Question

Match column I with column II and select the correct option from the codes given below.

Column I	Column II
(a) Rhizobium	(i) Nitrogen fixation
(b) Organic manure	(ii) Separation of grains from chaff
(c) Threshing	(iii) Sowing of seeds
(d) Seed drill	(iv) Animal excreta, cow dung and plant wastes
(e) Leguminous plants	(v) Root nodules

• A. a- (i), b- (iv), c- (ii), d- (iii), e- (v)
• B. a- (v), b- (iv), c- (iii), d- (ii), e- (i)
• C. a- (iv), b- (i), c- (iii), d- (ii), e- (v)
• D. a- (i), b- (v), c- (ii), d- (iii), e- (iv)

Answer 1

The correct option is A a- (i), b- (iv), c- (ii), d- (iii), e- (v)

Rhizobia are soil bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes (Fabaceae). Organic manure covers manure made from cattle dung, excreta of other animals, rural and urban composts, other animal wastes, crop residues and green manures. Threshing is the process of loosening the edible part of cereal grain (or another crop) from the scaly, inedible chaff that surrounds it. It is the step in grain preparation after harvesting and before winnowing, which separates the loosened chaff from the grain. A seed drill is a sowing device that precisely positions seeds in the soil and then covers them. Before the introduction of the seed drill, the common practice was to plant seeds by hand.