Question

Minimum concentration of an essential element below which plant growth is retarded, is termed as _________________.

• A. Optimum concentration
• B. Maximum concentration
• C. Critical concentration
• D. Toxicity

Answer 1

The correct option is C Critical concentration

Answer is option C i.e. "Critical concentration"
The concentration of the essential element below which plant growth is retarded is termed as critical concentration. Below this minimum level, plants start to show nutrient deficiency.
While, optimum concentration is the most desirable or satisfactory level of a nutrient. Maximum concentration is the highest concentration of nutrient and nutrient toxicity occurs when excess consumption of a nutrient does harm to an organism.