Question

Q18 or 19 plzz help me any one I don't know answers

Answer 1

Hey buddy.
The answer to question no 18 is
Definition of crop rotation
the growing of different crops in succession on a piece of land to avoid exhausting the soil and to control weeds, pests, and diseases.
Benefits for crop rotation
-Prevents soil depletion.
-Maintains soil fertility.
-Reduces soil erosion.
-Controls insect/mite pests.
-Reduces reliance on synthetic chemicals.
-Reduces the pests' build-up.
-Prevents diseases.
-Helps control weeds.

Advantage of fixing a leguminous crop between two grain crops is - it helps in the nitrogen fixation of the soil







The answer to question no 19 is....
(a) functional group is alcohol as OH is attached.
IUPAC naming - Ethanol ( as we use eth for 2 carbon atoms and ol for OH group)
(b) functional group is ketone as O is attached to the central atom.
IUPAC naming - propanone ( as we use prop for 3 carbon atoms and one for ketone group)

I hope this will help and you will mark it as brainliest