Question

All food chains begin with a photosynthetic producer
A. True
B. False

Answer 1

Hint: The food chain has a repeated eating in which each group eats the smaller one and is eaten by the larger one. So a food chain involves a nutritive interaction between the biotic components. The plants and animals form the limbs of a food chain..

Complete answer: Food chain is a series of groups of organisms called trophic levels in which there is repeated eating and eaten by so as to transmit the food energy.
In a food chain, there is always unidirectional flow of energy from sun to producers and then to a series of consumers of various types. Usually 90% of potential energy is lost as heat at each transfer.
Usually there are four or five trophic levels in the food chain and shorter food chains will provide greater available energy and vice versa.
Omnivores generally occupy more than one trophic level in a food chain. Some organisms like humans occupy different trophic positions in different food chains.
Every organism occupies a place in a community according to their feeding relationship with other organisms. The organisms deriving their energy from the same source or obtaining their nourishment from the sun by the same number of steps are said to belong to the same trophic level. Thus the producers which derive their energy from the sun belong to the first trophic level. They include green plants that prepare their food through photosynthesis but many other organisms also synthesize their food by converting chemical energy into starch. Thus all the food chains start with a producer but not necessarily photosynthetic producers.
So, the correct answer is “Option B”.

Note: In an ecosystem, no food chain is independent. A food chain is always straight. It is formed by interlinking of three types of food chains- predatory chains. Parasitic chains and saprophytic chains.