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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
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
A food chain represents a unidirectional flow of X. What is X?
Give an example of a four step food chain operating in grassland. Name the secondary consumer in this food chain
What will happen if we kill all the organisms in one trophic level?
What is the difference between the food habits of organisms belonging to the first and the third trophic levels? Give one example each of the organisms belonging to these two trophic levels.
At which trophic level a person is feeding when he is eating apple.
Write one or two word for the following statement/definition :
Organisms which depend on the producers for food either directly or indirectly
In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
Why are there rarely more than five links (or five organisms) in a food chain?
What is ten per cent law? Explain with an example.
Will the levels of biological magnification be different at different levels of the ecosystem?
Which of the following limits the number of trophic levels in a food chain?
(a) insufficient food supply from producer level
(b) decrease in energy at higher trophic levels
(c) increase in the number of organisms at higher trophic levels
(d) accumulation of harmful chemicals at higher trophic levels
If the energy available at the producer level in a food chain is 150 J, how much energy will be transferred to : tertiary consumer?
(a) 15 J
(b) 10 J
(c) 1.50 J
(d) 0.15 J
In addition to wheat plants, a crop field ecosystem has organisms such as snake, peacock, eagle and mice. If the wheat plants are sprayed with pesticides periodically, which of the following will have the minimum concentration of pesticides in the body?
(a) snake
(b) eagle
(c) mice
(d) peacock
A forest ecosystem having a lot of green plants has some foxes, lions and rabbits in it.
(a) Write a food chain comprising all the four organisms mentioned above.
(b) Name (i) one herbivore, and (ii) two carnivores, in this food chain.
(c) Name the link which is a predator as well as a prey.
(d) Name (i) second trophic level, and (ii) third trophic level.
(e) Which link of this food chain can feed on second trophic level as well as third trophic level, independently?
(f) If the sun provides 1000 J of energy to the plants, then how much energy will be transferred to fox through the food chain.
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
Define – Heterotrophs.
DDT was sprayed in a lake to regulate breeding of mosquitoes. How would it affect the trophic levels in the following food chain associated with a lake? Justify your answer.
In the following food chain, only 2J of energy was available to the peacocks. How much energy would have been present in Grass? Justify your answer.
GRASS → GRASS HOPPER → FROG → SNAKE → PEACOCK
If a harmful chemical enters a food chain comprising peacocks, plants, rats and snakes, which of these organisms is likely to have the highest concentration of the chemical in its body? Justify your answer. Name the process involved and define it.
