Which one of the following is not a microelement for plants?
Cu
B
Zn
Cr
D.
Cr
Plants require many organic and inorganic nutrients to complete their life-cycle. It has been established that some elements are required by plants in relatively large amount and are called major elements or macronutrients, e.g., Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), Sulphur (S), Phosphorus (P), Potassium (K), Calcium (Ca) and Magnesium (Mg).
Microelements or minor elements or trace elements are required by plants in very small amount, less than 1 ppm. eg. Iron (Fe), Copper (Cu), Boron (B), Zinc (Zn), Manganese (Mn), Molybdenum (Mo), Chlorine (Cl). Thus Chromium (Cr) is not a microelement.
Which of the following is correct set of micronutrient for plants?
Mg, Si, Fe, Cu, Ca
Cu, Fe, Zn, B, Mn
Mg, Fe, Zn, B, Mn
Mo, Zn, Cl, Mg, Ca
Assertion : Plants absorb sulphur in the form of sulphate ions.
Reason : Sulphur bacteria are required for the formation of sulphate.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
In the given diagram A and B represent
| A | B |
| Mineralisation | Demineralisation |
| A | B |
| Ammonification | Denitrification |
| A | B |
| Denitrification | Ammonification |
| A | B |
| Denitrification | Mineralisation |
Leghaemoglobin helps in
imparting colour to floral petals
protecting nitrogenase from O2
destroying bacteria
transport of food in plants
The function of leghaemoglobin during biological nitrogen fixation in root nodules of legumes is to
convert atmospheric N2 to NH3
convert ammonia to nitrite
transport oxygen for activity of nitrogenase
protect nitrogenase from oxygen
