E. Answer the following questions in one word.
[12]
23. What causes friction?
24. What principle do ball bearing work on?
25. Name the nitrogen fixing bacteria in root nodules of leguminous plants.
26. Why did IUCN prepare the Red Data Book?
27. Name a metal which is liquid at room temp.
28. What is the process of burning of substances with the evolution of heat and light called?
Answers
Answer:
1.Friction is a force that resists the relative motion between two objects or materials. The causes of this resistive force are molecular adhesion, surface roughness, and deformations. Adhesion is the molecular force resulting when two materials are brought into close contact with each other.
2.rolling friction
Answer: Ball bearing works on the principle of rolling friction. Ball bearing contains steel balls or rollers. It is used between the wheels and axle of a car to reduce friction.
3.Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions.
4.The IUCN maintains a Red Data Book which contains a record of animals which are known to be in danger. It includes endangered, vulnerable, rare, extinct etc. species of plants and animals. It helps to create awareness about the various species.
5mercury
Answer: The metal which exist as a liquid at room temperature is mercury.
6.The process of burning of substances with the evolution of heat and light is called combustion.
Explanation:
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Answer:
23) Irregularities between 2 surfaces
24) Rolling Friction
25) Rhyzobium
26) To create awareness about the present numbers of wildlife and provide a systematic information on it.
27) Mercury
28) Combustion