Page 135 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

Macroelement Functions Signs of deficiency Effects of excess

(viii) Ripening of (iv) Bluish-green
seeds and or purplish
fruits leaves, as
shown in
FOR ONLINE READING ONLY
Figure 6.14
(c)

Potassium (i) For steady (i) Scorched Deficiency of
growth brown leaf calcium and

(ii) Increases edges and tips, magnesium
resistance to as shown in
diseases Figure 6.14 (d)
(ii) Rolling of
(iii) Useful in leaves
protein
formation (iii) Susceptibility
to diseases

Magnesium (i) Formation of (i) Yellowish (i) Stunted growth
chlorophyll leaves, as (ii) Lack of food
shown in Figure
(ii) Activation of needed for
plant enzymes 6.14 (e) growth and
necessary for (ii) Leaves fall development
growth without due to
withering impaired
photosynthesis

Calcium (i) Formation of (i) Poorly Reduced uptake of
cell walls developed essential elements,
roots with particularly,
(ii) Increases
mechanical weak tips phosphorus and
strength of the (ii) Curling of magnesium
plant leaf margins,
as shown in
(iii) Growth of
roots Figure 6.14 (f)

(iv) Normal (iii) Hooked leaf
transport and tips
retention of (iv) Internal decay
other elements
in the plant

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