Question

In which type of environment are plants most likely to use a C4 pathway of carbon fixation? cold and wet cold and dry hot and wet hot and dry

Answer 1

Answer;

Hot & Dry conditions

Explanation;

-C4 is the alternative pathway of Calvin cycle (C3 cycle) taking place during the dark phase (light-independent stage) of photosynthesis. In the C4 cycle the first stable compound is 4 carbon compound, namely oxaloacetic acid. Hence it is called C4 cycle. It is a process of carbon dioxide fixation.

-C3 plants have the disadvantage that in hot dry conditions their photosynthetic efficiency suffers because of a process called photorespiration. When the CO2 concentration in the chloroplasts drops below about 50 ppm, the catalyst rubisco that helps to fix carbon begins to fix oxygen instead.

-The problem of photorespiration is overcome in C4 plants by a two-stage strategy that keeps CO2 high and oxygen low in the chloroplast where the Calvin cycle operates.

Answer 2

Hot & Dry conditions.. Because C4 cycle is used in reducing the loss of water during hot seasons.