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Our Environment Class 10 Science MCQ With Solutions

Update on: 02 Feb 2024, 11:57 AM

The Our Environment Class 10 Science MCQ with Answers is designed according to the latest Class 10 Science syllabus. and examination pattern recommended by CBSE for Standard 10. Students can also refer to more Chapter-wise MCQs for NCERT Class 10 Science. This resource will be particularly beneficial for students aiming to achieve high marks in their academic studies, as it allows them to practice multiple-choice questions on specific subjects.

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CBSE Class 10 Chapter 13 Our Environment MCQs

Check below the MCQ Questions for class 10 Science with answers and Clear your idea of chapter 13 Our Environment.

Q.1. The process of entry of pollutants into a food chain is known as

(a) biomass (b) biomagnification
(c) bioaccumulation (d) biosphere

Answer

(c): Bioaccumulation is the accumulation of substances such as pesticides or other chemicals in an organism. It occurs when an organism absorbs a substance at a rate faster than that at which the substance is lost by catabolism and excretion.

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Q.2. In the food chain given below, if the amount of energy available at fourth trophic level is 3 kJ, what was the energy available at the herbivore level?
Grass → Grasshopper → Frog → Snake → Hawk

(a) 3000 kJ (b) 300 kJ
(c) 30 kJ (d) 3 kJ

Answer

Q.3. Acid rain is caused by

(a) sulphur oxides only
(b) nitrogen oxides only
(c) both nitrogen and sulphur oxides
(d) none of these

Answer

(c): Acid rain is caused by oxides of nitrogen (e.g., NO₂ and NO₃ ) and oxides of sulphur (e.g., SO₂ and SO₃ ).

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Q.4. In the given figure, various trophic levels are shown in a pyramid. At which trophic level minimum energy is available?

question 4

(a) T₄ (b) T₂
(c) T₁ (d) T₃

Answer

(a): T1 has maximum energy and it keeps on reducing as we proceed to the next higher trophic levels. Hence, T4 will have the minimum energy.

Q.5. The right path of energy flow in an ecosystem is

(a) Producer → Herbivore → Carnivore
(b) Producer → Carnivore → Herbivore
(c) Herbivore → Carnivore → Producer
(d) Herbivore → Producer → Carnivore.

Answer

(a): Energy flows in an ecosystem in the following direction:
Producer → Herbivore → Carnivore

Q.6. Minamata disease is due to

(a) MIC gas (b) methyl mercury
(c) lead nitrate (d) cobalt chloride.

Answer

(b): Minamata disease is a neurological disorder caused by methyl mercury poisoning. It was first reported near Minamata Bay in Japan in 1956. The symptoms include ataxia, numbness in hands and feet, muscle weakness, damage to hearing and speech.

Q.7. According to Charles Elton, which is not correct?

(a) Carnivores at the top of the pyramid.
(b) Producers at the top of the pyramid.
(c) Energy trapping is high at the top of the pyramid.
(d) Both (b) and (c)

Answer

(d): Charles Elton developed the concept of ecological pyramid. After his name, these pyramids are called as Eltonian pyramids. According to Charles Elton, producers are present at the base of the pyramid and carnivores at the top. According to 10% law of energy transfer, energy goes on decreasing with increase in trophic levels. Thus, energy trapping is high at the base of the pyramid and lowest at top of the pyramid.

Q.8. Which of the followings is abiotic component of an ecosystem?

(a) Producer (b) Consumer
(c) Soil and minerals (d) All of these

Answer

(c): All the interacting organisms in an area together with the non-living constituents of the environment form an ecosystem. Thus, an ecosystem consists of biotic components comprising living organisms and abiotic factors like temperature, rainfall, wind, soil and minerals

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Q.9. In a food chain usually the following are found at the third trophic level

(a) producers (b) primary consumer
(c) decomposer
(d) secondary consumer.

Answer

(d): The transfer of food or energy takes place in the various steps or levels in the food chain which are known as trophic levels. Producers or autotrophs are the first trophic level because they fix up the solar energy and make it available for the heterotrophs or the consumers to the next trophic level. Herbivores (primary consumers) are in second trophic level, secondary consumers (carnivores) are in third trophic level and so on.

Q.10. In a given food chain if frog has 100 J of energy then the energy available with plants and snake respectively will be
Plants → Insect → Frog → Snake

(a) 1000 J and 10 J (b) 10000 J and 10 J
(c) 10 J and 1000 J (d) 1000 J and 100 J.

Answer

(b): According to 10% law of energy transfer in a food chain, if a frog has 100 J of energy then the energy in plants will be 10,000 J, 1,000 J in insect and it will be 10 J in snake

CBSE Class 10 Science Our Environment MCQs – PDF Download

Answers-

Summary for NCERT class 10 science chapter 13 – “Our Environment”

The various components of an ecosystem are interdependent.
The producers make the energy from sunlight available to the rest of the ecosystem.
There is a loss of energy as we go from one trophic level to the next, this limits the number of trophic levels in a food-chain.
Human activities have an impact on the environment.
The use of chemicals like CFCs has endangered the ozone layer. Since the ozone layer protects against the ultraviolet radiation from the Sun, this could damage the environment.
The waste we generate may be biodegradable or non-biodegradable.
The disposal of the waste we generate is causing serious environmental problems.

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