In CBSE Class 10 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given.

Here we are providing you with Class 10 Science Chapter 15 Our Environment Case Study Questions, by practicing these Case Study and Passage Based Questions will help you in your Class 10th Board Exam.

Case Study Chapter 15 Our Environment

Here, we have provided case-based/passage-based questions for Class 10 Science Chapter 15 Our Environment

Case Study/Passage Based Questions

Question 1:

In any given ecosystem, all living organisms are linked in a systematic chain with respect to their mode of manufacturing food/feeding habits. This sequential interlinking of organisms involving the transfer of food energy from producers through a series of organisms with repeated eating and being eaten is called the food chain. A food chain may have 3-4 trophic levels.

(i) Which of the following statements regarding the food chain is incorrect?
(a) It is a single straight pathway through which food energy travels in the ecosystem.
(b) It adds adaptability and competitiveness to the organisms.
(c) Presence of isolated food chains adds to the instability of the ecosystem.
(d) Food chain binds up the inorganic nutrients of the ecosystem.

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(ii) Consider the following food chain.
Grass ⟶⟶A ⟶⟶Frog ⟶⟶ Snake⟶⟶Eagle
Which of the following can be placed at A?

(a) Grasshopper

(b) Rabbit

(c) Phytoplankton

(d) Rat

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(iii) Select the correct food chain.
(a) Aquatic plants ⟶⟶ Tadpole ⟶⟶Water beetle⟶⟶Pike⟶⟶Perch
(b) Grass⟶⟶Grasshopper⟶⟶Snake⟶⟶ Frog⟶⟶ Eagle
(c) Grass⟶⟶ Rabbit⟶⟶ Wild cat⟶⟶ Tiger
(d) Zooplankton ⟶⟶ Phytoplankton ⟶⟶Small fish⟶⟶Fish

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(iv) Food chains are sustained by producers and _____________.

(a) herbivores

(b) carnivores

(c) omnivores

(d) decomposers

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(v) Select the incorrect statement.
(a) Food chain may terminate at level of herbivore
(b) Food chain is always straight
(c) Food chain may have 3-5 trophic levels
(d) In a food chain, 80 to 90% of potential energy is lost as heat, at each transfer

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Question 2:

An ecosystem may be defined as a structural and functional unit of the biosphere comprising living organisms and their non-living environment which interact by means of food chains and biogeochemical cycles resulting in energy flow, biotic diversity, and material cycling to form a stable, self-supporting system.

2.1) The two basic processes involved in an ecosystem are :
(a) cycling of materials and food chains
(b) energy flow and self-sustainability
(c) carbon cycle and biotic diversity
(d) cycling of materials and flow of energy

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2.2) Which among the following is not an artificial ecosystem?
(a) Orchard
(b) Lake
(c) Aquarium
(d) Cropland 

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2.3) The role of fungi and bacteria in an ecosystem is to :
(a) increase the supply of nutrients
(b) increase the supply of energy
(c) release nutrients from dead organic matter
(d) increase the amount of carbon dioxide in the atmosphere

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2.4) What would be one of the likely results be if all decomposers in a particular ecosystem were wiped out?
(a) The atmospheric reservoir of carbon dioxide would decline. 
(b) More food would be available for other consumers in the ecosystem. 
(c) The other organisms in the ecosystem would experience lower death rates. 
(d) There would be no significant impact, as dead organic matters would spontaneously decompose. 

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2.5) Which of the following holds true for an ecosystem?
(a) Animals can live without plants.
(b) Plants can live without animals.
(c) Animals can survive for long without plants.
(d) Plants can survive for long without animals.

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You can also practice Class 10 Science MCQ Questions for Board Exams.