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प्रश्न
A student went to study a local pond. In one part of the pond she noticed tadpoles scraping at some pond weed. 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?
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उत्तर
Weed→ Tadpole → Water beetle
There are three links in this food chain
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संबंधित प्रश्न
Give reason to justify the following: Flow of energy in a food chain is unidirectional.
The first trophic level in a food chain is always a green plant. Why ?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
Which of the following constitute a food-chain?
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
At which trophic level a person is feeding when he is eating bread.
At which trophic level a person is feeding when he is eating apple.
What is a 'food web'? Show its formation.
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 |
In a food chain, the third trophic level is always occupied by :
(a) carnivores
(b) herbivores
(c) decomposers
(d) producers
Organisms which synthesise carbohydrates from inorganic compounds by using radiant energy are called ______.
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?
Name and state the law given by Lindeman which tells us how much energy entering a particular trophic level of organisms is available for trasnsfer to the next higher trophic level.
In the food chain given below, if the amount of energy available at fourth trophic level is 5 kJ, what was the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
(a) 500 kJ
(b) 50 kJ
(c) 5000 kJ
(d) 5 kJ
An aquatic food chain comprises of the organisms like tadpoles, weeds, fish and water beetles. The organism which gets the minimum energy through this food chain is :
(a) water beetles
(b) tadpoles
(c) weeds
(d) fish
"Energy flow in food chains is always unidirectional". Justify this statement. Explain how the pesticides enter a food chain and subsequently get into our body.
Assertion (A): The energy which passes to the herbivores does not come back to autotrophs.
Reason (R): The flow of energy in a food chain is unidirectional.
