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Cause and Effect
Halaman
51
1. Yellowing
of the lower leaf in corn occurs because there
is deficiency of nitrogen.
2. Potassium
deficiency in alfalfa causes about the
appearance of white dots near leaf margins.
3. Purplish
discoloration of leaves in corn caused by
phosphorus deficiency.
4. Boron
deficiency in sugar beet results in heart rot.
5. Leaves lose their green color when the plant
is short of the element magnesium. Since,
magnesium deficiency in coffee produces
yellowing of intervene area of leaves.
6. The appearance
of gray/brown spots on lower leaves in beans due
to zinc deficiency.
Halaman 53
a. Children
do not eat enough. As a result, they suffer from
malnutrition.
b. When the teeth are not cleaned, then they rot.
c. The diet
does not contain iodine. Therefore, this cause goitre.
d. If people smoke cigarettes, this will
increase the danger of suffering from
lung disease.
e. People
are bitten by anopheles mosquitoes. Because of this,
they be in danger of catching malaria.
f. There are
no toilets because of disease spread.
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