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What is natural ecosystem?

Important Questions on Ecosystems and Energy Flow

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The amount of nutrients, such as carbon, nitrogen, phosphorus and calcium present in the soil at any given time, is referred as:
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Biology>Ecology and Environment>Ecosystems and Energy Flow>Ecosystem
The term ecosystem was coined by:
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Biology>Ecology and Environment>Ecosystems and Energy Flow>Ecosystem
Which among the following is not a functional unit of the ecosystem?
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Soil transported by wind is called
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Presence of plants arranged into well-defined vertical layers depending on their height can be seen best in:
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Mention four 'Evil Quartet' which cause depletion of biodiversity.
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Who proposed that ecosystem is the symbol of structure and function of nature?
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Match the trophic levels with their correct species examples in grassland ecosystem.

(a) Fourth trophic level (i) Crow
(b) Second trophic level (ii) Vulture
(c) First trophic level (iii) Rabbit
(d) Third trophic level (iv) Grass

Select the correct option.

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Biology>Ecology and Environment>Ecosystems and Energy Flow>Ecosystem
In relation to Gross primary productivity and Net primary productivity of an ecosystem, which one of the following statements is correct?
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What is humification?
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Describe briefly the biological effects of light on animal reproduction.
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Vertical distribution of different species occupying different levels in a biotic community is known as:
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What is ecosystem? Discuss its different components with specific example of pond as an ecosystem.
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Give a reason for the following.

The equilibrium of a forest ecosystem can be disturbed by the uncontrolled hunting of big predators.

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Define ecosystem.
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Net primary productivity (NPP) in an ecosystem is
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Study the following statements and select the correct ones:
I) In a thermally stratified lake, in winter, the upper layer is known as epilimnion.
II) Animals in a lake that are capable of swimming constitute neuston.
III) The natural interconnections of food chain forms a network called food web.
IV) Energy flow in an ecosystem is unidirectional.
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Among biotic components, the micro consumers are called _____ (scavengers/decomposers).
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In an ecosystem the rate of production of organic matter during photosynthesis is termed as:
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A food chain always starts with_____