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Our Environment Test - 34

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Our Environment Test - 34
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Each successive trophic level has
    Solution
    As energy passes from one trophic level to next trophic level, only a fraction of the energy (10%) is transferred to the next trophic level and rest of the energy is lost as heat during this process.
    The energy flow in an ecosystem is unidirectional means energy flows in one direction, only from producer to consumers and does not come back to the source. Thus, the correct answer is option A.
  • Question 2
    1 / -0
    Which is the best example of interaction of biotic and abiotic factors of ecosystem?
    Solution
    Forests provide excellent introduction to the foundational concepts of ecology, since they are among the most structurally and biologically diverse of the planets ecosystems. Forests are built upon highly complex relationships between living and non-living components. In a forest, abiotic factors include fundamentals such as sunlight, moisture, nutrients, bedrock and topography. Biotic components are the living members of the system. A defining trait of an ecosystem is the cycling of nutrients and energy between organisms and their environment, and it is these abiotic components that provide the foundation for interaction between members of ecological communities. 
  • Question 3
    1 / -0
    Waste must be separated into ________ and _______.
    Solution
    Solid waste that are generated must be segregated as dry waste and wet waste. This would help in better treatment and disposal of waste.
  • Question 4
    1 / -0
    Which one of the following can be considered as an example of secondary consumer?
    Solution
    Secondary consumers are the organisms that feed on primary consumers. 
    • A fish feeding on algae (producer) is a primary consumer. 
    • A hawk is a tertiary consumer that feeds on a mouse (secondary consumer) that feeds on an insect (primary consumer). 
    • A plant that is parasitic on another plant is a primary consumer. 
    • A lion that eats a gazelle (primary consumer) that feeds on grass (producer) is the secondary consumer. 
    • A beetle that feeds on nectar is the primary consumer. 
    So, the correct answer is option D.
  • Question 5
    1 / -0
    In the given food web, an increase in the population of hawks will not result in

    Solution
    A food web represents the feeding relationships within the ecosystem, and it also includes many interconnected food chains.
    In the given food web, the hawk is the top consumer that feed majorly upon lizard, snake, and rabbit. In unavailability of these animals, the hawk feed upon mouse and grasshoppers. If the population of hawk increased, they would feed more on lizard, rabbit, snake, and mouse as they are easily available. This will decrease the population of lizards, rabbits, snakes, and mouse. Grasshoppers are not readily available to hawks as they live within the grass. As a result of this, the population of grasshopper will increase because of less number of predators such as lizards and snakes.
    So the correct option is 'Decrease in the population of grasshoppers'. 
  • Question 6
    1 / -0
    Consider the components of a food chain producers $$ \rightarrow\ $$ herbivores $$ \rightarrow\ $$ carnivores $$ \rightarrow\ $$ top carnivores. Eventually what happens to all the energy passed from one element to the next?
    Solution
    A food chain can be described as a series of energy dilutors, the energy that fails to reach the next level being dissipated as heat or movement. Most of the energy contained in the food of animal consumers is used by them during the processes of food collection, digestion, and other essential metabolic activity.
    So, the correct option is 'It is dissipated into the environment.'
  • Question 7
    1 / -0
    Read the following statements carefully:
    (I) Energy transfer in the biotic world always proceeds from the autotrophs.
    (II) Energy flow in unidirectional.
    (III) Energy availability is maximum at the tertiary level.
    (IV) There is a loss of energy from one trophic level to the other.

    Select the relevant statements for a forest ecosystem.
    Solution
    A forest ecosystem is formed by the community of organisms which live in a forest. The relevant statement for the forest ecosystem are:
    • Energy transfer in the biotic world always proceeds from the autotrophs as the plants and the trees are the major producers. 
    • Energy flow is unidirectional.
    • There is a loss of energy from one trophic level to the other as the law of energy transfer is applicable to this ecosystem.
    So, the correct answer is option A.
  • Question 8
    1 / -0
    As DDT passes into food chain, the concentration:
    Solution

    • DDT (Dichlorodiphenyltrichloroethane) is an organochlorinated compound that is stable in nature. The level of DDT increases as the food chain progresses.
    • It means, the primary consumers will have more DDT concentration than the producers, the secondary consumers will have more than primary consumers and so on. 
    • The highest concentrations will be seen in the top carnivore. As the consumers at each successive trophic level consume more food to fulfil their energy requirements. 
    • Therefore, DDT accumulates in higher concentrations in successive trophic levels. This process is called biomagnification.
    Hence, the correct answer is 'Increases'.
  • Question 9
    1 / -0
    Which of the following statements about food chains are correct?
    (a) Removal of 80% of tigers resulted in increased growth of vegetation.
    (b) Removal of most carnivores resulted in an increased population of deer.
    (c) Length of the food chain is limited to 3-4 trophic levels due to energy loss.
    (d) Length of the food chain may vary from 2-3 trophic levels.
    Solution
    • 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 tropic 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 tropic levels long due to these energy losses.
    Therefore, b and c are the correct statements.
    So, the correct option is C.
  • Question 10
    1 / -0
    Read the following statements and choose the correct set of option w.r.t. ecosystem.
    I. Various ecosystems are interconnected by the flow of energy and the transfer of materials.
    II. It is a self-sustained and self-regulated segment of nature.
    III. Energy flow is always cyclic while the flow of nutrients is unidirectional.
    IV. Density of the ecosystem is governed by the degree of biogeochemical cycling and the amount of nutrients.
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