KGS N4N5
Unit 1 – Photosynthesis
Revision
1. What do green plants make by the process of photosynthesis?
2. Circle which of the following is NOT needed by a plant for
photosynthesis.
Oxygen
Chlorophyll
3. a)
b)
Starch
Glucose
Carbon Dioxide
Light
Water
What chemical is needed by plants to trap light energy?
Where is it found in plants?
4. What is the energy change during photosynthesis?
5. What is the main product of photosynthesis?
6. What by- product of photosynthesis is released into the air?
7. Write the summary equation for photosynthesis.
8. What important biological process allows carbon dioxide to pass
into a leaf and oxygen to pass out of the leaf?
9. Starch and cellulose are 2 carbohydrates found in plants. What
are they made from and what are their uses?
10.
11.
a)
Describe what happens during photolysis
b)
What products of photolysis are used in Carbon
Fixation?
What gas is released during photolysis?
Limiting Factor
12.
Method to overcome
Describe what happens during Carbon Fixation
13. A commercial Horticulturists is producing tomatoes in
greenhouses. Describe 3 steps the horticulturist could take to
overcome limiting factors reducing tomato growth.
14. An investigation was carried out to compare the total uptake of
carbon dioxide by a green leaf and a variegated leaf of the same
species. The volume of carbon dioxide was measured (in cubic
millimetres) after 4hours and again after 8 hours.
The results are given in the following table.
Time
(hours)
Volume of carbon dioxide absorbed
(mm3)
by green leaf
by variegated leaf
0
0
0
4
280
186
8
516
337
(i) Calculate the average uptake of carbon dioxide per hour by the
green leaf during the 8-hour period.
(ii) What process during photosynthesis uses carbon dioxide?
(iii) Why might the results for the experiment be considered
unreliable?
(iii) What variables would have to be controlled during the experiment?