Q. In a food chain, which of the following is a primary consumer? (2019)
A.
Grass
B.
Rabbit
C.
Fox
D.
Eagle
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Solution
A rabbit is a primary consumer as it feeds on plants (producers).
Correct Answer:
B
— Rabbit
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Q. In a food chain, which of the following is the correct order of energy flow? (2021)
A.
Producer → Consumer → Decomposer
B.
Consumer → Producer → Decomposer
C.
Decomposer → Producer → Consumer
D.
Producer → Decomposer → Consumer
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Solution
The correct order of energy flow in a food chain is Producer → Consumer → Decomposer.
Correct Answer:
A
— Producer → Consumer → Decomposer
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Q. In an ecosystem, which of the following organisms is known as a primary consumer? (2019)
A.
Herbivores
B.
Carnivores
C.
Decomposers
D.
Producers
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Solution
Herbivores are primary consumers as they feed directly on producers (plants).
Correct Answer:
A
— Herbivores
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Q. In an ecosystem, which of the following organisms is known as a primary producer? (2021)
A.
Herbivores
B.
Carnivores
C.
Decomposers
D.
Plants
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Solution
Plants are primary producers as they convert sunlight into chemical energy through photosynthesis.
Correct Answer:
D
— Plants
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Q. What is a trophic level? (2020)
A.
A level of energy in an ecosystem
B.
A level of biodiversity
C.
A level of pollution
D.
A level of soil fertility
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Solution
A trophic level refers to the position an organism occupies in a food chain, indicating its energy level.
Correct Answer:
A
— A level of energy in an ecosystem
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Q. What is the main factor that determines the type of ecosystem in a particular area? (2019)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
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Solution
Climate is the main factor that determines the type of ecosystem, influencing temperature and precipitation patterns.
Correct Answer:
B
— Climate
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Q. What is the main function of decomposers in an ecosystem? (2020)
A.
Produce energy
B.
Consume primary producers
C.
Recycle nutrients
D.
Provide shelter
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Solution
Decomposers recycle nutrients by breaking down dead organic matter, returning essential nutrients to the soil.
Correct Answer:
C
— Recycle nutrients
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Q. What is the main function of producers in an ecosystem? (2019)
A.
To consume other organisms
B.
To decompose organic matter
C.
To produce energy through photosynthesis
D.
To compete for resources
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Solution
Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.
Correct Answer:
C
— To produce energy through photosynthesis
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Q. What is the primary factor that determines the type of ecosystem in a particular area? (2022)
A.
Soil type
B.
Climate
C.
Topography
D.
Human activity
Show solution
Solution
Climate is the primary factor that determines the type of ecosystem in a particular area, influencing temperature and precipitation.
Correct Answer:
B
— Climate
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Q. What is the primary function of decomposers in an ecosystem? (2022)
A.
Produce energy
B.
Consume primary producers
C.
Break down dead organic matter
D.
Compete with herbivores
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Solution
Decomposers break down dead organic matter, recycling nutrients back into the ecosystem.
Correct Answer:
C
— Break down dead organic matter
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Q. What is the primary function of producers in an ecosystem? (2019)
A.
To consume other organisms
B.
To decompose organic matter
C.
To produce energy through photosynthesis
D.
To compete for resources
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Solution
Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.
Correct Answer:
C
— To produce energy through photosynthesis
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Q. What is the primary process by which energy enters an ecosystem? (2022)
A.
Respiration
B.
Photosynthesis
C.
Decomposition
D.
Transpiration
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Solution
Photosynthesis is the primary process by which energy from sunlight is converted into chemical energy by plants.
Correct Answer:
B
— Photosynthesis
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Q. What is the primary producer in a freshwater ecosystem? (2022)
A.
Fish
B.
Algae
C.
Fungi
D.
Bacteria
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Solution
Algae are the primary producers in a freshwater ecosystem as they perform photosynthesis.
Correct Answer:
B
— Algae
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Q. What is the primary producer in a terrestrial ecosystem? (2019)
A.
Herbivores
B.
Carnivores
C.
Plants
D.
Decomposers
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Solution
Plants are the primary producers in terrestrial ecosystems as they convert sunlight into energy through photosynthesis.
Correct Answer:
C
— Plants
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Q. What is the primary source of energy for an ecosystem? (2020)
A.
Wind
B.
Water
C.
Sunlight
D.
Soil
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Solution
Sunlight is the primary source of energy for most ecosystems, as it drives photosynthesis in plants.
Correct Answer:
C
— Sunlight
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Q. What is the process by which energy is transferred from one trophic level to another? (2020)
A.
Photosynthesis
B.
Respiration
C.
Food chain
D.
Decomposition
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Solution
The food chain illustrates how energy is transferred from one trophic level to another in an ecosystem.
Correct Answer:
C
— Food chain
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Q. What is the process by which nutrients are recycled in an ecosystem? (2020)
A.
Photosynthesis
B.
Decomposition
C.
Respiration
D.
Transpiration
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Solution
Decomposition is the process by which nutrients are recycled in an ecosystem, breaking down dead organic matter.
Correct Answer:
B
— Decomposition
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Q. What is the role of producers in an ecosystem? (2021)
A.
They consume other organisms.
B.
They decompose organic matter.
C.
They convert solar energy into chemical energy.
D.
They compete for resources.
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Solution
Producers convert solar energy into chemical energy through photosynthesis, forming the base of the food chain.
Correct Answer:
C
— They convert solar energy into chemical energy.
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Q. What is the significance of the energy pyramid in an ecosystem? (2019)
A.
It shows the distribution of biomass
B.
It illustrates the flow of energy
C.
It indicates the number of species
D.
