Our environment Worksheet-8
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With the help of arrows depict the aquatic (in a pond) food chain.
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What is a 'decomposer'?
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Write the food chain of a non-vegetarian.
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Name the organism belonging to the 4th trophic level in the food chain comprising the following: Snakes, Insects, Frogs, Plants, Hawks.
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Which one of the following is not a terrestrial ecosystem : Forest, Grassland, Aquarium, Desert
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Arrange the following in a food chain :
(a) Frogs, Insects, Birds, Grass.
(b) Fish, Algae, Small Animal, Big Fish.
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State one reason to justify the position of man at the apex of most food chains.
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Name the process in which harmful chemicals enter food chain and get concentrated more and more at its each successive trophic level of organism.
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What are those animals called who depend upon only plants for their food?
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If a harmful chemical enters a food chain comprising snakes, hawks, mice and plants, which of these organisms is likely to have maximum concentration of the harmful chemicals in its body?
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What are planktons?
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Name the organisms belonging to the second and fourth trophic levels in the food chain comprising the following : Frogs, Plants, Snakes, Hawks, Insects.
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Construct a food chain comprising the following: Snakes, Hawks, Rats, Plants.
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In a food chain comprising of lion, grass and deer, which one will transfer maximum energy to the next trophic level?
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Identify the organism belonging to the third trophic level, by constructing a food chain, comprising the following organisms : Snake, Mice, Hawk, Plants.
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Define an ecosystem.
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Define trophic level.
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What are producers? Give suitable examples.
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What is the functional unit of environment comprising of the living and non-living components called?
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What are the various steps of a food chain called?
Answer:
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Phytoplanktons → Zooplanktons → Small fishes → Large fishes.
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Group of micro-organisms that breaks the complex dead organic matter into simpler substances by a natural process is called decomposers.
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Grass → Goat → Man.
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Snakes.
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Aquarium.
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(a) Grass → Insects → Frogs → Birds.
(b) Algae → Small animals → Small fishes → Big fishes.
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Man is omnivorous and due to the power that he yields over other animals he is very rarely eaten by other animals. Also, he disposes the dead ones in such a way that they cannot be eaten by scavengers.
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Biological concentration or biomagnification.
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Herbivores (I order consumers).
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Hawks.
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Planktons are very minute microscopic organisms freely floating on the surface of water in a pond, lake, river or ocean.
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Insects belong to second trophic level and snakes belong to fourth trophic level.
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Plant → Rats → Snakes → Hawks.
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Grasses will transfer maximum energy to deer.
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Snake: Plants → Mice → Snake → Hawk.
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A functional and self-sustaining unit comprising of living and non-living components in which there is a constant interaction between the two is an eco-system.
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The various steps of a food chain through which energy is transferred to the successive levels in the form of food is called trophic level.
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Producers are green plants, that can transform solar energy into chemical energy by the process of photosynthesis, e.g., Grass, Algae.
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Ecosystem.
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Trophiclevels.