B5.1 Photosynthesis

Question 1

Photosynthesis

Answer 1

The process by which plants manufacture carbohydrates from raw materials using energy from light

Question 2

What is the word equation of photosynthesis?

Answer 2

Carbon dioxide + water –> glucose + oxygen

Question 3

What is the symbol equation of photosynthesis?

Answer 3

6CO2 + 6H20 –> C6H12O6 +6O2

Question 4

What is a waste product in photosynthesis?

Answer 4

Oxygen

Question 5

What is glucose formed by photosynthesis converted into?

Answer 5

Starch and sucrose

Question 6

Factors affecting the rate of photosynthesis

Answer 6

1. CO2 concentration
2. Temperature
3. Light intensity

Question 7

Describe the effect of light intensity on the rate of photosynthesis

Answer 7

As light intensity increases, the rate of photosynthesis increases.
However, high light intensity can sometimes lead to the plant heating above the optimum temperature. This means that temperature would become the limiting factor and the rate of photosynthesis would not be increased by a further increase in light intensity.

Question 8

Describe the effect of temperature on the rate of photosynthesis

Answer 8

At low temperatures (e.g. in winter), plants photosynthesize slowly as the enzymes have little kinetic energy, thus few enzyme-substrate complexes are made.
At very high temperatures, these enzymes denature, also slowing the rate of photosynthesis.

Question 9

Describe the effect of carbon dioxide concentration on the rate of photosynthesis

Answer 9

As CO2 concentration increases, the rate of photosynthesis also increases