An aquatic food chain comprises the organisms like tadpoles, weeds, fish and water beetles. The organisms which get the minimum energy through this food chain is:
(a) water beetles (b) tadpoles (c) weeds (d) fish
(d) fish As fish are in the top trophic level in an aquatic food chain, they get the minimum energy, according to the 10 per cent law.
The sea water contains water beetles, tadpole, fish and weeds.
(a) Write a food chain comprising all the given organisms.
(b) Which organisms in the food chain are (i) herbivore, and (ii) carnivores?
(c) Which organisms are (i) predators, and (ii) prey?
(d) Which organisms can trap solar energy to make food?
(e) Which organism is a secondary consumer?
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 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?
A student went to study a local pond. In one part of the pond, she noticed tadpoles scraping at some pondweed. 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?