It measures the level of pollution
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Solution
The energy pyramid illustrates the flow of energy through different trophic levels in an ecosystem.
Correct Answer:
B
— It illustrates the flow of energy
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Q. What is the term for the maximum population size that an environment can sustain? (2020)
A.
Carrying capacity
B.
Population density
C.
Biotic potential
D.
Ecological footprint
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Solution
Carrying capacity is the maximum number of individuals of a particular species that an environment can support sustainably.
Correct Answer:
A
— Carrying capacity
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Q. What term describes the role of an organism in its ecosystem? (2022)
A.
Habitat
B.
Niche
C.
Biome
D.
Community
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Solution
Niche refers to the role and position a species has in its environment, including all interactions with biotic and abiotic factors.
Correct Answer:
B
— Niche
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Q. Which of the following best describes a food chain? (2023)
A.
A complex network of feeding relationships
B.
A linear sequence of organisms through which energy flows
C.
The total number of organisms in an ecosystem
D.
The variety of species in a habitat
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Solution
A food chain is a linear sequence of organisms through which energy flows, from producers to consumers.
Correct Answer:
B
— A linear sequence of organisms through which energy flows
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Q. Which of the following best describes a food web? (2023)
A.
A linear sequence of energy transfer
B.
A complex network of feeding relationships
C.
A diagram showing only producers
D.
A representation of energy loss
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Solution
A food web is a complex network of feeding relationships that illustrates how different organisms are interconnected in an ecosystem.
Correct Answer:
B
— A complex network of feeding relationships
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Q. Which of the following best describes a trophic level? (2023)
A.
A group of organisms that share the same habitat
B.
A level in a food chain or food web
C.
The total biomass of an ecosystem
D.
The number of species in an ecosystem
Show solution
Solution
A trophic level refers to the position an organism occupies in a food chain or food web, indicating its role in energy transfer.
Correct Answer:
B
— A level in a food chain or food web
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Q. Which of the following best describes an ecosystem? (2023)
A.
A community of organisms interacting with each other
B.
A physical environment with no living organisms
C.
A group of similar species
D.
A community of living organisms interacting with their environment
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Solution
An ecosystem is defined as a community of living organisms interacting with their physical environment.
Correct Answer:
D
— A community of living organisms interacting with their environment
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Q. Which of the following cycles involves the movement of water through the ecosystem? (2021)
A.
Carbon cycle
B.
Nitrogen cycle
C.
Water cycle
D.
Phosphorus cycle
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Solution
The water cycle describes the continuous movement of water within the Earth and atmosphere.
Correct Answer:
C
— Water cycle
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Q. Which of the following cycles is essential for the growth of plants? (2021)
A.
Water cycle
B.
Carbon cycle
C.
Nitrogen cycle
D.
All of the above
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Solution
All of the above cycles (water, carbon, and nitrogen) are essential for the growth of plants.
Correct Answer:
D
— All of the above
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Q. Which of the following cycles is involved in the process of photosynthesis? (2022)
A.
Nitrogen cycle
B.
Carbon cycle
C.
Phosphorus cycle
D.
Water cycle
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Solution
The carbon cycle is involved in photosynthesis, as plants absorb carbon dioxide from the atmosphere.
Correct Answer:
B
— Carbon cycle
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Q. Which of the following ecosystems has the highest biodiversity? (2020)
A.
Desert
B.
Tundra
C.
Tropical rainforest
D.
Grassland
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Solution
Tropical rainforests have the highest biodiversity among ecosystems due to their warm climate and abundant rainfall.
Correct Answer:
C
— Tropical rainforest
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Q. Which of the following ecosystems is characterized by high biodiversity? (2021)
A.
Desert
B.
Tundra
C.
Tropical rainforest
D.
Grassland
Show solution
Solution
Tropical rainforests are known for their high biodiversity due to favorable climatic conditions.
Correct Answer:
C
— Tropical rainforest
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Showing 1 to 30 of 36 (2 Pages)
Ecology - Ecosystem MCQ & Objective Questions
Understanding "Ecology - Ecosystem" is crucial for students preparing for school exams and competitive tests in India. This topic not only forms a significant part of the syllabus but also helps in developing a clear understanding of how living organisms interact with their environment. Practicing MCQs and objective questions on this subject can enhance your exam preparation and boost your confidence in tackling important questions effectively.
What You Will Practise Here
Definitions and key concepts of ecology and ecosystems
Types of ecosystems: terrestrial, aquatic, and artificial
Energy flow and food chains in ecosystems
Biogeochemical cycles: carbon, nitrogen, and water cycles
Ecological succession and its stages
Impact of human activities on ecosystems
Important diagrams related to ecosystems and energy flow
Exam Relevance
The topic of "Ecology - Ecosystem" is frequently featured in CBSE, State Boards, NEET, and JEE exams. Students can expect questions that assess their understanding of ecological principles, energy dynamics, and the interdependence of organisms. Common question patterns include multiple-choice questions that require students to identify processes, analyze diagrams, and apply concepts to real-world scenarios.
Common Mistakes Students Make
Confusing the terms "ecosystem" and "habitat"
Misunderstanding the flow of energy in food chains
Overlooking the significance of biogeochemical cycles
Failing to recognize the impact of invasive species on ecosystems
FAQs
Question: What is an ecosystem?Answer: An ecosystem is a community of living organisms interacting with each other and their physical environment.
Question: Why are food chains important in an ecosystem?Answer: Food chains illustrate the flow of energy and nutrients between organisms, highlighting the interdependence of species.
Now is the time to enhance your understanding of "Ecology - Ecosystem" by solving practice MCQs. Test your knowledge, identify your strengths, and work on your weaknesses to excel in your exams!