A farmer was using pesticides on his farm. He used the produce of his farm as food for rearing fishes, He was told that fishes were not fit for human consumption because large amount of pesticides had accumulated in the tissues of fishes. Explain how did this happen ?

A farmer is fed up of weeds in his Wheat farm. Which of the following chemicals he can use to overcome the problem?

A farmer is growing a crop regularly in his field. He uses chemical fertilizers, pesticides, organic manure as well as bio-fertilizers. Very close to his field is a factory which emits smoke as a by product. There is also a huge lake in the nearby area. Which of these is a way to prevent accumulation of harmful chemicals in our bodies ?

A farmer is growing a crop regularly in his field. He uses chemical fertilizers, pesticides, organic manure as well as bio-fertilizers. Very close to his field is a factory which emits smoke as a by product. There is also a huge lake in the nearby area. Consider the following food chain in the same lake. Aquatic plant to Small fish to Big fish to Birds Which of the above organisms is likely to show minimum amount of pesticide concentration in them after considerable time?

Passage I was very fond of the old soldier in our little town. He had only one leg, having lost the other somewhere in Assam in 1942. He used to tell me about his adventures. He told me that he had run away from home to join the army. He had experienced his first battle in the Libyan desert. Out of his dozens of war stories, the one I liked best was the one of his escape from a Japanese prison-of-war camp in Burma. He told me again and again how he walked Iwo hundred miles in two weeks. On the way he was bitten on the toe hy a poisonous snake and he had to cut off part of the toe in order to survive. But by the time he got to an Indian camp the wound had tumed septic and the leg had to be amputated. He is, however, quite contented with his lot. Why did the old soldier repeatedly tell that he walked two hundred miles ?