Page 138 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Macroelement Functions Signs of Effects of excess
deficiency
Iron (i) Important for Yellowing of Brown spots on
the formation leaves between leaves
of chlorophyll the veins
FOR ONLINE READING ONLY
(ii) Important in
transportation
of oxygen

Manganese (i) Catalyst for (i) Yellowing (i) Iron

enzyme action of leaves deficiency
between (ii) Brown
(ii) Required for veins
the formation spots on
of chlorophyll (ii) White or leaves
grey spots surrounded
on leaves by a pale

circle
Molybdenum Helps in the (i) Yellow spots (i) Pale-green
formation of root on leaves leaves
nodules in legumes (ii) Dead spots (ii) Rolled leaf

on leaves margins
(iii) Distorted or (iii) Stunted

dead growth
growing tips

Zinc (i) Important for (i) Yellowing (i) Iron
regulation of of leaves deficiency
plant growth between (ii) Pale green
and maturity veins leaves
(ii) Helps in the (ii) Appearance
formation of of purple or
proteins dark spots
on leaves

(iii) Small,
deformed
leaves

(iv) Reduced
fruiting

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