contestada

Suppose that the concentration of CO2 available for the Calvin cycle decreased by 50% (because the stomata closed to conserve water).
Which statement correctly describes how O2 production would be affected? (Assume that the light intensity does not change.)
A. The rate of O2 production would remain the same because the light reactions are independent of the Calvin cycle.
B. The rate of O2 production would decrease because the rate of ADP and NADP+ production by the Calvin cycle would decrease.
C. The rate of O2 production would decrease because the rate of G3P production by the Calvin cycle would decrease.
D. The rate of O2 production would remain the same because the light intensity did not change.

Respuesta :

Answer:

The correct answer is B. The rate of O2 production would decrease because the rate of ADP and NADP+ production by the calvin cycle would decrease.

Explanation:

The light reactions and calvin cycle are dependant on each other. If concentration of CO2 is decreased, less ADP and NADP+ will be produced by the calvin cycle resulting in decrease O2 production.

The ADP and NADP+ molecules produced in calvin cyce are required by the light reactions where they get converted into ATP and NADPH respectively, ultimately producing oxygen.

Hence option B is correct.

Oseni

If the concentration of CO2 available for the Calvin cycle decreases, the rate of O2 production would remain the same because the light reactions are independent of the Calvin cycle.

The entire photosynthetic process happens in 2 main reactions:

  1. Light-dependent reaction
  2. Light-independent reaction or the Calvin cycle

During the light-dependent reaction, the electron in the photosystem of the chlorophyll molecule is excited by light and gets displaced. At the same time, a molecule of water splits, and the electron released replaces the one lost by the photosystem. This leads to the release of oxygen.

The light-independent reaction/Calvin cycle is characterized by the fixation of CO2 into glucose.

Thus, the production of oxygen is not in any way affected by the fixation of CO2.

More on the reactions of photosynthesis can be found here: https://brainly.com/question/1388366

Otras preguntas