Biomagnification
Trending Questions
Q.
How does pesticides enters our food chain?
By residue deposition in animal tissues
By storing in animal stomach
By chemicals deposited in nails and feathers
None of the choices
Q.
There is mass mortality of fishes in a pond. What may be the reasons?
Q.
Why are there so many dead fish in Canyon lake?
Q. Described below are the three steps in the process of how eutrophication leads to total destruction of aquatic life. Choose the option which has the correct sequence of these steps.
i) Algae dies, producing a large quantity of organic matter.
ii) Bacteria begin degrading organic matter, leading to a decrease in dissolved oxygen.
iii) Increase in nutrient concentrations causes a sudden growth spurt in algae.
i) Algae dies, producing a large quantity of organic matter.
ii) Bacteria begin degrading organic matter, leading to a decrease in dissolved oxygen.
iii) Increase in nutrient concentrations causes a sudden growth spurt in algae.
- i→iii→ii
- ii→i→iii
- iii→i→ii
- i→ii→iii
Q.
Give reasons: “There is a mass mortality of fish in a pond”.
Q.
Select the measures to control mosquitoes.
Windows of houses should be covered with finely meshed wire nets
Water should be left stagnant
One should sleep within mosquito nets.
Rooms should be sprayed with insecticides.
Q. What caused death of several people and animals like cats, dogs and pigs in the bays of minamata?
- Biomagnification
- Minamata disease
- Eutrophication
- Oil spill
Q. Sort the given organisms based on the amount of DDT concentration.
- Frog
- Peacock
- Snake
- Fish
- Planktons