Which of the following is/are the implications of rising carbon di oxide(Co2) levels in the atmosphere on food system of the world? It reduces the concentrations of protein and essential minerals in most plant species, including wheat, soybeans, and rice. It can stimulate plant growth. Select the correct answer using the code given below.

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C

Notes:

Statement 2 is correct– Elevated CO2 increases crop yields and growth through an increase in photosynthetic rate. CO2 fertilization effect or carbon fertilization effect causes an increased rate of photosynthesis while limiting leaf transpiration in plants. Both processes result from increased levels of atmospheric carbon dioxide (CO2).
Statement 1 is correct– According to IPCC report increased CO2 can lower nutritional value in some crops.

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