Question

What trait of an ecosystem does primary productivity measure?

weight of all organisms in the ecosystem
rate at which the ecosystem produces chemical energy from sunlight
number of organisms in the ecosystem
rate of loss of energy in the ecosystem

Answer 1

Primary productivity measures the rate at which ecosystems produce chemical energy from sunlight, taking into consideration both gross and net primary productivity, with the latter being the energy available to other organisms after primary producers' respiration and heat loss.

Step-by-step explanation:

Primary productivity measures the rate at which the ecosystem produces chemical energy from sunlight. Specifically, this concept refers to gross primary productivity, which is the rate at which photosynthetic primary producers, such as plants and algae, incorporate energy from the sun. It's important to note that not all of this energy is available for other organisms because primary producers also use some of it for processes like growth, reproduction, respiration, and resulting metabolic heat loss. The energy that remains after these processes is known as net primary productivity, and it represents the energy available to primary consumers in the food web.

Answer 2

Answer: Option B

Explanation:

The primary productivity can be defined as the production of organic compounds from the atmospheric carbon dioxide or aqueous carbon dioxide.

It primarily defines the the products that is formed by the process of photosynthesis that uses the radiant energy.

The life on the earth relies on the primary production either directly or indirectly.

Hence, the correct answer is option B