Page 129 - General and Inorganic Chemistry for Advanced Secondary Schools Students Book Form Five and Six

Biology for Secondary Schools

5. What conclusion can you draw
Gas
from this experiment?

Gas bubble
Importance of photosynthesis
FOR ONLINE READING ONLY
Test tube Task 6.4
Beaker Read from reliable internet sources and
Water
biology books information about the
Pond weed importance of photosynthesis

Photosynthesis is a vital process for the
Figure 6.8: Experimental set-up to show
that photosynthesis produces oxygen continuous survival of plants and other
organisms on earth. The importance
3. Leave the set-up exposed to the of photosynthesis includes production
sunlight for 6 hours. of oxygen, reduction of atmospheric

4. Remove the test tube slowly, carbon dioxide, conversion of solar
covering its mouth while it is still energy into chemical energy, and
under water. production of food.

5. Open the test tube slightly but
quickly and introduce a glowing Production of oxygen
splint. Photosynthesis produces oxygen. This

6. Record what you have observed. replenishes the atmospheric oxygen
that has been used during burning,
Questions respiration, rusting, and other processes.
1. What did you observe when the All aerobic organisms require oxygen
experimental set-up was exposed for respiration.
to sunlight?
2. What did you observe when a Reduction of atmospheric carbon
glowing splint was introduced
into the test tube? dioxide
3. Why did gas bubbles evolve The process of photosynthesis uses
from the bottom part of the carbon dioxide from the atmosphere.
experimental set-up? This process reduces atmospheric
4. Name the gas that evolved from carbon dioxide, since it is converted
the experimental set-up and give into carbohydrate in the presence of

reason to support your answer. water, sunlight, and chlorophyll. Being

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