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Our Environment Test - 21

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Our Environment Test - 21
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Nutrients present in plants and animals are used again and again with the help of
    Solution
    Bacteria and fungi are considered as the decomposers in the ecosystem. They degrade the biodegradable substances present in the environment for obtaining their food with the help of the specific enzymes. Decomposers also help in maintaining the nutrient pool by adding back various elements like carbon, nitrogen etc. (formed during decomposition) into the nutrient pool to continue the biogeochemical cycles. During the process of decomposition, complex organic compounds are broken down into simple inorganic compounds which go into the soil and are utilised by the plants. As dead remainings of plant and animals are degraded in the process, decomposers act as a cleansing agent of nature. They also add humus to the soil which increases the soil fertility. 
    So, the correct option is A.
  • Question 2
    1 / -0
    Which of the following can be placed in the empty box in the given food web?

    Solution
    The food web is the network of organisms which are connected to each other for food and energy. The food web which is represented in the image shows that plants produce food are eaten by worms which are eaten by the insects. The empty box represents the hen which can feed on the plants and can be eaten by the snakes. 
    Thus, the correct answer is option B. 
  • Question 3
    1 / -0
    Which of the following convert solar energy into chemical energy?
    Solution
    • Green plants convert solar energy into chemical energy to make their own food, during the process of photosynthesis. 
    • Photosynthesis is defined as the process by which plant cells prepare food (carbohydrates) from inorganic raw materials like carbon dioxide (CO$$_2$$) and water in (H$$_2$$O) in presence of sunlight and chlorophyll.
    So, the correct option is C.
  • Question 4
    1 / -0
    Find the odd one out.
    Solution
    Correct Answer: D
    Explanation:

    • In a food chain, spider, lizard, crow belongs to higher tropic levels. These are generally carnivores. 
    • However, honeybees feed on pollen and nectar. Hence they are primary consumers and occupy a different level in the food chain. 
  • Question 5
    1 / -0
    Which of the following shows the correct order in a food chain?
    Solution
    • A food chain is the dependence of one organism on the other for food. 
    • In the mentioned ecosystem, plants are producers as they make their own food by photosynthesis. 
    • Caterpillars are the larvae of butterflies and moths. They eat the plant on which they are laid for their survival. So, they are the primary consumer. 
    • Birds are the predators, who eat the caterpillars. 
    So, the correct option is C.
  • Question 6
    1 / -0
    When we destroy a forest, we destroy:
    Solution
    A forest ecosystem comprises trees, wildlife, and abiotic components. Both plants and animals are dependent on each other for their survival. There are many species that form an integral part of the forest food chain. Trees provide food and shelter whereas, some animals help in the pollination and dispersal of seeds. Thus, when forests are destroyed, it wipes out the entire forest ecosystem. So, the correct option is A.
  • Question 7
    1 / -0
    Which of these is not a natural ecosystem?
    Solution
    • An ecosystem is an organization of biotic and abiotic components where the two interact with each other and maintain an energy balance.
    • Examples of ecosystems are deserts, grasslands, aquatic and tree ecosystems.
    • Crop fields, aquariums, and cities or towns are man-made ecosystems that are not naturally maintained and are either created or maintained by humans.

    So, the correct answer is option C.
  • Question 8
    1 / -0
    Out of the given options, which one has the maximum quantity of energy, after producers
    Solution
    According to the 10% law, the transfer of energy from one tropic level to another tropic level is only 10%. It means, the energy level decreases going up in the ecological pyramid. Therefore, the highest energy occurs in the herbivores as they obtain energy directly from the autotrophs (plants). So, the correct option is C. 
  • Question 9
    1 / -0
    Study the following chain
    Grass $$\longrightarrow$$ Goat $$\longrightarrow$$ Jackal $$\longrightarrow$$ Tiger
    Who among the following can be called predators?
    Solution
    In an ecosystem, plants are called producers. In the given food chain, grasses are producers. 
    Goat depends on the grass for obtaining its food, hence, it is a primary consumer. Jackal preys on the goat and is eaten by the tiger. Here, the jackal is a secondary consumer and the tiger is a tertiary consumer. Since both jackal and tiger prey on or hunt other animals, they are predators. 
    So, the correct option is C.
  • Question 10
    1 / -0
    Which of the following does not have a negative impact on the environment?
    Solution
    Biodegradable substances are substances that are easily decomposed by natural decomposers and therefore, they do not cause harm to the environment. Examples: human and animal excreta, plant wastes. Whereas, non-biodegradable substances are those substances that cannot be decomposed by natural decomposers. They harm the environment. Examples: radioactive wastes, chemical wastes like DDT, aluminium cans, plastics, etc. Thus, the correct answer is option D.
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