Final answer:
True. Primary producers convert light energy to chemical energy through photosynthesis, making energy available for other organisms. While some energy is used for their own needs, the remaining energy, known as net primary productivity, is accessible to consumers in the ecosystem.
Step-by-step explanation:
The statement, 'Store energy in forms that make it available to other organisms that eat them, which is why they are also called primary producers' is True. Primary producers, such as plants, algae, and photosynthetic bacteria, convert light energy to chemical energy through photosynthesis. This energy is then stored in organic molecules like glucose, which can be accessed by other organisms within the ecosystem.
Some energy captured by the producers is used for their own growth and reproduction, which is measured as gross primary productivity. Net primary productivity is the energy that remains after accounting for the producers' respiration and heat loss, and is what is available to the primary consumers in the food chain.