In an ecosystem. animals which feed directly on plants arc called

Explanation

In an ecosystem, there are different types of organisms that interact with each other. One important group of organisms are the animals that feed directly on plants, and they are called primary consumers. This means that they are the first level of consumers in the food chain, as they eat the producers (plants) directly. Examples of primary consumers include herbivores like rabbits, cows, and deer. It is important to note that there are other types of consumers in the ecosystem, such as secondary consumers which feed on primary consumers, and predators which hunt and feed on other animals. Producers are organisms that make their own food through photosynthesis, such as plants and some bacteria. Therefore, the correct answer to the question is option B: primary consumers. They are an important part of the food chain and play a crucial role in maintaining the balance of the ecosystem.