Question

A non-biodegradable toxic chemical has entered into the food chain. Which type of food habit will you suggest to a man, vegetarian or non-Vegetarian ? Explain with the help of a food chain. The food chain which you would suggest, is advantageous in another aspect. How ?

Answer 1

Vegetarian food chain will be suggested in case of entry of non-biodegradable toxic chemical into the food chain. Non-biodegradable chemical gets concentrated at every trophic level by the process of biological concentration. As the concentration increases with the number of trophic level in a food chain, man will get high concentration of the chemical in non-vegetarian food chain than in a vegetarian food chain. Example :  

Vegetarian food chain :

Plants → Man

5PPM      ZOPPM

of DDT     of DDT

Non-vegetarian food chain :

Plants → Goat → Man

5 PPM   240 PPM  1500 PPM

of DDT    of DDT       of DDT

Vegetarian food chain is advantageous in terms of energy available to man because it has less number of trophic level. As 90% of energy is lost to the environment, at every level lesser number of trophic level will result in lesser energy loss.

Answer 2

The vegetarian food chain is suggested.

Explanation:

• The vegetarian food chain can be suggested because the vegetarian food in the form of leaves, fruits, stems, roots, flowers and seeds coming from various  varieties of plants are safe for health.
• The non-vegetarian food like meat, beef, eggs and others are expected to contain toxic chemicals are some of the non-biodegradable wastes are consumed by the animals like fish, chicken, goat and other edible animals these chemicals enter into the food chain and the organisms at the higher trophic level are affected. This phenomena is called as biomagnification.
• The vegetarian food will be free from non-biodegradable wastes and will not cause any harm to organisms of all trophic levels including humans.
• The vegetarian food is the source of protein, carbohydrates, fats, vitamin and minerals all these contents may not be found in the non-vegetarian food.

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