Question

Rate of conversion of light energy into chemical energy of organic molecules in an ecosystem is called

• A. Net primary productivity
• B. Gross primary productivity
• C. Net secondary productivity
• D. Gross secondary productivity

Answer 1

The correct option is B Gross primary productivity

In a food chain, energy stored at the producer level is called as primary productivity. Producer level includes plants and other photosynthetic organisms. Energy stored at the consumer level is called as secondary productivity. Consumer level includes herbivores, carnivores and decomposers. Gross primary productivity is the rate of photosynthesis. In other words, it is the rate of conversion of light energy into chemical energy of organic molecules in an ecosystem. Net primary productivity is the rate of storage of organic matter except which is utilized for the respiration by plants. Net productivity is the rate of storage of organic matter which is not used by the consumers. Net primary productivity is the rate of storage of organic matter apart from that is utilized by consumers. Gross primary productivity is the rate of storage of organic matter by consumers.

Thus, the correct answer is 'Gross primary productivity.'