B2.4 Photosynthesis and sampling fact sheet
Plant tissues and organs
1. List three plant organs (1)
Roots, stem and leaf
2. Name the tissues in the cross section
of the leaf (4)
A = Epidermis
B and C = Phloem and Xylem
D = Mesophyll
3. Give the function of the mesophyll
tissue (1)
4. Give the function of the epidermis
tissue (1)
5. Give the function of the xylem tissue
(1)
6. Give the function of the phloem tissue
(1)
7. Give the function of the stomata (1)
Carries out photosynthesis
Covers the plant
Transports water
Transports sugars
Allows gases in and out of the leaf
Photosynthesis
8. Write the word equation for
photosynthesis. (2)
9. Where in plant cells does
photosynthesis take place? (1)
10.Describe the function of chlorophyll
(1)
11.What does the plant do with the
glucose it produces during
photosynthesis? (5)
Carbon dioxide + water
Oxygen

Glucose +
In the chloroplasts
Absorbs the light energy for photosynthesis
 Stores it as insoluble starch
 Produces fats or oil for storage
 Produces cellulose which strengthens the
cell wall
 Produces proteins
 Carries out respiration to release energy
12.What process do plants AND animals
do with glucose? (1)
Aerobic respiration to release energy
Limiting factors
13.What is limiting the rate of
B
A = Low carbon dioxide concentration
B = Low temperature or light intensity
A
photosynthesis at points A and B? (2)
14. What is limiting the rate of
B
A = Low light intensity
B = Low carbon dioxide concentration
or temperature
A
photosynthesis at points A and B? (2)
15.What is limiting the rate of
A
B
A = Low temperature
B = The enzymes have denatured
photosynthesis at points A and B? (2)
16.How can farmers increase the rate of
photosynthesis?
a. Increase light intensity (using lights
in the greenhouse)
b. Increase carbon dioxide
concentration (burn paraffin in
greenhouse)
c. Increase temperature (up to a
point) – using greenhouse heaters