Class 7 Science Chapter 1 – Short Questions

Short Answer Questions

 

1. What is the importance of nutrition for living organisms?

 

Answer:

• • Nutrition provides energy for daily activities, helps in growth and repair of body tissues, and boosts immunity. Without proper nutrition, living organisms cannot survive or function properly.

2. Differentiate between autotrophic and heterotrophic nutrition.

 

Answer:

• • Autotrophic nutrition: Organisms make their own food using sunlight, water, and carbon dioxide (e.g., plants).

  • Heterotrophic nutrition: Organisms depend on other organisms for food (e.g., animals and fungi).

3. What is the role of chlorophyll in photosynthesis?

 

Answer:

• • Chlorophyll is a green pigment in plant leaves that absorbs sunlight, which is necessary for converting water and carbon dioxide into food.

4. How do plants obtain water for photosynthesis?

 

Answer:

• • Plants absorb water from the soil through their roots, which is then transported to leaves through the stem.

5. Why do some plants feed on insects? Give an example.

 

Answer:

• • Some plants grow in soil that lacks nutrients like nitrogen, so they trap and digest insects to fulfill their nutritional needs. Example: Pitcher plant.

6. What are saprotrophic plants? Give an example.

 

Answer:

• • Saprotrophic plants absorb nutrients from dead and decaying matter. Example: Mushroom.

7. What are the conditions necessary for photosynthesis?

 

Answer:

• • The main conditions for photosynthesis are sunlight, chlorophyll, carbon dioxide, water, and the right temperature.