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Case Based Questions Test: Our Environment - 2 - Super TET MCQ


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20 Questions MCQ Test Science for Super TET - Case Based Questions Test: Our Environment - 2

Case Based Questions Test: Our Environment - 2 for Super TET 2024 is part of Science for Super TET preparation. The Case Based Questions Test: Our Environment - 2 questions and answers have been prepared according to the Super TET exam syllabus.The Case Based Questions Test: Our Environment - 2 MCQs are made for Super TET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Case Based Questions Test: Our Environment - 2 below.
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Case Based Questions Test: Our Environment - 2 - Question 1
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Read the following passage given below and answer the questions:

A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.

Q. In eutrophicated water body, growth rate of phytoplankton is high because of:

Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 1
In an eutrophicated water body, the growth rate of phytoplankton is high because of the enrichment of nutrients in the water body.
Case Based Questions Test: Our Environment - 2 - Question 2
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Read the following passage given below and answer the questions:

A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.

Q. There is an extremely low level of dissolved oxygen in a eutrophicated water body because:

Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 2
There is an extremely low level of dissolved oxygen in a eutrophicated water body because of excessive growth of bacterial decomposers feeding on dead material which consume the dissolved oxygen.
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Case Based Questions Test: Our Environment - 2 - Question 3
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Study the following food web and answer the questions :

Which of these is the producer?

Case Based Questions Test: Our Environment - 2 - Question 4
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Study the following food web and answer the questions :

Which organisms represent top level carnivores?
Case Based Questions Test: Our Environment - 2 - Question 5
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Study the following food web and answer the questions :

Which organisms are primary consumers?
Case Based Questions Test: Our Environment - 2 - Question 6
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Study the following food web and answer the questions :

What will happen if we kill all the organisms in one trophic level?
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 6

If we kill all the organisms in one trophic level, the population of organisms in the previous trophic level will increase. This is because there will be no predators to eat them. The population of organisms in the next trophic level will decrease. This is because there will be no prey for them to eat.  Hence the correct answer is C. 

Case Based Questions Test: Our Environment - 2 - Question 7
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Study the following food web and answer the questions :

Which organisms will receive maximum energy in the ecosystem?
Case Based Questions Test: Our Environment - 2 - Question 8
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Read the following passage and answer the questions :

Human body is made up of five important components, of which water is the main component. Food as well as potable water is essential for every human being. The food is obtained from plants through agriculture; Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradable, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.

Q. Various steps in a food chain represent:
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 8
Various steps in a food chain are known as trophic levels. The first trophic level is of producers. The second trophic level is of primary consumers also known as herbivores, third of carnivores, or secondary consumers, fourth is of tertiary consumers also known as top carnivores.
Case Based Questions Test: Our Environment - 2 - Question 9
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Read the following passage and answer the questions :

Human body is made up of five important components, of which water is the main component. Food as well as potable water is essential for every human being. The food is obtained from plants through agriculture; Pesticides are being used extensively for a high yield in the fields. These pesticides are absorbed by the plants from the soil along with water and minerals and from the water bodies these pesticides are taken up by the aquatic animals and plants. As these chemicals are not biodegradable, they get accumulated progressively at each trophic level. The maximum concentration of these chemicals gets accumulated in our bodies and greatly affects the health of our mind and body.

Q. With regard to various food chains operating in an ecosystem, man is a:
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 9
Humans are top of the food chain because they are usually omnivorous. As they eat (or consume) organisms or products obtained from organisms, humans are consumers.
Case Based Questions Test: Our Environment - 2 - Question 10
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Waste management is essential in today ’s society. Due to an increase in population, the generation of waste is doubling day by day. Moreover, the increase in waste is affecting the lives of many people.

Waste management is the management of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

