bio 5C

Question 1

what is the factor called before the rate reaches its saturation point?

Answer 1

a limiting factor (restricts the reaction from reaching a certain rate)
- when the limiting factor increases, the whole rate of reaction increases

Question 2

how does light affect the rate of photosynthesis?

Answer 2

• as light increases, the rate of photosynthesis increases until a certain point (saturation point) due to the amount of light energy needed to excite the electrons and execute photosynthesis (light-dependent stage)

Question 3

how does light colour affect the rate of photosynthesis?

Answer 3

wavelengths influence the rate of reaction

Question 4

how does water affect the rate of photosynthesis?

Answer 4

the more limited the water supply, the more the rate of photosynthesis is affected
- when plants close their stomata to conserve water, it limits gaseous exchange (CO2 + O2) with the environment meaning CO2 can no longer enter the cells while O2 cannot exit into the atmosphere (increases the rate of photorespiration)

Question 5

what are the compared effects of water availability between C3, C4, AND CAM plants?

Answer 5

due to their evolved adaptations, C4 and CAM plants are mot affected by water availability unless it is extreme whilst C3 plants are more susceptible to water loss and its impacts of reduced water on photosynthesis rate

Question 6

how does temperature affect the rate of photosynthesis?

Answer 6

enzymes all have their own optimal temperature ranges and outside of them, enzymes work less efficiently and either reduce the rate of photosynthesis or denature entirely, impacting the rate of photosynthesis

Question 7

how does pH affect the rate of photosynthesis?

Answer 7

enzymes all have their own optimal pH ranges and outside of them, enzymes work less efficiently and either reduce the rate of photosynthesis or denature entirely, impacting the rate of photosynthesis

Question 8

what are the compared effects of temperature and pH between C3, C4, AND CAM plants?

Answer 8

Each plant type has evolved to be suited to their respective environments, meaning that while the general shape of the graph remains the same, the optimal temperature and pH values and ranges may differ between them.
- C4 and CAM plants are more suited for hot and dry environments
- C3 plants are more suited for cool environments