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What is a 'food web'? Show its formation.
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In a food chain, the initial organism is usually :
(a) photosynthetic
(b) herbivore
(c) saprophytic
(d) parasitic
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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 |
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Which of the following are decomposers of dead organisms?
| Bacteria | Fungi | Viruses |
| (a) no | yes | yes |
| (b) yes | no | yes |
| (c) yes | yes | no |
| (d) yes | yes | yes |
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In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
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If a grasshopper is eaten by a frog, then the energy transfer will be from ______.
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The decomposers in an ecosystem ______.
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What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
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Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
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Organisms of a higher trophic level which feed on several types of organisms belonging to a number of lower trophic levels constitute the ______.
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Which of the following statement is incorrect?
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Which of the following group of organisms are not constituents of a food chain?
- grass, lion, rabbit, wolf
- plankton, man, fish, grasshopper
- wolf, grass, snake, tiger
- frog, snake, eagle, grass, grasshopper
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In the figure given alongside, the various trophic levels are shown in the form of a pyramid. At which trophic level the maximum energy is available?
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One of the following is not a consumer. This one is :
(a) giraffe
(b) antelope
(c) algae
(d) alligator
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Which of the following is not a producer?
(a) grass
(b) zooplankton
(c) phytoplankton
(d) paddy
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One of the following is a micro-consumer. This one is :
(a) ant
(b) lice
(c) fungi
(d) mosquito
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In the food chain comprising of a snake, grass, insect, and frog, the secondary consumer is :
(a) insect
(b) snake
(c) frog
(d) grass
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The sea water contains water beetles, tadpole, fish and weeds.
Write a food chain comprising all the given organisms.
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The sea water contains water beetles, tadpole, fish and weeds.
Which organisms in the food chain are herbivore, and carnivores?
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The sea water contains water beetles, tadpole, fish and weeds.
Which organisms are (i) predators, and (ii) prey?
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