Std 5 EVS 1 · Chapter 4
4. Environmental Balance
Complete solutions to the Exercise. Maharashtra State Board (Balbharati), Standard 5 EVS 1.
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Exercise
1What’s the solution?
We have to remove insects from the grain without using insecticides.
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.
2Use your brain power!
Make up a food chain:
Frog, kite, worm, snake, grass.
Grass → Worm → Frog → Snake → Kite
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3Answer the following questions.
(a) What is a food chain? Give an example of it.
A food chain shows how food and energy pass from one living organism to another. It usually begins with green plants, which make their own food. Animals that eat plants and animals that eat those animals come next.
Example: Grass → Grasshopper → Frog → Snake → Kite
(b) How is the balance in the environment maintained?
When the various cycles in the environment go on uninterrupted, the environmental balance is maintained.
4What substances in the soil are useful for the growth of plants?
WaterEssential for nutrient absorption and plant processes.
NutrientsNitrogen, phosphorus, potassium and other nutrients are needed for plant growth.
MineralsMinerals present in the soil support healthy plant growth.
Organic matterIt provides nutrients and improves soil structure.
AirOxygen in the soil is important for root health and metabolism.
Micro-organismsThey help in nutrient recycling and support healthy soil.
5True or false?
(a) Micro-organisms form a part of the environment.
True
(b) It is necessary to maintain biodiversity.
True
(c) A grasshopper eats birds.
False