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प्रश्न
| A food chain consists of fish, larvae, phytoplanktons and birds. The level of pesticides in water in which the fish, larvae and phytoplanktons live is quite high. |
- In which organisms the pesticides enter from the polluted water? What is this level of organisms known as?
- Which organism will have the maximum amount of pesticides accumulated through the food chain? What is this process known as?
- Write the food chain comprising all the organisms mentioned above.
- Which other organism you could write in place of bird in the above food chain?
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उत्तर
- Pesticides enter phytoplankton from polluted water. They are producers (autotrophs) and belong to the first trophic level.
- The bird will have the highest pesticide levels accumulated through the food chain. This process is known as biological magnification (biomagnification).
- Phytoplankton → Larvae → Fish → Bird
- Man (Human being).
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संबंधित प्रश्न
The first trophic level in a food chain is always a green plant. Why ?
Which of the following constitute a food-chain?
What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?
Which of the following belong to the same trophic level?
Goat ; Spider ; Plants ; Hawk ; Rat
Consider the food chain :
Grass → Deer → Lion
What will happen if all the lions are removed from the above food chain?
Construct a short foodchain, ending with man.
Give one example of a simple food chain.
If a grasshopper is eaten by a frog, then the energy transfer will be from ______.
The sea water contains water beetles, tadpole, fish and weeds.
Which organisms are (i) predators, and (ii) prey?
| Some hunters are roaming in the plush green forest of Africa. They spot a deer and kill it. They decide to roast the deer there and then and eat it. When the hunters had just finished enjoying the feast of roasted deer, a lion attacks them. The lion kills one of the hunters and eats his flesh. |
- Write a food chain which provides food to the lion in this case.
- Which animal (other than deer) the lion could look for food if he did not get the hunter as prey?
- Which other animal in the forest could have been in place of lion?
- How does the above food chain differ from the food chain such as: plants → goat → man?
  |
What would happen to the number of grass plants and foxes if the number of rabbits increased?
Fill in the following blank with suitable word :
Grass → ........... → Human
What is meant by bioconcentration of pesticides
Most of the water surface of a lake is covered with algae. This algae is part of the food chain which also includes small fish, bird, larvae and big fish. Which of the following will obtain the maximum energy?
(a) big fish
(b) bird
(c) larvae
(d) small fish
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
Natural agents like ______ are the decomposition factors breaking complex forms into simpler units.
Each level in the food chain is called a ______ level.
Animals that eat both plants and animals are called as Carnivores.
Differentiate between herbivores and carnivores.
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
