Concept explainers
Introduction:
Energy is defined as the capacity to do work. Living organisms constantly use energy to grow, move, acquire nutrients, and reproduction. In all these processes, there is also a significant loss of energy.
Answer to Problem 1SQ
Correct answer:
Sunlight is life’s primary source of energy. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Option c. is given as, “sunlight.”
The energy that fuels most life on Earth comes from the sun. This energy flows through producers such as plants then consumers such as animals. In this journey, the energy is transferred many times. With each transfer, some energy escapes as heat. Eventually, all of it is permanently dispersed. Hence, option c. is correct.
Reason for incorrect answer:
Option a. is given as, “food.”
Food is taken by human beings and animals, but not plants. Plants depend on sunlight for energy. Hence, option a. is incorrect.
Option b. is given as, “water.”
Water does not act as a primary source of energy. It plays an important role in assisting many biological reactions. Hence, option b. is incorrect.
Option d. is given as, “ATP.”
ATP is known as the energy currency of the cell. It is made by the process of glycolysis in which glucose gets break down into pyruvate. It plays an important role in catalyzing many biochemical reactions but is still not considered the primary source of energy. Hence, option d. is incorrect.
Hence, the options a., b., and d. are incorrect.
The life’s primary source of energy is considered to be sunlight. Thus, the correct option is c.
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Chapter 5 Solutions
Biology: Concepts And Applications 9th Biology [jan 01 2014] Starr Cecie; Evers
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