Page 139 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
P. 139
Biology for Secondary Schools
Activity 6.8: Investigating the effects 6. Make daily observations of the
of mineral elements on plant growth plants in the pots or tins, including
height and leaves colouration.
Materials: Pots or tins, seeds (such as
maize and beans), fertilisers containing Record the observations.
FOR ONLINE READING ONLY
different minerals, notebooks, and a
pen Questions
1. Is there any difference in growth
Procedure of the plants in the three pots or
1. Prepare pots or tins for planting tins? Give reasons.
seeds. 2. Why was the fertiliser not
2. Plant the same types of seeds in applied in the first pot or tin?
all pots or tins.
3. Your teacher will explain what Exercise 6.2
is in each type of fertiliser (for
example, ‘NPK’ has Nitrogen, 1. As a Biology student, you are
Phosphorus and Potassium) investigating the role of elements
and the proper amounts of each in plant growth. Explain the
type of fertiliser required by the fundamental difference between
plants. essential and non-essential
4. Vary the amounts of fertiliser elements in the environment of
that you apply in the pots or tins plant nutrition.
as follows: 2. You are working on a research
(a) Do not put any fertiliser in project focusing on the importance
the first pot or tin. of individual elements in plant
(b) Put adequate amounts of growth. Explain why phosphorus
fertiliser in the second pot is considered crucial for plant
or tin. growth and development.
(c) Put excess amounts of 3. You are leading a discussion
fertiliser in the third pot or on the differences between
tin. microelements and macroelements
5. Water all experimental pots or in your classroom. Explain the
tins every morning and evening differences between these two
with the same amount of water categories of nutrients.
for a period of 30 days.
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