Which one of the following is considered at the primary level in the food web? ans. Homo sapience Nostoc Green plants Anabina

Understanding the Food Web

In a food web, organisms are classified based on their roles, specifically as producers, consumers, or decomposers. The primary level consists of producers, which are organisms that can create their own food through processes like photosynthesis.

Analyzing the Options

1. Homo sapiens: These are humans and are classified as secondary or tertiary consumers since they rely on other organisms for food.

2. Nostoc: This is a genus of cyanobacteria, but they do not typically represent the primary level in terrestrial food webs.

3. Green plants: These are quintessential primary producers, performing photosynthesis to convert sunlight into energy.

4. Anabaena: Similar to Nostoc, this is another genus of cyanobacteria, but it primarily acts within aquatic ecosystems. It plays a role in nitrogen fixation but is not categorized within the primary producers of most food webs.

Final Answer

Green plants are considered at the primary level in the food web as they serve as the primary producers, forming the basis of the food chain by converting solar energy into chemical energy through photosynthesis.