The surface of the 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 beetles, fish, and tadpoles. The sun shines over the lake water and provides energy for the functioning of this lake ecosystem.(a) What could organism X be?(b) Write a food chain comprising 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?
(a) X could be phytoplankton. The surface of the water in a lake appears green due to a layer of tiny free-floating organisms known as phytoplankton.
(b) a food chain comprising of all the four organisms is mentioned below:
Phytoplankton → Tadpole → Water beetle → Fish
(c) 'Aquatic food chain' is the general name of food chains such as the one described above.
(d) (i) In the given food chain, the water beetle is the secondary consumer.
(ii) The phytoplankton is the producer.
(iii) The fish is the tertiary consumer.
(iv) The tadpole is the primary consumer.
(e) If the tertiary consumer gets 0.2 J of energy from the secondary consumer, then the energy radiated from the sun to the producer:
Sun → Phytoplankton → Tadpole → Water beetle → Fish
20,000 J → 200 J → 20 J → 2 J → 0.2 J
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