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 Multiple Choice QuestionsMultiple Choice Questions


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


Insects captured by insectivorous plants fulfil their requirements of

  • enzymes

  • oxygen

  • nitrogen

  • water



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


protect nitrogenase from oxygen

Rhizobium is the nitrogen fixing bacteria present in root nodules of leguminous plants. Roots of a legume secrete chemical attractants flavonoids and betaines. Bacteria collect over the root hairs, release nod factors that causes curling of root hairs around the bacteria, degradations of cell wall and formation of an infection thread enclosing bacteria. The infected cortical cells differentiate and start dividing. It produces swelling of nodules and the infected cells enlarge. Bacteria stop dividing and form irregular polyhedral structures called bacteroids. The host cells develops a pinkish coloured pigment called leghaemoglobin. It is an oxygen scavenger and protects nitrogenase from oxygen. Symbiotic nitrogen fixation requires co-operations of 'Nod' genes of legumes, 'nod' 'nif' and 'fix' genes of bacteria.


Hydroponics is

  • nutrient less culture

  • water less culture

  • soilless culture

  • none of these


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

  • Mn

  • Zn

  • Cu

  • Cu



Which among the following is a rootless plant?

  • Nymphaea

  • Sagittaria

  • Ceratophyllum

  • Vallisneria


Leghaemoglobin helps in

  • imparting colour to floral petals

  • protecting nitrogenase from O2

  • destroying bacteria

  • transport of food in plants


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


The enzyme responsible for atmospheric nitrogen fixation is

  • nitrogenase

  • hydrogenase

  • oxygenase

  • carboxylase


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