First slide

Essential Mineral Nutrients

Question

Choose the incorrect match

Easy

A

Thiobacillus – Denitrifying bacterium
B

Anabaena – Free living nitrogen fixer
C

Zinc – Activator of carboxylases
D

Sulphur – Mobile element

Solution

Sulphur is immobile element because it is not easily detached from cell components. Its deficiency symptoms are first seen in younger leaves. Zinc is activator of carboxylases, alcohol dehydrogenase and carbonic dehydrogenase. Anabaena is a cyanobacterium which not only fixes nitrogen to ammonia but also fixes ${CO}_{2}$ by photosynthesis. Thiobacillus is a denitrifier that converts nitrates to molecular nitrogen.

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