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Assertion & Reason Test: Our Environment - Class 10 MCQ


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25 Questions MCQ Test Science Class 10 - Assertion & Reason Test: Our Environment

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

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Green plants of the ecosystem are the transducers.

Reason : Producers trap the radiant energy of the sun and change it into chemical energy.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 1
Explanation:
The given assertion and reason are related to the role of green plants in the ecosystem. Let's break down the explanation into headings and bullet points for better understanding:
Assertion: Green plants of the ecosystem are the transducers.
- This statement asserts that green plants play the role of transducers in the ecosystem.
Reason: Producers trap the radiant energy of the sun and change it into chemical energy.
- This statement provides a reason for the assertion by stating that producers (green plants) convert the radiant energy of the sun into chemical energy.
Now, let's analyze the given options:
A: Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
- This option states that both the assertion and reason are true, and the reason correctly explains the assertion. This option is correct because it aligns with the given statements.
B: Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).
- This option states that both the assertion and reason are true, but the reason does not correctly explain the assertion. However, this option is incorrect because the reason does explain the assertion.
C: Assertion (A) is true but reason (R) is false.
- This option states that the assertion is true, but the reason is false. However, this option is incorrect because both the assertion and reason are true.
D: Assertion (A) is false but reason (R) is true.
- This option states that the assertion is false, but the reason is true. However, this option is incorrect because both the assertion and reason are true.
E: Both Assertion and Reason are false.
- This option states that both the assertion and reason are false. However, this option is incorrect because both the assertion and reason are true.
Therefore, the correct answer is option A: Both assertion (A) and reason (R) are true, and reason (R) is the correct explanation of assertion (A).
Assertion & Reason Test: Our Environment - Question 2

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Flow of energy in a food chain is unidirectional.

Reason : Energy captured by autotrophs does not revert back to the solar input and it passes to the herbivores.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 2
The flow of energy through different steps in the food chain is unidirectional. This means that energy captured by autotrophs does not revert back to the solar input and it passes to the herbivores.
Assertion & Reason Test: Our Environment - Question 3

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion :Praying mantis is green in colour which merges with plant foliage.

Reason : Animals adopt different strategies to survive in hostile environment.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 3

Animals blend with the surroundings or background to remain unnoticed for protection and aggression.

Assertion & Reason Test: Our Environment - Question 4

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : CFCs deplete the ozone layer.

Reason : CFCs are used as refrigerants and in fire extinguishers.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 4
Ozone layer is getting depleted at the higher levels of the atmosphere due to the effect of chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers.
Assertion & Reason Test: Our Environment - Question 5

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The crown fires are most destructive as they burn the tree top.

Reason : Due to crown fire the temperature of that area may rise upto 700°C.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 5
Crown files are most destructive. These destroy the canopies of trees and entire vegetational cover of that particular area. Due to this fire, the temperature rises upto 700°C and may adversely affect the vegetation.
Assertion & Reason Test: Our Environment - Question 6

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A biotic component of an ecosystem involves cycling of material and flow of energy.

Reason : This is essential to keep biotic factors alive.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 6
The assertion is correct because plants can synthesize food due to the presence of abiotic components like carbon dioxide and sunlight, due to which energy is produced. This energy is transferred at each trophic level.

The reason is correct because due to energy obtained, organisms at each trophic level sustain.

Assertion & Reason Test: Our Environment - Question 7

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Man is a herbivore.

Reason : Omnivores eat both plant food and meat of animals.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 7
Man is an example of an omnivorous animal because Omni means all and vore means eater. An organism which can feed on the plant, as well as the meat of the animal, are called omnivorous.

Man consumes plants (fruit vegetables) and also eats the meat of animals like goat, chicken etc thus man is considered as the Omnivorous animal.

Assertion & Reason Test: Our Environment - Question 8

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Trophic levels are formed by only plants.

Reason : Food chains and webs are formed due to linked organisms on the basis of their nutrition.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 8
A trophic level is the position of an organism in a food chain. A food chain starts with producers which are green plants and occupy the lowest trophic level. The highest trophic level is occupied by carnivores which feed on lower trophic levels for energy. A simple food chain is represented as

Plant ---> Herbivore ---> Carnivore

Hence, trophic levels are formed by different organisms linked in a food chain.

Assertion & Reason Test: Our Environment - Question 9

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Ecology is the study of the relationship between living organisms and their environment.

Reason : The biotic community and non-living environment of an area function together to form an ecosystem.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 9
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 components comprising physical factors like temperature, rainfall, wind, soil and minerals.
Assertion & Reason Test: Our Environment - Question 10

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Consumers are present at the first trophic level.

Reason: Consumers or heterotrophs fix energy making it available for autotrophs.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 10
Autotrophs are present at the first trophic level because they fix solar energy, making it available for consumers or heterotrophs.
Assertion & Reason Test: Our Environment - Question 11

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Decomposers keep the environment clean.

Reason : They recycle matter by breaking down the organic remains and waste products of plants and animals.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 11
Decomposers keep the environment clean by decomposing or consuming the dead remains of other organisms.
Assertion & Reason Test: Our Environment - Question 12

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Garden is an artificial ecosystem.

Reason : Biotic and abiotic components are manipulated by humans.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 12
Crop fields are man made and some biotic and abiotic components are manipulated by humans. Artificial ecosystems are those ecosystems which are modified and managed by human beings.

Crop fields are man-made, plants do not grow naturally; rather , most of the plants are grown by humans according to the season, type of soil, etc. Crop fields are not like wild forest areas which are left to the care of nature and can sustain themselves.

In crop fields, the land is managed, soil is prepared for sowing seeds, then irrigated and further progress is also kept under observation for getting good yield.

