Leghaemoglobin is ________

(a)

Oxygen scavenger in BGA

(b)

Oxygen, scavenger in Rhizobium

(c)

Oxygen scavenger in legume

(d)

scavenger in all nitrogen fixers

A plant which is being researched as cleaning agent for polluted waters  ________

(a)

Pongamia

(b)

Withania

(c)

Lemon

(d)

Moringa

________ is a mineral required  greatest  amount by plants.

(a)

P

(b)

K

(c)

N

(d)

Mg

Kheira disease of Rice is caused due to deficiency  of  __________

(a)

Mo

(b)

Zn

(c)

B

(d)

O

The criteria for essential minerals was given by ___________

(a)

Van Helmont

(b)

Arnon

(c)

Sachs

(d)

Liebig