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Byju's Answer
Standard IX
Physics
Ecosystem
Energy enters...
Question

Energy enters in a food chain through:


A

Primary consumers

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B

Tertiary organism

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C

Producers

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D

Secondary Organism

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Solution

The correct option is C

Producers


Producers are the photosynthetic organisms which harnesses energy from sun and atmosphere to convert it into organic energy which is then consumed by the primary, secondary and tertiary organism.


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Q.

Energy enters in a food chain through :

(a) primary consumers

(b) secondary consumers

(c) tertiary consumers

(d) producers.

Q. The surface of water in a lake appears green due to a layer of tiny free-floating organisms X on its surface. The lake water also contains organisms like water beetle, fish and tadpole. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.
(a) What could organisms X be?
(b) Write a food chain comprising of all the four organisms mentioned.
(c) What is the general name of the food chains like the one written above?
(d) Name (i) secondary consumer (ii) producer (iii) tertiary consumer, and (iv) primary consumer, in the above food chain.
(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then how much energy was radiated by the sun to the producer?
Q.

Choose the correct one from the following statements

1. Each organism occupies one trophic level in a food chain.

2. A trophic level in a food chain may be occupied by any of the producers, herbivores, carnivores or decomposers

3. Top consumers in a food chain generally feed on secondary consumers.

4. GFC and DFC are the common food chains and the latter is having maximum energy than the first


Q. In the following food chain who gets less energy than the tertiary consumer and more than the primary consumer?
Q. (a) What are producers, primary consumers, secondary consumers and tertiary consumers? Give one example of each.
​(b) Write a food chain having four trophic levels. Mark the producer and various types of consumers in it.
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