Which of the following is not a possible effect of rising carbon dioxide levels on plants?
a.
increased photosynthesis
b.
increased plant mortality
c.
increased crop productivity
d.
increased plant growth

increased plant mortality

Explanation:

The rise of carbon dioxide in the atmosphere  will definitely bring about increased in photosynthesis.

Photosynthesis in plants is a process whereby green plant produces nutrient in the present of sunlight from carbon dioxide and water. Photosynthesis is a necessity for plants to supply nutrient to the plants . The chemical equation for photosynthesis  can be represented as follows:

6CO2 + 6H2O sunlight → C6H1206 + 6O2

Photosynthesis converts light energy into chemical energy. Green plants in the presence of sunlight uses CO2 and H2O to produce food. Increase carbon dioxide will definitely increase crop productivity and plant growth. The more the carbon dioxide and water in the presence of sunlight  nutrient are added to the plant.

Plant will definitely not die because of rise in CO2.  

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.