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प्रश्न
Write down a food chain in the sea.
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उत्तर
Algae →Protozoa →Small fish → Large fish
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संबंधित प्रश्न
We do not clean natural ponds or lakes but an aquarium needs to be cleaned regularly. Why is it so ? Explain.
Will the impact of removing all the organisms in a trophic level be different for different trophic levels? Can the organisms of any trophic level be removed without causing any damage to the ecosystem?
What is biological magnification?
In the following food chain, 20,000 J of energy was available to the plants. How much energy would be available to man in this chain?
Plants → Sheep → Man
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Write down a food chain with five links in it.
A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. In another part she saw a water beetle holding a tadpole in its jaws.
(a) Construct a food chain for the pond.
(b) How many links are there in this chain?
Which of the following represents a possible food chain found in a pond :
| Primary producers |
Primary consumers | Secondary consumers |
| (a) green algae | fish | mosquito larvae |
| (b) fish | green algae | mosquito larvae |
| (c) mosquito larvae | fish | green algae |
| (d) green algae | mosquito larvae | fish |
Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
Which of the following statement is incorrect?
The sea water contains water beetles, tadpole, fish and weeds.
Which organism is a secondary consumer?
Which common pesticide has accumulated in human body in considerable amounts?
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?
Which of the following is a logical sequence of food chain?
Observe the food web and answer the questions given below:
Why do all food chains start with plants?
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
The food chain begins with the energy given by the ______.
Define – Heterotrophs.
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
