Q29 / 180 · NEET 2020 (Phase 1) · Botany

Match the following concerning essential elements and their functions in plants

(a) Iron (i) Photolysis of water
(b) Zinc (ii) Pollen germination
(c) Boron (iii) Required for chlorophyll biosynthesis
(d) Manganese (iv) IAA biosynthesis

Select the correct option.

  • A
    (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  • Correct answer
    B
    (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
  • C
    (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
  • D
    (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Solution

Element Biological function
Iron (i) Absorption from acidic soil, because present in the soluble form.
(ii) Iron-porphyrin protein for cytochromes, Peroxidase, Catalases (Photorespiration)
(iii) Important for ferredoxin, biological N2 fixation & ETS.
(iv) Essential role in chlorophyll synthesis.
(v) Necessary for the activity of aconitase enzyme of respiration.
Zinc (i) Specific role in Auxin (IAA) hormone synthesis in cells.
(ii) Activator of carbonic anhydrase, carboxylases, alcohol dehydrogenase, peptidase.
(iii) In seed formation.
Boron  (i) B is the only micronutrient, which is not associated with enzymes.
(ii) Required for uptake and utilization of Ca2+, membrane functioning,
Pollen germination, cell elongation, cell differentiation, and carbohydrate translocation.
(iii) Important for active salt absorption, nodule formation, and flowering or fruiting.
(iv) B is essential in pollen tube formation.
(v) Lethal effect at carbohydrate metabolic site.
Manganese (i) Mn++ is the activator of many enzymes like nitrite reductase, hydroxylamine reductase decarboxylase, dehydrogenase.
(ii) Essential for O2 evolution and photolysis of water in the light reaction
(iii) Respiratory metabolism.

 

Hence, the correct answer is option: 'B'.

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