4.4.1 Photosynthesis

Question 1

What is the equation for photosynthesis?

Answer 1

carbon dioxide + water light → glucose + oxygen

Question 2

What are the chemical symbols for the substances involved in photosynthesis?

Answer 2

CO2, H2O, O2, C6H12O6

Question 3

How is photosynthesis described in terms of energy?

Answer 3

Photosynthesis is an endothermic reaction where energy is transferred from the environment to the chloroplasts by light.

Question 4

What factors affect the rate of photosynthesis?

Answer 4

Temperature, light intensity, carbon dioxide concentration, and the amount of chlorophyll.

Question 5

What skills should students develop regarding the rate of photosynthesis?

Answer 5

Measure and calculate rates, extract and interpret graphs, plot and draw graphs, and translate information between graphical and numeric form.

Question 6

What is the significance of limiting factors in photosynthesis?

Answer 6

Limiting factors interact and any one of them may limit photosynthesis. They are important for maximizing rates in greenhouse economics.

Question 7

What is the required practical activity related to photosynthesis?

Answer 7

Investigate the effect of light intensity on the rate of photosynthesis using an aquatic organism such as pondweed.

Question 8

What are the uses of glucose produced in photosynthesis?

Answer 8

Used for respiration, converted into insoluble starch for storage, used to produce fat or oil, used to produce cellulose, and used to produce amino acids.

Question 9

What additional substance do plants use to produce proteins?

Answer 9

Nitrate ions absorbed from the soil.