Environmental Balance - Standard 5 - Environmental Studies - Part 1 - Balbharati

Environmental Balance

Exercise

Q.1 What’s the solution?

We have to remove insects from the grain without using insecticides.

Ans. 1. Gather the grain.

2. Spread it out on a flat surface.

3. Pick out insects by hand.

4. Use a sieve to separate insects and dirt.

5. Let the grain dry in the sun.

6. Store the grain in a clean container.

Q.2 Use your brain power !

Make up a food chain :

Frog, kite, worm, snake, grass.

Ans. Grass - Worm - Kite - Frog - Snake.

Q.3 Answer the following questions.

(a) What is a food chain? Give an example of it.

Ans. A food chain is a way to show who eats whom in nature. It starts with plants, which make their own food. Then, animals that eat plants come next, and after that, other animals that eat those animals that eat plants. For example, in a forest, plants are eaten by rabbits, and then rabbits are eaten by foxes. This chain shows how energy and nutrients flow through the ecosystem.

(b) How is the balance in the environment maintained?

Ans. When the various cycles in the environment go on uninterrupted, the environmental balance gets maintained.

Q.4 What substances in the soil are useful for the growth of plants ?

Ans. Important substances in soil for plant growth:

1. Water: Essential for nutrient absorption and plant processes.

2. Nutrients: Nitrogen, Phosphorus, Potassium, and others.

3. Minerals: Provide support for plant roots.

4. Organic Matter: Provides nutrients and improves soil structure.

5. Air: Oxygen for root health and metabolism.

6. Microorganisms: Help with nutrient recycling and disease protection.

Q.5. True or false ?

(a) Micro - organisms form a part of the environment.

Ans. True.

(b) It is necessary to maintain biodiversity.

Ans. True.

(c) A grasshopper eats birds.

Ans. False.