AP BIOLOGY

Detailed explanation-1: -Gross primary productivity is the rate at which organic matter is synthesised by producers per unit area and time.

Detailed explanation-2: -primary productivity, in ecology, the rate at which energy is converted to organic substances by photosynthetic producers (photoautotrophs), which obtain energy and nutrients by harnessing sunlight, and chemosynthetic producers (chemoautotrophs), which obtain chemical energy through oxidation.

Detailed explanation-3: -There are two aspects of primary productivity: Gross primary productivity – The total amount of energy produced in an ecosystem. Net primary productivity – The amount of energy used by the producer for respiration.

Detailed explanation-4: -Gross primary productivity of an ecosystem is the rate of production of organic matter per unit area during photosynthesis.

Detailed explanation-5: -Complete answer: Primary productivity is the rate of formation of new organic matter by producers ie. Plants and other photosynthetic organisms. Secondary productivity is the rate of formation of new organic matter by consumers.