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Test: Our Environment- 1 - Class 10 MCQ


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20 Questions MCQ Test Science Class 10 - Test: Our Environment- 1

Test: Our Environment- 1 for Class 10 2024 is part of Science Class 10 preparation. The Test: Our Environment- 1 questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Our Environment- 1 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Our Environment- 1 below.
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Test: Our Environment- 1 - Question 1

What factor has led to increased waste generation according?

Detailed Solution for Test: Our Environment- 1 - Question 1

Changes in lifestyle and attitudes have led to increased waste generation. Factors such as the use of disposable products, non-biodegradable packaging, and a shift towards convenience-driven consumer practices have contributed to the rising levels of waste production globally.

Test: Our Environment- 1 - Question 2

Which type of waste includes substances that can be decomposed by microorganisms?

Detailed Solution for Test: Our Environment- 1 - Question 2

Biodegradable wastes include substances that can be decomposed by the action of microorganisms. Examples of biodegradable waste mentioned are fruit and vegetable peels, cotton, jute, dung, and paper. These materials can be broken down naturally, reducing their impact on the environment over time.

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Test: Our Environment- 1 - Question 3

What is the main reason behind the depletion of the ozone layer in the 1980s?

Detailed Solution for Test: Our Environment- 1 - Question 3
The significant decrease in the ozone layer in the 1980s was primarily attributed to the use of synthetic chemicals like chlorofluorocarbons (CFCs). These chemicals were commonly used in various products such as refrigerants and fire extinguishers, contributing significantly to ozone depletion.
Test: Our Environment- 1 - Question 4
What is the composition of an ozone molecule?
Detailed Solution for Test: Our Environment- 1 - Question 4
An ozone molecule is composed of three oxygen atoms. This differs from the usual molecular oxygen (O2) that consists of two oxygen atoms. Despite being a deadly poison, ozone plays a critical role in protecting the Earth's surface from harmful UV radiation.
Test: Our Environment- 1 - Question 5
How did the international community respond to the issue of ozone depletion in 1987?
Detailed Solution for Test: Our Environment- 1 - Question 5
In 1987, the United Nations Environment Programme (UNEP) successfully negotiated an agreement to freeze the production of chlorofluorocarbons (CFCs) at 1986 levels. This was a pivotal step towards addressing the issue of ozone depletion on a global scale.
Test: Our Environment- 1 - Question 6
Why can't we obtain energy from non-digestible substances like coal?
Detailed Solution for Test: Our Environment- 1 - Question 6
Enzymes in our body are specific in their action and can only break down certain substances. This specificity is why we cannot obtain energy from non-digestible substances like coal. Enzymes play a crucial role in the digestion process by breaking down complex molecules into simpler forms that our bodies can absorb and utilize for energy.
Test: Our Environment- 1 - Question 7
Which of the following is an example of a non-biodegradable waste?
Detailed Solution for Test: Our Environment- 1 - Question 7
Plastic is an example of a non-biodegradable waste. Unlike biodegradable substances that can be broken down by microorganisms, plastics do not easily decompose in the environment. This characteristic leads to their persistence in ecosystems and contributes to environmental pollution.
Test: Our Environment- 1 - Question 8

What percentage of the sunlight energy that falls on the leaves of green plants in a terrestrial ecosystem is typically captured and converted into food energy?

Detailed Solution for Test: Our Environment- 1 - Question 8

Green plants in a terrestrial ecosystem typically capture around 1% of the sunlight energy that falls on their leaves and convert it into food energy. This process, known as photosynthesis, is vital for the survival of plants and the flow of energy through ecosystems.

