Which of the following statements best describes “carbon fertilization”?

Correct Option: Increased plant growth due to increased concentration of carbon dioxide in the atmosphere.

Explanation:

Carbon fertilization (or the carbon dioxide fertilization effect) refers to the enhancement of plant growth resulting from increased levels of atmospheric carbon dioxide (CO₂).

Key aspects of carbon fertilization include:

1. Enhanced Photosynthesis: Carbon dioxide is a primary reactant in photosynthesis. As atmospheric CO₂ concentration rises, the rate of photosynthesis in many plants increases, allowing them to produce more carbohydrates and grow faster.

2. Increased Water-Use Efficiency: Higher concentrations of CO₂ enable plants to partially close their stomata (the tiny pores on leaves used for gas exchange), which reduces water loss through transpiration while maintaining sufficient CO₂ intake for photosynthesis.

Therefore, the statement that best describes "carbon fertilization" is the increased plant growth caused by elevated levels of atmospheric carbon dioxide.