Question

In a food chain, if the grasses produce 1000 kcal of energy, how many kcal are theoretically available to the frogs?
A. 1000
B. 100
C. 10
D. 1
E. 0.5

Answer 1

Hint: Generally, the term food chain can be defined as the flow of organisms through which the energy, strength, and nutrients uphold as one creature eats the other. Generally, this type of chain helps us to understand the relationship in the middle of an organism based on the food they eat. Typically, each level of a food chain represents a different trophic level. One can say that the presence of food chains is important for the sake of the survival of most species. It is the fact that if a species is removed from the chain, it can result in the demise of a species.

Complete answer:
 Only ten percent of the energy will be passed on from one trophic level to the next level.
-For example:
Sun $\rightarrow$ Green $\rightarrow$ plants $\rightarrow$ Insects $\rightarrow$ Frogs $\rightarrow$ Snakes.
-The energy that is used by the green plants is provided by the sun.
-Primary producers for the food chain are green plants. Plants convert energy from the sun into food.
-Insects are the first animals to eat the plants, so they are the primary consumers when insects eat the plants and obtain some of the energy (10%) in which they are stored when making food.
-The energy that is left is lost and dissipated as heat.
-Frogs eat insects. So, frogs are the secondary consumers in this food chain. They receive the part of the energy that is stored by the insects. The rest energy stored by the insects is lost.
Hence, the correct answer is option C.

Additional Information:
The food chain reveals how energy is transferred from one living organism to another organism through food.
The food chain begins from the producers (grass or plants) and ends at predators, decomposers, or detritivores (woodlice or earthworms).
Food chains are usually used in ecological-modeling.
The Food Web is formed by the natural interconnections between food chains.

Note:
The food chain is the sequence of organisms through which energy and nutrients pass as one organism eats another. In a good chain, an organism at one trophic level feeds an organism at the level below it. The food chain describes the feeding relationships within a community. In the food chain at every stage, only 10% of energy will be transferred in the successive stage. The remaining energy is lost and dissipated as heat.