How does pesticides enters our food chain?

Q. Biomagnification is the process of chemicals becoming increasingly concentrated in animal tissues as they move up the food chain.

Q. A unicellular animal P having no fixed shape ingests a food particle by forming temporary finger-like projections Q. The food particle is engulfed with a little surrounding water to form a temporary stomach R inside it. The chemicals S from surrounding cytoplasm enter into R and break down food into small and soluble molecules by chemical reactions. The digested food is absorbed directly into cytoplasm by the process T. The undigested food is thrown out of the body by the rupture of a cell organelle U in a process called V.

(a) Name the unicellular animal P.

Q. Scales of fishes and reptiles, feathers of birds, hairs, horns, hooves and nails of animals are all remnants of __________ of the body.

Q. Animal cells store food in the form of