NCERT Solutions for Class 10 Science Chapter 15

NCERT Solutions for Class 10 Science Chapter 15 Our Environment Page 257 or Page 261 or Page 264 or Exercises in English or पेज 289 or पेज 294 or पेज 296 or अभ्यास के प्रश्न उत्तर in हिंदी to study online free or download in PDF form.


NCERT Solutions for Class 10 Science Chapter 15

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English Medium

NCERT Maths Solutions for class x and solutions of other subjects are also in PDF format. Study online or download, use as per your requirement.




Hindi Medium

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10 Science Chapter 15 Page 257 Answers





Class 10 Science Chapter 15 Our Environment Intext questions given on page 257 is given below. For other answers please visit to Page 261 or Page 264 or Exercises or go for Hindi Medium Solutions. Visit to Class 10 Science main page or Top of the page.

Class 10 Science Chapter 15 Our Environment Intext questions given on page 257 i

10 Science Chapter 15 Page 261 Answers




NCERT Solutions for Class 10 Science Chapter 15 Intext questions given on page 261 is given below. For other answers please visit to Page 257 or Page 264 or Exercises or go for Hindi Medium Solutions. Visit to Class 10 Science main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 15 Intext questions given on page 261

10 Science Chapter 15 Page 264 Answers




Class 10 Science Chapter 15 Intext questions given on page 264 is given below. For other answers please visit to Page 257 or Page 261 or Exercises or go for Hindi Medium Solutions. Visit to Class 10 Science main page or Top of the page.

Class 10 Science Chapter 15 Intext questions given on page 264

10 Science Chapter 15 Exercises Answers





NCERT Solutions for Class 10 Science Chapter 15 Our Environment Exercises answers are given below. For other answers please visit to Page 257 or Page 261 or Page 264 or go for Hindi Medium Solutions. Visit to Class 10 Science main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 15 Our Environment Exercises



class 10 science ch. 15 in pdf
10 science ch. 15

10 विज्ञान अध्याय 15 पेज 289 के प्रश्न उत्तर




NCERT Solutions for Class 10 Science Chapter 15 Our Environment Intext questions given on page 289 is given below. For other answers please visit to  पेज 294 or पेज 296 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 15 page 289 in hindi

10 विज्ञान अध्याय 15 पेज 294 के प्रश्न उत्तर





10 Science Chapter 15 page 294 answer is given below. For other answers please visit to  पेज 289 or पेज 296 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science main page or Top of the page.

10 Science Chapter 15 page 294 answer

10 विज्ञान अध्याय 15 पेज 296 के प्रश्न उत्तर




Class 10 Science Chapter 15 page 296 is given below. For other answers please visit to  पेज 289 or पेज 294 or अभ्यास के प्रश्न उत्तर or go for English Medium Solutions. Visit to Class 10 Science main page or Top of the page.

Class 10 Science Chapter 15 page 296

10 विज्ञान अध्याय 15 के अभ्यास के प्रश्न उत्तर





NCERT Solutions for Class 10 Science Chapter 15 Our Environment अभ्यास के प्रश्न उत्तर  given below. For other answers please visit to  पेज 289 or पेज 294 or पेज 298 or go for English Medium Solutions. Visit to Class 10 Science main page or Top of the page.

NCERT Solutions for Class 10 Science Chapter 15 all answers in hindi




chapter 15 pdf class 10

Visit to Class 10 Science main page or Top of the page

Class X Science – Our Environment
Important Questions with Answers for CBSE Board – 2019

Question 1:
What are two components of our environmental?
Answer 1:
(i) Biotic components: Plants and animals.
(ii) Abiotic components: Air, water, soil etc.

Question 2:
Mention one negative effect of our affluent life style on the environment.
Answer 2:
Excessive use of fossil fuel, even when we have to go nearby we use car, motor cycle, etc. instead going on foot or by cycle. Fossil fuels, on burning produce oxides of carbon, nitrogen and sulphur which cause air pollution.

Question 3:
Distinguish between biodegradable and non-biodegradable substances. List two effects of each of them on our environment.
Answer 3:
Biodegradable:
(i) They can be broken into simplest form by biological processes.
(ii) They do not produce more pollution.
(iii) They remain for less time in environment.
Non-biodegradable:
(i) They cannot be broken by biological processes.
(ii) They produce more pollution.
(iii) They remain for a long time in the environment.
Effect of biodegradable substances:
(i) They release harmful gases like methane.
(ii) They release foul smell.
Effect of non-biodegradable substances:
(i) They are very harmful for the various member of the ecosystem.
(ii) They cause more pollution of air, water and soil.

Question 4:
Why is energy flow in the biosphere unidirectional?
Answer 4:
The sun is the only source of energy which plants trap during photosynthesis and store as food. The transfer of energy from one trophic level to the other obeys 10% law, i.e., 90% of energy is lost as heat. The energy in the form of heat goes unutilised because plants cannot use this heat energy in the synthesis of food. Thus, there is always flow of energy from the non-living component (then sun) and is released as heat. So, the energy flow in the biosphere is unidirectional.


More Questions for Exams

Question 1:
Explain the phenomenon of “biological magnification”. How does it affect organisms belonging to different trophic levels particularly the tertiary consumers?
Answer 1:
When any harmful chemical like DDT, BHC enters in a food chain the concentration of chemical increases as the trophic level is increased (i.e., next higher level). The phenomenon is called biological magnification.
These chemical, get accumulated progressively at each trophic level. It is maximum at the top (highest) trophic level. The tertiary consumers occupy the top trophic level (in most of the food chains) so there is maximum concentration of the harmful chemicals ant they are affected badly.

Question 2:
What is an Eco-system?
Answer 2:
Eco-system is the whole biotic community (living organisms) in a given area plus its abiotic environment (physical factors like temperature, rainfall, wind, soil and minerals) both interacting with each other and maintain a balance in nature. Eco-system can be as large as a forest, or small as a pond or lake. This functional system may be natural as forest or may be artificial (man-made), e.g., a crop field or an aquarium. Thus the Eco-system has biotic and abiotic components.



Question 3:
The flow of energy in food chain is unidirectional. Why?
Answer 3:
The flow of energy in a food chain follows 10% law. The energy used or lost in environment as heat, cannot enter at any trophic level in the food chain. Only solar energy can enters in the food chain at producer level and ultimately get lost as heat.

Question 4:
What is ozone and how it affect any Eco-system?
Answer 4:
Ozone(O3) a molecule formed by three atoms of oxygen. It is a deadly poisonous gas. However, at the higher level of atmosphere, it performs an essential function. It shields surface of earth from ultraviolet radiation (UV) of solar radiations. This radiation is highly damaging to organisms, it is known to cause skin cancer, cataract in human beings.


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