Question

give correct answer then I give her brilliant list​

Answer 1

3) i) Name the practice followed for large scale rearing of farm animals.

→ animal husbandry

The practice followed for large scale rearing of farm animals is known as animal husbandry. In simple words, animal husbandry refers to raising or keeping livestock (domestic animals) for farm purpose use or for profit by selling them.

ii) What facilities are provided to farm animals ?

→ Facilities provided to the farm animals are:

• They are well maintained.
• They are provided fodder on time with proper required nutrients for the animals.
• They are kept clean.
• Care is taken especially about their health.

4) What do you mean by symbiotic relationship ?

→

• the living together in more or less intimate association or close union of two dissimilar organisms (as in parasitism or commensalism) especially : mutualism.
• a cooperative relationship (as between two persons or groups) the symbiosis

5) What is 4R principle ?

→ The 4R means Reduce, Reuse, Recycle and Restore.

6) Sodium metal is kept in kerosene but not in water. why ?

→ Sodium is a highly reactive metal and reacts vigorously with the oxygen, carbon dioxide and moisture present in the air such that it may even cause a fire. To prevent this explosive reaction, Sodium is kept immersed in kerosene because Sodium doesn't react with kerosene.

7) Which zone of a flame does a goldsmith use for melting gold and silver and why ?

→ The goldsmith uses the outermost zone of the flame to use for melting gold and silver because it is the hottest part of the flame and undergoes complete combustion.

8) Crackers on ignition produce sound. Why ?

→ Crackers on ignition produce rowdy sound. This is happens due to the chemical reaction that takes place when the cracker is ignited. It is due to the reason that when the gunpowder is suppressed in any way then the gas present in it is released with a large popping sound.

9) Explain why chloroplasts are found in only plant cells ?

→ Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps sunlight and uses it to prepare food for plants by the process of photosynthesis.