Page 136 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
P. 136
Biology for Secondary Schools
Macroelement Functions Signs of deficiency Effects of excess
Sulphur (i) Production of (i) Slow growth Premature ageing of
protein (ii) Small leaves plants
(ii) Formation of that roll up and
FOR ONLINE READING ONLY
chlorophyll are stiff and
brittle
(iii) Improved
root growth (iii) Premature
and seed shedding of
production leaves
(iv) Tips of buds
die
(a) Normal leaf (b) Nitrogen deficient leaf (c) Phosphorus deficient
leaf
(d) Potassium (e) Magnesium deficient (f) Calcium deficient leaf
deficient leaf leaf
Figure 6.14: Signs of deficiency of some macroelements in a maize leaf
Microelements are essential mineral elements that are needed for plant growth
and survival but only in very small quantities. However, deficiency or excess of
microelements in plants can have effects on physiological activities of plants.
130 Student’s Book Form One Student’s Book Form One
15/10/2024 09:24:40
Biology FORM 1 new.indd 130 15/10/2024 09:24:40
Biology FORM 1 new.indd 130
