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Chapters
2: Acids, Bases and Salts
3: Metals and Non-metals
4: Carbon and its Compounds
5: Periodic Classification of Elements
6: Life Processes
7: Control and Coordination
8: How do Organisms Reproduce?
9: Heredity and Evolution
10: Light – Reflection and Refraction
11: The Human Eye and the Colourful World
12: Electricity
13: Magnetic Effects of Electric Current
14: Sources of Energy
▶ 15: Our Environment
16: Management of Natural Resources
![NCERT Exemplar solutions for Science [English] Class 10 chapter 15 - Our Environment - Shaalaa.com](/images/science-english-class-10_6:5f2b1b2038084cf381bfa42c826a928c.jpg "NCERT Exemplar solutions for Science [English] Class 10 chapter 15 - Our Environment")
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Solutions for Chapter 15: Our Environment
Below listed, you can find solutions for Chapter 15 of CBSE NCERT Exemplar for Science [English] Class 10.
NCERT Exemplar solutions for Science [English] Class 10 15 Our Environment Multiple Choice Questions [Pages 106 - 109]
Which one of the following is an artificial ecosystem?
Pond
Crop field
Lake
Forest
In a food chain, the third trophic level is always occupied by
carnivores
herbivores
decomposers
decomposers
An ecosystem includes
all living organisms
non-living objects
both living organisms and non-living objects
sometimes living organisms and sometimes non-living objects
In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
5 kJ
50 kJ
500 kJ
5000 kJ
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
eutrophication
pollution
biomagnification
accumulation
Depletion of ozone is mainly due to
chlorofluorocarbon compounds
carbon monoxide
methane
pesticides
Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called
decomposers
producers
herbivores
carnivores
In an ecosystem, the 10% of energy available for transfer from one trophic level to the next is in the form of
heat energy
light energy
chemical energy
mechanical energy
Organisms of a higher trophic level which feed on several types of organisms belonging to a lower trophic level constitute the
food web
ecological pyramid
ecosystem
food chain
Flow of energy in an ecosystem is always
unidirectional
bidirectional
multi directional
no specific direction
Excessive exposure of humans to UV-rays results in
- damage to immune system
- damage to lungs
- skin cancer
- peptic ulcers
(i) and (ii)
(ii) and (iv)
(i) and (iii)
(iii) and (iv)
In the following groups of materials, which group(s) contains only non-biodegradable items?
- Wood, paper, leather
- Polythene, detergent, PVC
- Plastic, detergent, grass
- Plastic, bakelite, DDT
(iii)
(iv)
(i) and (iii)
(ii) and (iv)
Which of the following limits the number of trophic levels in a food chain?
Decrease in energy at higher trophic levels
Sufficient food supply
Polluted air
Water
Which of the statement is incorrect?
All green plants and blue green algae are producers.
Green plants get their food from organic compounds.
Producers prepare their own food from inorganic compounds.
Plants convert solar energy into chemical energy.
Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
(i) and (iii)
(iii) and (iv)
(ii) and (iii)
(i) and (iv)
The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about
1%
5%
8%
10%
In the given figure the various trophic levels are shown in a pyramid. At which trophic level is maximum energy available?
T4
T2
T1
T3
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
The population of tiger increases
The population of grass decreases
Tiger will start eating grass
The population of tiger decreases and the population of grass increases
The decomposers in an ecosystem
convert inorganic material, to simpler forms
convert organic material to inorganic forms
convert inorganic materials into organic compounds
do not breakdown organic compounds
If a grasshopper is eaten by a frog, then the energy transfer will be from
producer to decomposer
producer to primary consumer
primary consumer to secondary consumer
secondary consumer to primary consumer
Disposable plastic plates should not be used because
they are made of materials with light weight
they are made of toxic materials
they are made of biodegradable materials
they are made of non-biodegradable materials
NCERT Exemplar solutions for Science [English] Class 10 15 Our Environment Short Answer Questions [Pages 109 - 110]
Why is improper disposal of waste a curse to environment?
Write the common food chain of a pond ecosystem.
What are the advantages of cloth bags over plastic bags during shopping?
Why are crop fields known as artificial ecosystems?
Differentiate between biodegradable and non-biodegradable substances. Cite examples.
Suggest one word for the following statement/definition.
The physical and biological world where we live in
Suggest one word for the following statement/definition.
Each level of food chain where transfer of energy takes place
Suggest one word for the following statement/definition.
The physical factors like temperature, rainfall, wind and soil of an ecosystem
Suggest one word for the following statement/definition.
Organisms which depend on the producers either directly or indirectly for food
Explain the role of decomposers in the environment?
Select the mis-matched pair in the following and correct it.
Biomagnification - Accumulation of chemicals at the successive trophic levels of a food chain
Ecosystem - Biotic components of environment
Aquarium - A man-made ecosystem
Parasites - Organisms which obtain food from other living organisms
We do not clean ponds or lakes, but an aquarium needs to be cleaned. Why?
NCERT Exemplar solutions for Science [English] Class 10 15 Our Environment Long Answer Questions [Page 110]
Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.
What are decomposers? What will be the consequence of their absence in an ecosystem?
Suggest any four activities in daily life which are eco-friendly.
Give two differences between food chain and food web.
Name the wastes which are generated in your house daily. What measures would you take for their disposal?
Suggest suitable mechanism(s) for waste management in fertilizer industries.
What are the by-products of fertiliser industries? How do they affect the environment?
Explain some harmful effects of agricultural practices on the environment.
Solutions for 15: Our Environment
NCERT Exemplar solutions for Science [English] Class 10 chapter 15 - Our Environment
Shaalaa.com has the CBSE Mathematics Science [English] Class 10 CBSE solutions in a manner that help students grasp basic concepts better and faster. The detailed, step-by-step solutions will help you understand the concepts better and clarify any confusion. NCERT Exemplar solutions for Mathematics Science [English] Class 10 CBSE 15 (Our Environment) include all questions with answers and detailed explanations. This will clear students' doubts about questions and improve their application skills while preparing for board exams.
Further, we at Shaalaa.com provide such solutions so students can prepare for written exams. NCERT Exemplar textbook solutions can be a core help for self-study and provide excellent self-help guidance for students.
Concepts covered in Science [English] Class 10 chapter 15 Our Environment are Waste and Its Categories, Ecosystem, Food Chain, Ozone Layer Depletion, Wastes Generated in Our Environment, Waste Separation Exercise, Solid Waste Management, Our needs and the Environment, Structure and function of an Ecosystem, Classification of Animal, Trophic Level, Food Web, Concept of Energy Flow in an Ecosystem.
Using NCERT Exemplar Science [English] Class 10 solutions Our Environment exercise by students is an easy way to prepare for the exams, as they involve solutions arranged chapter-wise and also page-wise. The questions involved in NCERT Exemplar Solutions are essential questions that can be asked in the final exam. Maximum CBSE Science [English] Class 10 students prefer NCERT Exemplar Textbook Solutions to score more in exams.
Get the free view of Chapter 15, Our Environment Science [English] Class 10 additional questions for Mathematics Science [English] Class 10 CBSE, and you can use Shaalaa.com to keep it handy for your exam preparation.
