NCERT Solutions for Class 10 Biology Chapter 15 : Our Environment

Q: Question 1. What is biological magnification, and how does it work? Will there be varying levels of amplification at different layers of the ecosystem?

Answer. Biological amplification is defined as an increase in the concentration of hazardous chemical substances such as pesticides within the bodies of live organisms at each biological process level of organic phenomena. Yes, biomagnification levels would rise as the biological process level rose, and the very best for the highest biological process level would be achieved. It could affect their organic processes including growth, replication, and so on.

Q: Question 2. Will there be no environmental impact if all of the rubbish we produce is biodegradable?

Answer. If the amount of perishable waste increases, the extra perishable garbage will undoubtedly have an impact on the environment. Decomposers destroy the extra perishable trash, which subsequently emits dangerous greenhouse gases. These gases can build up in the atmosphere, causing global warming. Decomposers like bacteria and fungus simply recycle perishable waste. It will have such a negative impact on our environment that several of the chemicals released throughout the breakdown process may result in global warming.

Question 1

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

Medium

Solution

Verified by Toppr

Answer

Each step of a food chain is termed trophic level.
Grass

\to

Insect

\to

Frog

\to

Snake.
The above food chain has four trophic level :
(i) Grass (Producer)
(ii) Insect (Primary consumer)
(iii) Frog (Secondary consumer)
(iv) Snake (Tertiary consumer).

Answer

Each step of a food chain is termed trophic level.
Grass

\to

Insect

\to

Frog

\to

Snake.
The above food chain has four trophic level :
(i) Grass (Producer)
(ii) Insect (Primary consumer)
(iii) Frog (Secondary consumer)
(iv) Snake (Tertiary consumer).

Question 2

What is the role of decomposers in the ecosystem?

Medium

Solution

Verified by Toppr

Answer

Explanation

Various roles played by decomposers in the ecosystem are:

\to

They decompose biodegradable substances into useful substances.

\to

They release nutrients into the soil by decomposing dead and decaying matter, thus making the soil fertile.

\to

They maintain the nutrient pool by returning back the nutrients in the pool.

Answer

Explanation

Various roles played by decomposers in the ecosystem are:

\to

They decompose biodegradable substances into useful substances.

\to

They release nutrients into the soil by decomposing dead and decaying matter, thus making the soil fertile.

\to

They maintain the nutrient pool by returning back the nutrients in the pool.

Question 3

Why are some substance biodegradable and some non-biodegradable ?

Medium

Solution

Verified by Toppr

Answer

The main reason of a substance being biodegradable is being organic that can be used up by scavengers of environment. On the other hand some substances are non biodegradable because they are synthetic and cannot be decomposed by the microorganism.

Answer

The main reason of a substance being biodegradable is being organic that can be used up by scavengers of environment. On the other hand some substances are non biodegradable because they are synthetic and cannot be decomposed by the microorganism.

Question 4

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

Medium

Solution

Verified by Toppr

Answer

Biodegradable substances affect the environment in the following ways:

→→ Biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be used as humus after composting. This will enhance soil fertility.

→→ The biodegradable substances mainly contain carbon. These substances after decomposition release that carbon back into the atmosphere.

Answer

Biodegradable substances affect the environment in the following ways:

→→ Biodegradable substances such as tree leaves, plant parts, and kitchen wastes can be used as humus after composting. This will enhance soil fertility.

→→ The biodegradable substances mainly contain carbon. These substances after decomposition release that carbon back into the atmosphere.

Question 5

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

Medium

Solution

Verified by Toppr

Answer

Non-biodegradable substances affect the environment in the following ways:

→ They contaminate soil and water resources as they cannot be decomposed by micro-organisms.

→ These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.

Answer

Non-biodegradable substances affect the environment in the following ways:

→ They contaminate soil and water resources as they cannot be decomposed by micro-organisms.

→ These substances, when accidentally eaten by stray animals, can harm them and can even cause their death.

Question 6

What is ozone and how does it affect any ecosystem?

Medium

Solution

Verified by Toppr

Answer

Explanation-

The stratospheric layer of the atmosphere contains an ozone layer.
It acts as a protective shield to the earth from harmful UV- radiation.
Excess exposure to UV rays can lead to skin cancer and cataract.
Thus the presence of ozone layer is essential to block the entry of harmful UV rays.

Answer

Explanation-

The stratospheric layer of the atmosphere contains an ozone layer.
It acts as a protective shield to the earth from harmful UV- radiation.
Excess exposure to UV rays can lead to skin cancer and cataract.
Thus the presence of ozone layer is essential to block the entry of harmful UV rays.

Question 7

How can we help in reducing the problem of waste disposal? Suggest any three methods.

Medium

Solution

Verified by Toppr

Answer

We can reduce the problem of waste disposal by these methods-

By minimizing the use of disposable items and promoting the use of recycled articles.
Separating biodegradable and non-biodegradable waste before dumping them.
Recycling the non-biodegradable waste material.

Answer

We can reduce the problem of waste disposal by these methods-

By minimizing the use of disposable items and promoting the use of recycled articles.
Separating biodegradable and non-biodegradable waste before dumping them.
Recycling the non-biodegradable waste material.

Question 8

Which of the following groups contain only biodegradable items?

A

Glass, flowers and leather

B

Wood and grass

C

Fruit-peels, cake and lime-juice

D

Both B and C

Medium

Solution

Verified by Toppr

Answer

Wastes that are capable of being broken down or decomposed rapidly by the actions of microorganisms are called as biodegradable wastes. Fruit-peels, cake, lime juice, wood and grass can be easily decomposed by the microbes.

Answer

Wastes that are capable of being broken down or decomposed rapidly by the actions of microorganisms are called as biodegradable wastes. Fruit-peels, cake, lime juice, wood and grass can be easily decomposed by the microbes.

Question 9

Which of the following are environment-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 you mother to drop you on her scooter.

D

All of the above.

Medium

Solution

Verified by Toppr

Answer

Being eco-friendly or environmentally friendly means having a lifestyle that is better for the environment. It involves taking small steps towards the proper maintenance Earth's environment for the present and future generations.

Some of the actions that can be taken to ensure that include;

1. Avoiding the use of plastic bags encouraging the use of biodegradable bags (cloth, paper etc.)

2. Reuse of the plastic bottles and tin cans.

3. Taking up the public transportation or walking instead of using a private vehicle.

4. Segregation of biodegradable and non-biodegradable wastes.

5. Switching off fans and lights when not in use.

Answer

Being eco-friendly or environmentally friendly means having a lifestyle that is better for the environment. It involves taking small steps towards the proper maintenance Earth's environment for the present and future generations.

Some of the actions that can be taken to ensure that include;

1. Avoiding the use of plastic bags encouraging the use of biodegradable bags (cloth, paper etc.)

2. Reuse of the plastic bottles and tin cans.

3. Taking up the public transportation or walking instead of using a private vehicle.

4. Segregation of biodegradable and non-biodegradable wastes.

5. Switching off fans and lights when not in use.

NCERT Solutions for Class 10 Biology Chapter 15 : Our Environment

Access NCERT Solutions for Class 10 Biology Chapter 15 : Our Environment

NCERT Solutions for Class 10 Biology Chapter 15 : Our Environment

Our Environment Class 10 NCERT Solutions

Key Features of NCERT Solutions for Class 10 Science Chapter 15 - Our Environment

Frequently Asked Questions on NCERT Class 10 Biology Chapter 15 : Our Environment