Q.6 what are the advantages of using CNG and LPG as fuels?
Q7 What are weeds? How can we control them?
Answers
Answer:
Ans.6:
The advantages of using Compressed Natural Gas(CNG) and Liquified Petroleum Gas(LPG) as fuels are :
i) They can be easily transported by cylinders or pipelines.
ii) They are easily available.
iii) They have low prices.
iv) They are more efficient than other fossil fuels.
v) They are clean fuels and do not give smoke when burnt as compared to coal which releases smoke.
vi) They give a lot of heat energy when burnt as compared to other fuels like kerosene, coal, etc
Ans.7:
The undesirable and unwanted plants which grow naturally along with crops are called weeds. The growth of weeds can be controlled by adopting many ways. Tilling before sowing of crops helps in the uprooting and killing of weeds. Which may dry up and get mixed with soil. Weeds are also controlled by using certain chemicals, called weedicides. Weedicides are sprayed in the fields to kill the weeds.