Which of the following organisms can have all of the energy it uses to move, grow, and survive traced back to radiant energy from the sun?

a tree

a human

a flower

a bacterium

a fish

The correct answer is option A and C i.e Tree and flower

Explanation:

The trees and flowers are considered as the primary producer of food in any food chain. They entrap the solar energy from sun through green leaves and convert it into food in the form of its various produce. As the consumer eat the plant only 10% of energy of plant is transferred to the it, like wise in all the trophic levels of food chain the energy transferred from one level to other is just 10 % of its preceding level. This means that most of the energy lies with the producer and thus they can use 100% of their energy for moving, growing and surviving

when it is at an intermediate population density