Question 23
An increase in carbon dioxide content in the atmosphere would not cause

(a) more heat to be retained by the environment
(b) increase in photosynthesis in plants
(c) global warming
(d) abundance of desert plants

(d) abundance of desert plants

An increase in carbon dioxide in the atmosphere would not cause the abundance of desert plants as when the temperature rises (due to excessive $C{O}_2$ emission) their ability to take up carbon dioxide reduces.