Biomagnification
Trending Questions
What is intensive farming?
What is biological magnification? Will the levels of this magnification be different at different levels of the ecosystem?
Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
eutrophication
pollution
biomagnification
accumulation
- increased population of fish due to lots of nutrients
- mortality of fish due to lack of oxygen
- increased population of aquatic organisms due to minerals
- drying of the lake due to algal bloom
How can pesticides enter food chain and harm human beings? "I want a long answer for my project"
Major drawback of DDT as a pesticide is that
Organisms at once develop resistance to it
It is significantly less effective than other pesticides.
Its cost of production is high.
It is not easily and rapidly degraded in nature
What is bio magnification and how this affects marine ecosystems?
Which one of the following is not a bioindicator of water pollution?
- Bloodworms
- Sludge worms
- Stoneflies
- Sewage fungus
- Increase in concentration of a toxic substance as they go up the trophic level
- Increase in biomass as we go up the trophic level
- Increase in different organ system as we go up the trophic level
- None of the above
- Increase in the concentration of insecticide in animals
- Increase in the concentration of organophosphate in plants
- Decrease in the concentration of insecticide in animals
- Increase in the number of animals and plants in ecosystem
The increase in non-biodegradable pollutants from one trophic level to the next trophic level along a food chain is called____
- It is significantly less effective than other pesticides
- It’s cost of production is high
- Organisms at once develop resistance to it
- It is not easily and rapidly degraded in nature
- Birds stopped laying eggs
- Earthworms disappeared
- Cobras started feeding on birds
- Many birds eggs did not hatch
- 50 ppm
- 100 ppm
- 25 ppm
- 2 ppm
(i) Mercury accumulated by an organism cannot be metabolised.
(ii) In the process of biomagnification, concentration of DDT is increased at successive trophic levels.
(iii) Accumulation of cadmium can cause thinning of eggshells in birds.
(iv) DDT accumulation is a major cause of a reduced population of fish-eating birds.
(v) Biomagnification occurs only in the aquatic food chain
- (iii) and (v)
- (iii) and (iv)
- (i), (ii) and (iv)
- (i), (iii) and (v)
| I(Organisms) | II(DDT in ppm) | ||
| (a) | Zooplankton | (p) | 0.003 ppm |
| (b) | Small fishes | (q) | 2.0 ppm |
| (c) | Water | (r) | 25.0 ppm |
| (d) | Fish eating birds | (s) | 0.04 ppm |
| (e) | Big fishes | (t) | 0.5 ppm |
- a-s, b-t, c-p, d-r, e-q
- a-s, b-t, c-r, d-q, e-p
- a-s, b-t, c-p, d-q, e-r
- a-q, b-p, c-s, d-t, e-r
Entry of sewage in water caused a spurt in the growth of algae but killed fish due to
Decrease in nutrients
Reduction in light
Depletion of oxygen
All of the above
- Organochlorine insecticides
- Organophosphate pesticides
- Plants and animals in ecosystem with abundant resources
- Photography
- Bioinsecticides
- Biofetilizers
- DDT
- Both A and B
- Biological degradation
- Biological magnification
- Eutrophication
- Bio-geochemical cycle
- Water soluble
- Moderately toxic
- Liposoluble
- Nontoxic to aquatic animals
- Crab
- Eel
- Phytoplankton
- Seagull
- Sea gull
- Phytoplankton
- Eel
- Crab
- produce immunity against mosquitoes
- cause leukemia (blood cancer) in most people
- cause cancer of the intestine
- lead to accumulation of pesticide residues in body fat
