Give reason for the following statements.
a. Raw vegetables and fruits are kept in refrigerator whereas jams and
pickles can be kept outside.
b. Farmers prefer to grow beans and peas in nitrogen deficient soils.
c Mosquitoes can be controlled by preventing stagnation of water
though they do not live in water.
Answers
Answer:(a)Raw vegetables and fruits get easily infected by microorganisms and get spoilt. They are kept in refrigerator as low temperature inhibits growth of microbes. Jams and pickles contain sugar and salt as preservatives. They do not get infected by microbes easily.
(b)Beans and pea are leguminous plants and these assist the growth of Rhizobium bacteria in their root nodules that helps in fixing atmospheric nitrogen. This causes the increase in the nutrients containing nitrogen n the soil and increases its fertility of the soil.
(c)Mosquitos can be controlled by preventing stagnation of water though they don't live in water because mosquitos lay their eggs in stagnated water, they get most nutrients after hatching from water and then they spread diseases like dengue , malaria , chikungunya etc
Hope it helps :)