Thus, crop fields are known as artificial ecosystems.

Assertion & Reason Test: Our Environment - Question 13

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Biotic components of the ecosystem continuously require energy to carry on life processes.

Reason : Abiotic components are the nonliving factors of the ecosystem.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 13
An abiotic factor is a non-living part of an ecosystem that shapes its environment. In a terrestrial ecosystem, examples might include temperature, light, and water. In a marine ecosystem, abiotic factors would include salinity and ocean currents. Abiotic and biotic factors work together to create a unique ecosystem.
Assertion & Reason Test: Our Environment - Question 14

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Decomposers act as cleaning agents of the environment.

Reason : The decomposers recycle waste material in the hydrosphere.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 14
Organisms which break down the complex organic compounds present in dead and decaying matter are called decomposers, e.g., certain bacteria and fungi. Decomposers act as cleaning agents of the environment by decomposing the dead bodies of plants and animals. They also help in recycling of materials, replenishment of soil's nutrients etc. The consequence of their absence in an ecosystem can be disastrous as discussed below

(i) The dead bodies would keep lying, it would lead to their accumulation and thus, polluting the environment.

(ii) The elements by which bodies are made would never be returned to the environment. As a result, all the nutrients present in soil, air and water would soon be exhausted and the whole life cycle of organisms will be disrupted.

Assertion & Reason Test: Our Environment - Question 15

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Supersonic jets cause pollution as they thin out ozone.

Reason : Depletion of ozone causes greenhouse effect.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 15
90% of naturally occurring atmospheric ozone occurs in the stratosphere. Stratospheric ozone is very important, it removes almost all incoming UVA, and 70% of the incoming UVB at equator, 90% at poles. All aircraft produce water, CO2, CO etc. in exhaust gases. Most commercial flights are confined to the troposphere, but high-level supersonic aircraft inject pollutants into the stratosphere, which leads to the thinning of the ozone layer. Of these nitrogen oxides are especially harmful.
Assertion & Reason Test: Our Environment - Question 16

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Ozone is both beneficial and damaging.

Reason : Stop the release of chlorofluorocarbons to protect the ozone.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 16
Ozone is damaging as it is a deadly poison. It is beneficial as it shields the surface of the earth from UV radiations of the Sun. We should stop the release of Chlorofluorocarbons (CFCs) to protect the ozone.
Assertion & Reason Test: Our Environment - Question 17

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Aquatic f o o d chain is the food chain present in water bodies.

Reason : The example of an aquatic food chain is phytoplankton → zooplankton → fish → shark.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 17
Aquatic food chain is the food chain present in water bodies, e.g. phytoplankton → zooplankton → fish → shark
Assertion & Reason Test: Our Environment - Question 18

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Polythene bags and plastic containers are non-biodegradable substances.

Reason: They can be broken down by microorganisms in natural simple harmless substances.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 18
Substances like polythene bags and plastics are non- biodegradable because they cannot be broken down by micro-organisms into simpler harmless substances in nature. Substances that can be broken down by microorganisms in natural simple harmless substances are biodegradable substances.
Assertion & Reason Test: Our Environment - Question 19

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion: Herbivores are called first order consumers.

Reason : Tiger is a top carnivore.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 19
Herbivores obtain their food from plants. Hence, they are known as first order carnivores. The carnivores like tigers cannot be preyed upon further, lie at the top of the food chain and hence termed as top carnivores.
Assertion & Reason Test: Our Environment - Question 20

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : In an ecosystem, the function of producers is to convert organic compounds into inorganic compounds.

Reason : Green plants, the producers, transduce solar energy.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 20

The producers convert inorganic compounds into organic compounds by converting light energy given by the sun into chemical energy.

Thus, both the assertion and reason are correct, and the reason is the correct explanation for the assertion.

Assertion & Reason Test: Our Environment - Question 21

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : First trophic level in a food chain is always a green plant.

Reason : Green plants are called producers.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 21
Green plants are producers. The first trophic level in a food chain is a producer i.e. those organisms which produce food by photosynthesis.
Assertion & Reason Test: Our Environment - Question 22

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Tropical rain forests are disappearing fast from developing countries such as India.

Reason : No value is attached to these forests because they are poor in biodiversity.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 22
Tropical rain forests have disappeared mainly due to man’s activities. Due to overpopulation in countries like India, rain forests are cut to make space available for man to live and build houses. To build buildings and factories man has incessantly cut down trees. This has caused the depletion of rainforests.
Assertion & Reason Test: Our Environment - Question 23

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : The concentration of harmful chemicals is more in human beings.

Reason : Man is at the apex of the food chain.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 23
Harmful chemicals accumulate progressively at each trophic level. Since man is at the apex of all the food chains, the concentration of harmful chemicals may be higher in human beings. The phenomenon involved is known as biomagnification.
Assertion & Reason Test: Our Environment - Question 24

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : A network of food chains existing together in an ecosystem is known as the food web.

Reason : An animal like a kite cannot be a part of a food web.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 24
In the food web different food chains are interconnected. Each chain consists of different trophic levels i.e., producers, consumers and detritivores. So, kite can also be a part of food web
Assertion & Reason Test: Our Environment - Question 25

Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:

Assertion : Biomagnification is caused due to the accumulation of biodegradable toxicants in organisms at each successive trophic level.

Reason : Biomagnification leads to the maximum accumulation of chemicals in small fishes.

Detailed Solution for Assertion & Reason Test: Our Environment - Question 25
Biomagnification is caused due to the accumulation of non-biodegradable toxicants in organisms at each successive trophic level. The maximum concentration of these chemicals gets accumulated in the human body because they occupy the topmost place in any food chain.
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