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प्रश्न
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.
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उत्तर
- DDT being a non- biodegradable pesticide will enter the food chain from the first trophic level i.e Plankton.
- Non – biodegradable pesticides accumulate progressively at each trophic level. This phenomenon is known as biological magnification.
- HAWK will have the highest level of pesticide.
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संबंधित प्रश्न
The first trophic level in a food chain is always a green plant. Why ?
At which trophic level a person is feeding when he is eating eggs.
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
A food chain occurring in the sea which provides food for many people can be written as :
phytoplankton → zooplankton → X → Y
What could be X?
Give one example of a food chain in an aquatic ecosystem?
Give some examples for Biodegradable and Non-biodegradable waste.
| S. No. | Biodegradable waste | Non-biodegradable waste |
| 1. | Food Waste | Plastic Bottles |
| 2. | ||
| 3. | ||
| 4. | ||
| 5. |
Animals that eat both plants and animals are called as Carnivores.
Analogy:
Primary Consumer: Goat, Cow:: Secondary Consumer: ______.
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.
