Bioenergetics

Question 1

Limiting factors of photosynthesis:

Answer 1

CO2:
As this is increased, the rate of photosynthesis increases. When the rate no longer increases that means CO2 is no longer the limiting factor.

Light intensity:
Same as CO2

Chlorophyll:
If a leaf has less chlorophyll, it traps less light energy than other leaves. Lower rate of photosynthesis.

Temperature:
As we increase temperature, the enzymes involved involved in photosynthesis work faster so the rate increases.
If we increase the temperature too high, the enzymes will denature and the rate falls (45 degrees)

Question 2

What are the uses of glucose from photosynthesis?

Answer 2

To release energy in respiration which takes place in the mitochondria.

Glucose is only produced in photosynthesis during the day when there’s light, but plant cells respire all the time. So the glucose produced from photosynthesis is used to produce the insoluble storage molecule starch.
This converted back into glucose when it is needed.

Glucose is converted into fats and oils. Fats and oils are used by the plant as a storage form of energy.

Cell wall contains cellulose which gives it strength. Cellulose is made from glucose.

Also used to produce amino acids in the plant. Amino acids in the plant are used to synthesise proteins. To make amino acids from glucose, plants need to absorb nitrate ions from the soil.