Page 127 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six
P. 127
Biology for Secondary Schools
yellow, red and white. The green
areas have chlorophyll but areas
Retort stand
Leaf A Air with other colours do not have
Leaf B
Conical flask Water chlorophyll. Figure 6.6 shows
FOR ONLINE READING ONLY
Air variegated leaves with green and
Soda lime Potted plant
yellow patches.
Figure 6.5: Experimental set-up to
determine the importance of carbon
dioxide in photosynthesis
4. Place the plant in sufficient light
for 6 hours at room temperature.
5. Remove the two leaves (leaf A Figure 6.6: Variegated leaves with green
and B) from flasks. and yellow patches
6. Test for starch by using standard
procedures as in Activity 6.3. 2. Describe a colour map of the leaf.
7. Record your observations. 3. Test the leaf for the presence of
starch using standard procedures
as in Activity 6.3.
Activity 6.5: An experiment to 4. Compare the stain patterns with
determine whether chlorophyll is the described colour map. What
necessary for photosynthesis do you notice?
Materials: Variegated leaves, iodine 5. Record your observations and
solution, absolute ethanol or spirit, then share with your teacher.
beaker, white tile, water, heat source, Question
pencil, and notebook
Based on the results you have obtained,
what conclusion can you draw about
Procedure variegated leaves in relation to
1. Pick a variegated leaf from a plant photosynthesis?
that has been exposed to sunlight
for at least 6 hours. Variegated Activity 6.6: An experiment to
leaves are green but mixed with determine whether sunlight is necessary
patches of other colours, such as for photosynthesis
Student’s Book Form One Student’s Book Form One 121
15/10/2024 09:24:38
Biology FORM 1 new.indd 121
Biology FORM 1 new.indd 121 15/10/2024 09:24:38
