Primary productivity does not depends on:

Secondary consumers

The correct answer is Option (2) → Secondary consumers

Primary productivity refers to the rate at which energy is captured and stored by producers (plants, algae) through photosynthesis. It primarily depends on plant species, environmental factors (like sunlight, temperature), and nutrient availability.

Primary production refers to the amount of biomass or organic matter produced per unit area over a given time period by plants during photosynthesis. It is commonly measured in terms of weight (grams per square meter, g m^–2) or energy (kilocalories per square meter, kcal m^–2). Productivity, on the other hand, represents the rate of biomass production and is expressed as grams per square meter per year (g m^–2 yr^–1) or kilocalories per square meter per year (kcal m^–2 yr^–1) to facilitate comparison between different ecosystems.

Secondary productivity is defined as the rate at which new organic matter is formed by consumers in an ecosystem. It represents the energy flow and growth of heterotrophic organisms, including herbivores and decomposers, as they consume and process organic matter.