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प्रश्न
What is a trophic level?
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उत्तर
Trophic levels are the feeding positions of organisms within a food chain, with producers at the base, followed by herbivores and successive levels of carnivores. Each level represents a stage in the transfer of energy and food. An organism can occupy multiple trophic levels depending on what it eats.
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संबंधित प्रश्न
A food chain represents a unidirectional flow of X. What is X?
Explain the terms 'producer' and 'consumer'. Give two examples of producers and two of consumers.
Construct a long food chain.
What is a food 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 of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the ______.
Which of the following statement is incorrect?
In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect
(b) snake
(c) frog
(d) grass
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms can trap solar energy to make food?
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
Name one phytoplankton.
What would happen to the number of rabbits and grass plants if the number of foxes increased?
What would happen to the number of grass plants and foxes if the number of rabbits decreased?
Match the terms given in column I with the terms given in column II and column III having the same meaning :
| Column I | Column II | Column III |
| (1) Secondary consumer | Herbivore | 1st trophic level |
| (2) Primary consume | Autotroph | 3rd trophic level |
| (3) Producer | Carnivore | 4th trophic level |
| (4) Tertiary consumer | Large carnivore | 2nd trophic level |
Name two predators of snakes in a food web operating in a forest ecosystem.
Will the levels of biological magnification be different at different levels of the ecosystem?
Calculate the amount of energy that will be available to big fish in the following food chain, if 10,000 J of energy is available to small algae from the sun :
Small algae → Zooplankton → Fish → Big fish
What percentage of sun's energy falling on the leaves of green plants is utilised by the plants in the process of photosynthesis and stored as chemical energy of food?
(a) 99 per cent
(b) 10 per cent
(c) 1 per cent
(d) 20 per cent
Which of the following gets the minimum energy through the food chain in an ecosystem?
(a) carnivore
(b) large carnivore
(c) producer
(d) herbivore
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
Arrange the following in a correct sequence and form a food chain
Rabbit → Carrot → Eagle → Snake
Give one example of a food chain in an aquatic ecosystem?
______ obtained energy from the chemical breakdown of dead organisms.
The sequence of who eats whom in an ecosystem is called as ______.
In a food chain grasshopper gets energy by eating frog.
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, vertical arrows indicate the energy lost to the environment and horizontal arrows indicate energy transferred to the next trophic level. Which one of the three vertical arrows (A, C and E) and which one of the two horizontal arrows (B and D) will represent more energy transfer? Give reason for your answer.
A food chain in a forest ecosystem
Use of several pesticides which results in excessive accumulation of pesticides in rivers of ponds, is a matter of deep concern. Justify this statement.
