Which of the following gases retards the rate of photosynthesis?

a. CO

b. NO2

c. CO2

d. CFC


Answer: (b)

When fossil fuel is burnt nitrogen and dioxygen combine to yield significant quantities of nitric oxide (NO) and nitrogen dioxide (NO2) as given below:

N2 (g) + O2 (g) → 2NO (g)

2NO (g) + O2 (g) → 2NO2 (g)

Higher concentrations of NO2 damage the leaves of plants and retard the rate of photosynthesis.

Hence, option (b) is the correct answer.

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