Test: Our Environment- 1 - Question 9
What is the approximate percentage of food eaten by primary consumers that is converted into their own bodies and made available for the next level of consumers?
Detailed Solution for Test: Our Environment- 1 - Question 9
Only about 10% of the food eaten by primary consumers is typically converted into their own bodies and made available for the next level of consumers. This inefficiency in energy transfer is a key factor in shaping the structure and dynamics of ecosystems.
Test: Our Environment- 1 - Question 10
Why do harmful chemicals from pesticides and crop protection products tend to accumulate in humans at the top of the food chain?
Detailed Solution for Test: Our Environment- 1 - Question 10
Harmful chemicals from pesticides and crop protection products enter ecosystems and are absorbed by plants and animals. As organisms at lower trophic levels consume contaminated food sources, these chemicals accumulate in their bodies. Since humans are typically at the top of the food chain, they can accumulate higher concentrations of these chemicals through the consumption of contaminated plants and animals.
Test: Our Environment- 1 - Question 11
What is the ozone layer primarily responsible for?
Detailed Solution for Test: Our Environment- 1 - Question 11
The ozone layer acts as a protective shield around the Earth, absorbing most of the harmful UV radiation from the Sun. This absorption is crucial in safeguarding living organisms from various health risks such as skin cancer, cataracts, and harm to plant life.
Test: Our Environment- 1 - Question 12
Which trophic level typically consists of small carnivores or secondary consumers in a food chain?
Detailed Solution for Test: Our Environment- 1 - Question 12
The third trophic level usually comprises small carnivores or secondary consumers in a food chain. These organisms primarily feed on herbivores or primary consumers, transferring energy from lower trophic levels to higher trophic levels. This step is essential for balancing energy flow within the ecosystem.
Test: Our Environment- 1 - Question 13
What is the significance of decomposers in an ecosystem's food web?
Detailed Solution for Test: Our Environment- 1 - Question 13
Decomposers play a vital role in breaking down dead organic matter into simpler compounds, recycling nutrients back into the ecosystem. By decomposing organic material, they release essential nutrients that can be utilized by plants and other organisms, contributing to the overall health and sustainability of the ecosystem.
Test: Our Environment- 1 - Question 14
How does energy flow within a food chain or web?
Detailed Solution for Test: Our Environment- 1 - Question 14
Energy flows within a food chain or web from autotrophs to heterotrophs and decomposers. Autotrophs capture solar energy and convert it into chemical energy through photosynthesis, which is then passed on to herbivores, carnivores, and decomposers as they consume one another. This unidirectional flow of energy sustains the ecosystem and supports all living activities within it.
Test: Our Environment- 1 - Question 15
Why do food chains generally consist of only three or four trophic levels?
Detailed Solution for Test: Our Environment- 1 - Question 15
Food chains tend to be limited to three or four trophic levels primarily due to the significant energy loss that occurs at each step of the chain. As energy is transferred from one trophic level to the next, a considerable amount is lost as heat, making it challenging for energy to sustain higher trophic levels beyond a few steps.
Test: Our Environment- 1 - Question 16
What defines an ecosystem and its components, including both living and non-living elements interacting to maintain a balance in nature?
Detailed Solution for Test: Our Environment- 1 - Question 16
An ecosystem comprises both biotic (living organisms) and abiotic (physical factors) components that interact and influence each other. This interconnected system includes plants, animals, microorganisms, physical surroundings like temperature, soil, and minerals. The balance in nature is maintained through the interactions between these living and non-living elements.
Test: Our Environment- 1 - Question 17
In an artificial ecosystem like a garden or an aquarium, what characteristic distinguishes it from natural ecosystems?
Detailed Solution for Test: Our Environment- 1 - Question 17
Artificial ecosystems, like gardens or aquariums, are man-made environments where humans control and manipulate the ecosystem's components. Unlike natural ecosystems, which develop independently, artificial ecosystems are created by humans for specific purposes such as growing specific plants or keeping certain animals in captivity.
Test: Our Environment- 1 - Question 18
Which type of ecosystem is exemplified by a forest or an ocean that exists naturally in the environment?
Detailed Solution for Test: Our Environment- 1 - Question 18
Natural ecosystems, such as forests and oceans, are those that exist in nature on their own without human intervention. These ecosystems have developed over time and are sustained by the interactions between various living organisms and their physical environment.
Test: Our Environment- 1 - Question 19
What is the primary distinction between a natural ecosystem and an artificial ecosystem?
Detailed Solution for Test: Our Environment- 1 - Question 19
The key difference between a natural ecosystem and an artificial ecosystem lies in their origin. Natural ecosystems develop and exist in nature independently, while artificial ecosystems are deliberately created by humans. This distinction impacts the interaction dynamics, biodiversity, and sustainability of these ecosystems.
Test: Our Environment- 1 - Question 20
What type of organisms can produce their own food using photosynthesis?
Detailed Solution for Test: Our Environment- 1 - Question 20
Producers, such as green plants and blue-green algae, have the unique ability to produce their own food through photosynthesis. This process involves utilizing abiotic components like sunlight, water, and carbon dioxide to create glucose, serving as the foundation of the food chain in ecosystems.
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