08. Give reason for the following:
A. Petroleum has taken millions of years to form.
b. Aluminium is used in building ships.
c. Leguminous crops are grown at regular intervals.
d. Pickles do not spoil easily
e. A bowler rubs the cricket ball on his/her clothes during cricket match.
Answers
A.
→ Like coal and natural gas, petroleum was formed from the remains of ancient marine organisms, such as plants, algae, and bacteria. Over millions of years under high pressure and high temperature, the remains of these organisms transformed into what we know today as fossil fuels.
B.
→ Aluminium alloys can replace carbon steels of normal strength. The weight saved by using Al alloys improves the ship stability – and allows the design of narrower ships, which in turn enhances fuel efficiency.
C.
→ Leguminous crops are grown at regular intervals of cropping because it helps in improving the fertility of soil by the fixation of oxygen.
D.
→ Jams and Pickles do not spoil easily because they are added with preservatives. sugar is added in jams and edible oils are used in pickles. sugar and edible oil keeps a check on the growth of the bacteria thatmight grow and make the substance toxic or spoil it.
E.
→ The bowlers and fielders rub the ball to make the ball smooth and shiny on one side and leave it rough on the other side.