Mineral Nutrition

If by radiation all nitrogenase enzymes are inactivated, then there will be no

1. fixation of nitrogen in legumes
2. fixation of atmospheric nitrogen
3. conversion from nitrate to nitrite in legumes
4. conversion from ammonium to nitrate in soil.

Plants deficient of element zinc, show its effect on the biosynthesis of plant growth hormone

1. auxin
2. cytokinin
3. ethylene
4. abscisic acid.

Gray spots of oat are caused by deficiency of

1. Cu
2. Zn
3. Mn
4. Fe

Boron in green plants assists in

1. activation of enzymes
2. acting as enzyme co-factor
3. photosynthesis
4. sugar transport

Enzyme first used for nitrogen fixation

1. nitrogenase
2. nitroreductase
3. transferase
4. transaminase

Passive absorption of minerals depends on

1. temperature
2. temperature and metabolic inhibitor
3. metabolic inhibitor
4. humidity

Roots of which plant contain a red pigment which has affinity for oxygen?

1. Carrot
2. Soybean
3. Mustard
4. Radish

Mg is a component of

1. chlorophyll
2. cytochrome
3. haemoglobin
4. haemocyanin

Plants take zinc in the form of

1. ZnSO4
2. Zn2+
3. ZnO
4. Zn

When the plants are grown in magnesium deficient but urea rich soil, the symptoms expressed are

1. yellowish leaves
2. colourless petiole
3. dark green leaves
4. shoot apex dies