Q. Recycling of paper is a good practice but recycled paper should not be used as food packaging because
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 10
Why recycled paper should not be used as food packaging:
1. Risk of contamination:
- Recycled paper may contain traces of ink, chemicals, and other contaminants from the original paper.
- These contaminants can transfer to the food, posing a risk of infection or contamination.
2. Lack of barrier properties:
- Recycled paper may not have the same barrier properties as virgin paper.
- It may not provide an effective barrier against moisture, grease, and other food contaminants.
- This can lead to food spoilage, leakage, and potential health hazards.
3. Absorption and migration of substances:
- Recycled paper has a higher tendency to absorb and release substances.
- It can absorb moisture from the food, leading to a loss of quality and texture.
- It can also release substances from the paper into the food, affecting its taste and safety.
4. Difficulty in maintaining hygiene:
- Recycled paper may not be as hygienic as virgin paper.
- The recycling process may not completely remove all bacteria or pathogens present in the original paper.
- This can introduce harmful microorganisms into the food, increasing the risk of foodborne illnesses.
5. Regulatory concerns:
- Regulatory bodies may have specific guidelines and standards for food packaging materials.
- Recycled paper may not meet these standards, making it unsuitable for direct contact with food.
Overall, while recycling paper is a commendable practice for environmental sustainability, it is essential to prioritize food safety and choose appropriate packaging materials that meet the necessary hygiene and barrier requirements.
Case Based Questions Test: Our Environment - 2 - Question 11
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Waste management is essential in today ’s society. Due to an increase in population, the generation of waste is doubling day by day. Moreover, the increase in waste is affecting the lives of many people.

Waste management is the management of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

Q. The given graph shows the amount of waste generated, dumped and treated in percentage. Identify the reason for the low success rate of the waste management process.
Case Based Questions Test: Our Environment - 2 - Question 12
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Waste management is essential in today ’s society. Due to an increase in population, the generation of waste is doubling day by day. Moreover, the increase in waste is affecting the lives of many people.

Waste management is the management of waste by disposal and recycling of it. Moreover, waste management needs proper techniques keeping in mind the environmental situations. For instance, there are various methods and techniques by which the waste is disposed of. You must have come across 5 R’s to save the environment: refuse, reduce, reuse, repurpose and recycle.

Q. Effective segregation of wastes at the point of generation is very important. Select the appropriate statements giving the importance of waste segregation.

(1) less waste goes to the landfills

(2) better for public health and the environment

(3) help in reducing the waste

(4) resulting in deterioration of a waste picker ’s health
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 12
Importance of Waste Segregation:
- Waste segregation is the process of separating different types of waste materials at the point of generation. It plays a crucial role in effective waste management and has several important benefits, including:
- Less waste goes to the landfills: When waste is segregated properly, it becomes easier to identify recyclable materials and separate them from non-recyclable ones. This reduces the amount of waste that ends up in landfills, helping to conserve landfill space and minimize environmental impact.
- Better for public health and the environment: Effective waste segregation helps to minimize the release of harmful substances into the environment. By separating hazardous waste from regular waste, it reduces the risk of contamination and pollution. This, in turn, improves public health and protects ecosystems.
- Helps in reducing waste: Segregation allows for the identification of materials that can be reused or recycled. By separating these materials from the general waste stream, they can be diverted for appropriate treatment and processing. This not only reduces the amount of waste that needs to be disposed of but also promotes the conservation of resources.
- Prevents deterioration of waste picker's health: Waste pickers often work in hazardous conditions, sorting through mixed waste to salvage recyclable materials. Proper waste segregation reduces the risk of exposure to hazardous substances, protecting the health and well-being of waste pickers.
Therefore, effective segregation of waste at the point of generation is crucial for minimizing waste, protecting the environment, and promoting the health of both the public and waste pickers.
Case Based Questions Test: Our Environment - 2 - Question 13
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Read the following and answer the questions:

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. An ecosystem is defined as a structural and functional unit of the biosphere consisting of living and non-living environments that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system.

Biotic vs. Abiotic Factors

Q. Which trophic level is incorrectly defined?
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 13
Omnivores consume both plant and animal matter.

Molds, yeasts and mushrooms are saprophytes that feed on dead and decaying matter.

Case Based Questions Test: Our Environment - 2 - Question 14
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Read the following and answer the questions:

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. An ecosystem is defined as a structural and functional unit of the biosphere consisting of living and non-living environments that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system.

Biotic vs. Abiotic Factors

Q. Consider the following statements concerning food chains:

Which two of the above statements are correct?

(i) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation

(ii) Removal of most of the carnivores resulted in an increased population of herbivores.

(iii) The length of the food chains is generally limited to 3 – 4 trophic levels due to energy loss

(iv) The length of the food chains may vary from 2 to 8 trophic levels
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 14
In a food chain, the carnivores eat up herbivores, or in other words, the secondary consumers consume the primary consumers. So, we can say that if the number of carnivores decreases, the number of herbivores like deer go on increasing as they will not get eaten up. So, the removal of most of the carnivores will result in an increased population of deer.

Apart from this, we also know that as we move from one trophic level to another, the amount of energy goes on decreasing. This is according to the 10% law according to which, at each trophic level, 10% energy is lost. So, each food chain is only 3-4 trophic levels long due to these energy losses.

