NCERT Solutions For Class 10 Chapter 13

Q1:  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:

Biodegradable Substances: Those substances which are made up of organic matter ( plant and animal matter) and can be easily broken down by detritus organisms. For example Fruits, vegetables, leaves, paper, wood, etc. So, option a. (Grass, flowers, and leather) is correct. 

 Q2: Which of the following constitutes a food chain?

• (a) Grass, wheat, and mango
• (b) Grass, goat, and human
• (c) Goat, cow, and elephant
• (d) Grass, fish, and goat

Answer: 

The food chain is a sequence of events that are occurring in nature for the transfer of energy from one organism to another organism. Energy is transferred in the form of food. The sequence of the food chain starts from Producer (Autotrophs) then Primary Consumer (Herbivores) then the Secondary Consumer (Carnivores) and so on. So, option b. (Grass, goat, and human) is correct.

Q3: 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 your mother to drop you on her scooter
• (d) All of the above

Answer: 

Environment-friendly or eco-friendly means that live a lifestyle that is better for the environment. For example: Use biodegradable substances, reuse plastic items, switch off lights when not in use, etc. So, option d. is correct.

Q4: What will happen if we kill all the organisms at one trophic level?

Answer:

When all the organisms kill in one trophic level it creates an imbalance at the other trophic levels because the flow of food and energy will stop.

Q5: 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 impact of removing all the organisms in a trophic level is different for different trophic levels. For example, if producers are removed from the food chain then primary consumers will not get food, and so on. 

No, the organisms of any trophic level cannot be removed without causing any damage to the ecosystem. It will create an ecological imbalance and disturb the food web.

Q6: What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?

Answer:

Biological magnification is a phenomenon in which harmful chemicals enter into the food chain and the concentration of these chemicals increases at each trophic level. The magnification level is different for different trophic levels of the ecosystem. It reaches a maximum at the highest trophic level and reaches a minimum at the lowest trophic level.

Q7: What are the problems caused by the non-biodegradable wastes that we generate?

Answer:

Non- biodegradable wastes are non-degradable. These accumulate in the environment and are called biomagnification. Examples: pesticides, insecticides, etc. Non-biodegradable wastes cause Air pollution, water pollution, soil pollution, etc.

Q8: If all the waste we generate is biodegradable, will this have no impact on the environment?

Answer:

All the generated waste is biodegradable then it may also pollute the environment because the biodegradable waste also needs to be decomposed within a particular time but it generates more, so it accumulates in the environment and this accumulation leads to environmental pollution. 

Q9: Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?

Answer: 

Ozone layer damage is a cause for concern because ozone layer depletion causes aging, skin darkening, skin cancer, eye cataracts, and global warming.

To limit the damage to the Ozone layer, the CFCs release must be reduced into the environment. CFCs use should be replaced with the environmentally safe alternatives.

*As per the revised curriculum of CBSE Syllabus 2023-24, this chapter, previously known as Chapter 15, has now been renumbered as Chapter 13. Stay updated with the latest changes in the curriculum.

Our Environment Class 10 NCERT Solution is all about the environment. These NCERT Solutions are prepared by our Top Biology Experts in order to take care of all Important Topics that might be asked in the upcoming examination 2023. So, Students can also refer to these solutions for their final Examination preparation.

This Class 10 Biology Chapter 13 Our Environment NCERT Solutions are carefully developed using easy-to-understand language while adhering to the guidelines for solving NCERT Solutions for Class 10. Working through these solutions can be highly beneficial for students in their board exams, as well as in preparing for future competitive Exams.