Guava grown in soils with pH ________?

The deficiency of vitamin B-2 is adults causes________?

The structures, which are constructed on the river bed upstream of head regulator. With this clear water enters in canal such structures are called________?

Amount of other products which must be foregone or sacrificed to obtain 1 unit of a specific good is called its________?

the enzyme that destroys vitamin B-1 is________?

A group of soils with same parent material but located at different positions of slope?