Therefore, ii and iii are the correct statements.

Case Based Questions Test: Our Environment - 2 - Question 15
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Read the following and answer the questions:

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. An ecosystem is defined as a structural and functional unit of the biosphere consisting of living and non-living environments that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system.

Biotic vs. Abiotic Factors

The diagram below shows a food web from the sea shore

Q. The mussel can be described as
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 15
In the food web, if we observe the position of mussels with respect to other organisms, we will notice that algae is the primary producer , microscopic animals consume algae and are the primary consumers and mussels are at the next trophic level and are the secondary consumers.

Case Based Questions Test: Our Environment - 2 - Question 16
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Read the following and answer the questions:

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. An ecosystem is defined as a structural and functional unit of the biosphere consisting of living and non-living environments that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system.

Biotic vs. Abiotic Factors

Q. Which of the following groups of organisms are not included in the ecological food chain?
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 16
Fungi and bacteria are known as saprophytes. Saprophytes are decay organisms and are responsible for getting dead animals and plants to rot (decompose). They break down the remains into simple chemicals, e.g., nitrates, which contain nitrogen, an important element needed by plants. Without saprophytes the soil would quickly run out of nutrients and the plants would have no food.
Case Based Questions Test: Our Environment - 2 - Question 17
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Read the following and answer the questions:

Biosphere is a global ecosystem composed of living organisms and abiotic factors from which they derive energy and nutrients. An ecosystem is defined as a structural and functional unit of the biosphere consisting of living and non-living environments that interact by means of food chains and chemical cycles resulting in energy flow, biotic diversity and material cycling to form a stable, self-supporting system.

Biotic vs. Abiotic Factors

Q. The given figure best represents:
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 17
Food chain in an ecosystem is defined as the passage of food from one trophic level to the next higher trophic level. The transfer of food from one trophic level to the next level results in the passage of energy through these trophic levels. In a Grassland food chain, the initial organisms are grass. They are producers which produce food using solar energy. Insects are primary consumers. They eat plants. They are herbivores. Frog are secondary consumers. They eat insects. They are carnivores. Snake are tertiary consumers. They are carnivores and eat frogs.
Case Based Questions Test: Our Environment - 2 - Question 18
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Read the following and answer the questions:

Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers.

Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

Q. If 10,000 J solar energy falls on green plants in a terrestrial ecosystem, what percentage of solar energy will be converted into food energy?
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 18
falling on it into food

These are the producers or autotrophs

Then there are Primary consumers, Secondary consumers and Tertiary consumers in the food chain

In each of these step only 10% energy is transferred but from sun to the plants only 1% of the energy is converted into food

Thus, if 10,000 J of solar energy falls on green plants in a terrestrial ecosystem, the energy converted into food energy will be

= 1% of 10000 J

= 10000/100 J

= 100 J

Case Based Questions Test: Our Environment - 2 - Question 19
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Read the following and answer the questions:

Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers.

Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

Q. Matter and energy are two fundamental inputs of an ecosystem. Movement of
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 19
Unidirectional flow of energy and cycling of nutrients are the two most basic characteristics of all ecosystems. In most of the natural ecosystems energy comes from the sun, it is trapped by producers and then passed on to successive trophic levels in the form of food. Thus, along the food chain, there is a loss of energy and only 10 percent of the energy available at each trophic level is passed on to the next trophic level.
Case Based Questions Test: Our Environment - 2 - Question 20
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Read the following and answer the questions:

Food chains are very important for the survival of most species. When only one element is removed from the food chain it can result in extinction of a species in some cases. The foundation of the food chain consists of primary producers.

Primary producers, or autotrophs, can use either solar energy or chemical energy to create complex organic compounds, whereas species at higher trophic levels cannot and so must consume producers or other life that itself consumes producers. Because the sun's light is necessary for photosynthesis, most life could not exist if the sun disappeared. Even so, it has recently been discovered that there are some forms of life, chemotrophs, that appear to gain all their metabolic energy from chemosynthesis driven by hydrothermal vents, thus showing that some life may not require solar energy to thrive.

Q. Mr. X is eating curd/yogurt. For this food intake in a food chain he should be considered as occupying
Detailed Solution for Case Based Questions Test: Our Environment - 2 - Question 20
Mr. X eating curd/yoghurt should be considered as occupying the third trophic level. Producers or green plants (first trophic level) are consumed by herbivores (second trophic level) and from them curd/yoghurt (made from daily breed) is consumed by third trophic level organisms like man.
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