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 Multiple Choice QuestionsMultiple Choice Questions


Leghaemoglobin helps in

  • imparting colour to floral petals

  • protecting nitrogenase from O2

  • destroying bacteria

  • transport of food in plants


Which one of the following elements is not an essential micronutrient for plant growth?

  • Mn

  • Zn

  • Cu

  • Cu



Hydroponics is

  • nutrient less culture

  • water less culture

  • soilless culture

  • none of these


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


Insects captured by insectivorous plants fulfil their requirements of

  • enzymes

  • oxygen

  • nitrogen

  • water


Which among the following is a rootless plant?

  • Nymphaea

  • Sagittaria

  • Ceratophyllum

  • Vallisneria


The deficiencies of micro-nutrients, not only affects growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport ?

  • Cu, Mn, Fe

  • Co, Ni, Mo

  • Mn, Co, Ca

  • Ca, K, Na



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


Cu, Fe, Zn, B, Mn

Plants require nutrients for proper growth and development. There are 16 elements which are required for plant and are termed as essential elements. They are as follows:

Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N), Phosphorus (P), Sulphur (S), Potassium (K), Magnesium (Mg), Calcium (Ca), Iron (Fe), Copper (Cu), Boron (B), Zinc (Zn), Manganese (Mn), Molybdenum (Mo) and Chlorine (Cl).

The essential elements are categorised into 2 groups, 

  1. Macro- nutrients: These are required by plants in large quantities. eg, C, H, O, N, S, P, K, Ca and Mg.
  2. Micro- nutrients: These are required by plants in very small quantities. eg, Fe, Cu, B, Mn, Ni, Mo and Cl.


Examination of blood of a person suspected of having anaemia, shows large, immature, nucleated erythrocytes without haemoglobin. Supplementing his diet with which of the following is likely to alleviate his symptoms?

  • Thiamine

  • Folic acid and cobalamine

  • Riboflavin

  • Riboflavin



The enzyme responsible for atmospheric nitrogen fixation is

  • nitrogenase

  • hydrogenase

  • oxygenase

  • carboxylase