Best NCERT Solutions for Class 10 Science Chapter 13 Our Environment

NCERT Solutions for Class 10 Science Chapter 13 – Our Environment

Best NCERT Solutions for Class 10 Science Chapter 13 Our Environment. Everything that is around us, both alive and non-living, is referred to as the environment. This includes the soil that sustains plant life, the water and air we consume, the numerous ecosystems that support a variety of life forms, and the air we breathe. Maintaining the delicate balance that sustains life on Earth and promoting a sustainable future require an understanding of our environment.

1. Why are some substances biodegradable and some non-biodegradable?

Answer: Biodegradable materials are those that microbes can break down and transform into simpler forms, while non-biodegradable materials are those that are incapable of breaking down into simpler forms through the action of microorganisms. Biodegradable materials include cotton, paper, vegetable waste, and so forth.

Conversely, non-biodegradable materials are those that are incapable of decaying due to the action of microorganisms or decomposers. Plastic, glass, polyethene, etc. are a few examples.

2. Give any two ways in which biodegradable substances would affect the environment.

Answer: There are two possible ways that perishable materials could impact the atmosphere:

-trash that decomposes readily and spontaneously into smaller pieces when exposed to natural elements such as water, oxygen, sunlight, or microbes is known as biodegradable trash.

-Pollution is a result of biodegradable trash because it smells bad.

3. Give any two ways in which non-biodegradable substances would affect the environment.

Answer: The following are some ways that non-biodegradable compounds impact the environment:

-They can’t be broken down by microbes, therefore they contaminate soil and water supplies.

– If stray animals inadvertently consume these materials, it will harm or maybe kill them.

NCERT Solutions for Class 10 Science Chapter 13 Our Environment

4. What are trophic levels? Give an example of a food chain and state the different trophic levels in it.

Answer: A food chain’s rungs are referred to as trophic levels.

Think about the following situation:

As an illustration:

Grass: Level I Trophic

Grasshopper: Level II Trophic

Trophic stage III frog

5. What is the role of decomposers in the ecosystem?

Answer: Decomposers consume dead and decaying materials. They aid in the restoration of the environment.

6. What is ozone and how does it affect any ecosystem?

Answer: One kind of oxygen is ozone, which is an oxygen-based gas. The molecular formula for ozone is 03. It is present at higher concentrations in the atmosphere. It keeps the earth from being exposed to the sun’s harmful UV radiation. Skin cancer, cataracts, and the destruction of plant and animal life have all been related to UV radiation.

7. How can you help in reducing the problems of waste disposal? Give any two methods.

Answer: The following actions can be performed to resolve the garbage disposal problem:

a. Try your best to reduce, reuse, and recycle.

b. Make use of clever garbage disposal strategies, such as using multiple trash cans for different kinds of waste.

NCERT Solutions for Class 10 Science Chapter 13 Our Environment

8. Which of the following groups contain only biodegradable items?

(a) Grass, flowers and leather

(b) Grass, wood and plastic

(c) Fruit-peels, cake and lime-juice

(d) Cake, wood and grass

Answer: (c) and (d)

9. Which of the following constitute a food chain?

(a) Grass, wheat and mango

(b) Grass, goat and human

(c) Goat, cow and elephant

(d) Grass, fish and goat

Answer: (b)

10. Which of the following are environmental-friendly practices?

(a) Carrying cloth-bags to put purchases in while shopping

(b) Switching off unnecessary lights and fans

(c) Walking to school instead of getting your mother to drop you on her scooter

(d) All of the above

Answer: (d)

11. What will happen if we kill all the organisms in one trophic level?

Answer: The flow of energy to the next trophic level will cease if we eliminate all organism in a level.

On one level, overcrowding will result from it. This would upset the balance of the food chain and lead to the ecosystem’s demise.

12. Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?

Answer: Yes, The effect of eliminating every organism at a given trophic level varies depending on the level. For instance, the ecosystem would collapse if producers were eliminated since herbivores would either be unable to subsist or would relocate. If herbivores are removed, producers would grow unfettered and predators would not receive food. Herbivore populations would rise to unsustainable heights and threaten to wipe out producers if carnivores were eliminated.

The removal of decomposers would lead to an accumulation of dead animals and pollution of the surrounding ecosystem. Furthermore, the absence of decomposition of deceased animals will result in a halt to the soil’s nutrient recycling and a decrease in fertility.

The earth’s green cover will disappear as a result. Therefore, creatures at every trophic level are required to preserve the ecosystem’s equilibrium.

NCERT Solutions for Class 10 Science Chapter 13 Our Environment

13. What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Answer: Biological amplification is the term used to describe the rise of dangerous chemical concentrations, such as pesticides, within the bodies of living things at every stage of the biological process involved in an organic phenomena.

Yes, as a result of the biological process level rising to the very best for the highest biological process level, there would be a rise in biomagnification levels. It could impact their natural processes, including as growth and replication.

14. What are the problems caused by the non-biodegradable wastes that we generate?

Answer: The issues brought on by the non-biodegradable trash we produce are as follows:

-They do not break down and collect in the environment.

-Biological amplification is caused by harmful non-biodegradable substances that penetrate the organic phenomenon.

-They pollute the soil, water, air, and land.

-The natural population of humans, animals, birds, and plants in space is suffering greatly from intense non-biodegradable pollutants if they are not addressed.

NCERT Solutions for Class 10 Science Chapter 13 Our Environment

15. If all the waste we generate is biodegradable, will this have no impact on the environment?

Answer: It is inevitable that an increase in the amount of perishable garbage will have an impact on the environment. Decomposers break down the excess perishable waste, releasing toxic greenhouse gases in the process. These gases have the potential to build up in the atmosphere and cause warming. Simply said, decomposers like bacteria and fungus recycle perishable trash.

The only detrimental effect on our environment will be that some of the chemicals released during the decomposition process could cause global warming.

16. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

Answer: The ozone layer is the protecting layer of the earth against damaging sunlight. It is important for the protection of all living things as well as inanimate objects. A fractured layer will prevent any organism from surviving. The actions being done to minimise this harm are as follows.

-The use of automobiles must constantly be kept to a minimum.

-We must never support the use of fossil fuels.

-All manufacturing companies are today required to construct refrigerators free of CFCs everywhere in the world.