1 point
i) In food web A, which of the
foilowing organisms occupy
both 4th and 5th trophic levels
in different food chains? *
O Butcher bird and native cat
Robin and and parasitic wasp
Lizard and butcher Bird
O
Parasitic wasp and native cat
Answers
Answer:
Producers, or autotrophs, make their own organic molecules. Consumers, or heterotrophs, get organic molecules by eating other organisms.
A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another.
In a food chain, each organism occupies a different trophic level, defined by how many energy transfers separate it from the basic input of the chain.
Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems.
Energy transfer between trophic levels is inefficient (with a typical efficiency around 10\%10%10, percent). This inefficiency limits the length of food chains.
Introduction
Organisms of different species can interact in many ways. They can compete, or they can be symbionts (long-term partners with a close association). Or, of course, they can do what we so often see in nature programs: one of them can eat the other. (Chomp!) That is, they can form one of the links in a food chain.
In ecology, a food chain is a series of organisms that eat one another (so that energy and nutrients flow from one to the next). For example, if you had a hamburger for lunch, you might be part of a food chain that looks like: grass \rightarrow→right arrow cow \rightarrow→right arrow human. But what if you had lettuce on your hamburger? In that case, you're also part of a food chain that looks like: lettuce \rightarrow→right arrow human.
As this example illustrates, we can't always fully describe what an organism (such as a human) eats with one linear pathway. For situations like that, we may want to use a food web, which consists of many intersecting food chains and represents the different things an organism can eat, and be eaten by.
In this article, we'll take a closer look at food chains and food webs, seeing how they represent the flow of energy and nutrients through ecosystems.
Explanation: