What is the name given to certain material which can be break down into smaller fragments in the presence of water, sun light and oxygen and by bacteria?

What is the name given to plastics which are molded once can't be softened by heating?

A list of things in a house are given in table 2. Name the materials from which each object may possible be made of: (If you don't know which material the objects is made of, discuss with your friends and find out.) How many types of material can be used for making chairs?

A small bulb is placed at the bottom of a tank containing water to a depth of 80 cm. What is the area of the surface of water through which light from the bulb can emerge out ? Refractive index of water is 1.33. (Consider the bulb to be a point source.)

Fragmentation, leaching and catabolism are some of the important steps of decomposition Study the following statemetns (i), (ii) and (iii) regarding these and select the correct option. i) Detritivores (e.g., earthworm) break down detritus into smaller particles. ii) Water soluble inorganic nutrients go down into soil horizon and get precipitated as unavailable salts. iii)Decomposers (e.g., bacteria and fungi) excrete digestive enzymes and degrade detritus into simpler inorganic substances.

Here some materials are given. Name the materials from which each object may possibly made up of door , towel, bicycle, knife, mirror, shoes, water bottle, pot.

What are the materials required for the experiment to show the chemical decomposition of water? Write the procedure of the experienment. Name the products which we get in this reaction.