दो जीव साथ रहकर एक-दूसरे को लाभ पहुँचाते हैं, तो उसे सहजीवन कहते हैं।
Q8. What are insectivorous plants?
Answer:
Insectivorous plants are plants that trap and digest insects to obtain nutrients.
Examples:
- Pitcher plant
- Venus flytrap
However, these plants still perform photosynthesis.
Q9. Differentiate between autotrophs and heterotrophs.
| Autotrophs | Heterotrophs |
|---|---|
| Prepare their own food | Depend on others for food |
| Example: Green plants | Example: Animals |
| Use photosynthesis | Cannot perform photosynthesis |
Q10. Why do organisms need food?
Answer:
Organisms need food because it:
- Provides energy
- Helps in growth
- Repairs damaged tissues
- Protects from diseases
Therefore, food is essential for survival.
Short Notes for Quick Revision
🌿 Key Points of Nutrition in Plants
- Green plants prepare food by photosynthesis.
- Chlorophyll absorbs sunlight.
- Carbon dioxide enters through stomata.
- Oxygen is released during photosynthesis.
- Some plants depend on insects or other organisms for nutrition.
MCQs | Multiple Choice Questions
1. Which pigment is responsible for photosynthesis?
A. Hemoglobin
B. Chlorophyll
C. Melanin
D. Keratin
Answer:
✅ Chlorophyll
2. Which gas is released during photosynthesis?
A. Nitrogen
B. Oxygen
C. Hydrogen
D. Carbon dioxide
Answer:
✅ Oxygen
3. Which plant traps insects?
A. Rose
B. Mango
C. Pitcher plant
D. Neem
Answer:
✅ Pitcher plant
Conclusion
In conclusion, Class 7 Science Chapter 1 “Nutrition in Plants” is very important because it explains how plants prepare food and support life on Earth.
Furthermore, understanding photosynthesis helps students build a strong base for higher science classes.
Therefore, students should revise these important questions and answers regularly for better exam preparation.
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