13. What is Biological Magnification? If the concentration of DDT / 0.2 ppm in the
water of a lake, what will be its concentration in the big fish in the following food
chain: Algae, Zoo Plankton, small fish, big fish.
Answers
Answer:
ANSWER
DDT (Dichlorodiphenyltrichloroethane) is an organochlorinated compound that is stable in nature. It is highly soluble in the fats of the living organism and so, it shows persistence in the food chain. It is seen that the level of DDT increases as the food chain progresses. It means, the primary consumers will have more DDT concentration than the producers, the secondary consumers will have more than primary consumers and so on. The highest concentrations will be seen in the top carnivore. This is because the consumers at the successive trophic level consume more than the previous level to fulfil the energy requirements. Due to this, DDT keeps on accumulating in the successive trophic levels in higher concentrations. This process is called the biomagnification.
0.003 ppb in water, 0.04 ppm in zooplankton, 0.5 ppm in small fish, 2 ppm in large fish, 25 ppm in large fish eating bird.
Hence, the correct answer is '25 ppm'
Answer:
Biomagnification also known as bioamplification or biological magnification, is any concentration of a toxin, such as pesticides, in the tissues of tolerant organisms at successively higher levels in a food chain.
Explanation:
organism higher in the food chain consume DDT every time they feed on an organisms lower down in the food chain,if they're contaminated with DDT.
The bio mass at each level food chain get less, so the concentration of the DDT will increase.
The increase in concentration of pesticides in a food chain is called biomagnification.
DDT concentration-
producer (plankton 0.2 ppm)... primary consumer (fish 1.0)... secondary consumer fish eating birds (5.0ppm)
Based on the above explanation ,we can say that DDT become concentrated in tissues of the organisms of the three successive trophic level in the food the process of concentration goes right on up food chainfrom one trophic level to next.