14. Name the gas released from the landfill sites.
15. What do you mean by acclimatization?
16. Why is silvered glass used as a mirror?
17. What do you mean by camouflage?
18. What is slithering?
19. What is known as 'Lungs of the world'.
20. What are blue-coloured bins used for?
Answers
Answer:
14.Methane and carbon dioxide make up 90 to 98% of landfill gas. The remaining 2 to 10% includes nitrogen, oxygen, ammonia, sulfides, hydrogen and various other gases. Landfill gases are produced when bacteria break down organic waste.
15.Acclimatization, any of the numerous gradual, long-term responses of an organism to changes in its environment. Such responses are more or less habitual and reversible should environmental conditions revert to an earlier state.
16.Because silver is a shiny and is a good reflector .. It reflects about 90 percent of light falling on it ,,That is why, it is used for making high reflecting mirrors ... One surface of the mirror is silvered because it helps the light rays to reflect.
17.Camouflage, also called cryptic coloration, is a defense or tactic that organisms use to disguise their appearance, usually to blend in with their surroundings. Organisms use camouflage to mask their location, identity, and movement. This allows prey to avoid predators, and for predators to sneak up on prey.
18. to slide down or along a surface, especially unsteadily, from side to side, or with some friction or noise: The box slithered down the chute. to go or walk with a sliding motion: The snake slithered across the path.
19.Tropical rainforests are often called the “lungs of the planet” because they generally draw in carbon dioxide and breathe out oxygen. But the amount of carbon dioxide they absorb, or produce, varies hugely with year-to-year variations in the climate.
20.Blue coloured bins are used for collecting materials that are recyclable. The recyclable materials include paper- newspaper, magazines, etc., cardboard, food tins, glass bottles and jars, plastic bottles, tetra pack packaging, etc.