Which category of organisms forms the starting point of a food chain ?

Consumers are the organisms that cannot manufacture their own food and are dependent on other organisms for food. The illustration represents a food chain Which of the following pairs of organisms represents the consumers in the given food chain?

Which of the following pollutants affects more to organisms of the higher trophic level of a food chain due to biological amplification?

Which type of organism always occurs at the first step in every food chain?

Match the organism with its properties in a food chain :

Name one organism for each of the 3 categories of organisms regarding their mode of obtaining food .