Motorcycle is related to Battery as a source of power. In the same way, Life is related to which of the following?

Introduction / Context:
This analogy is about sources of energy. A Motorcycle needs a Battery as a key source for starting and electrical power. You must extend this idea of essential power source from the mechanical context of a motorcycle to the broader context of Life on Earth.

Given Data / Assumptions:
1) A Motorcycle uses a Battery to provide electrical energy for ignition and operation of various systems.

Concept / Approach:
The first pair expresses the relationship between a machine and its immediate source of stored energy. For Life on Earth, the ultimate and primary source of energy is the Sun. Plants use sunlight to produce food through photosynthesis, and that energy flows through food chains to almost all living organisms. Among the options Star, Moon, Sun, and Earth, the Sun is both a star and the recognised primary energy source for Life.

Step-by-Step Solution:
Step 1: Recognise that the Battery provides the initial and ongoing electrical energy needed for a Motorcycle to function. Step 2: Understand that the analogy is about a crucial source of energy for a system. Step 3: Consider Life on Earth as the second system. The primary natural energy source for most forms of life is the Sun. Step 4: Evaluate the options. Star is a general category and could include many stars that have no effect on Earth. Moon reflects sunlight and influences tides but is not the fundamental energy provider for life. Step 5: Earth is the environment where life exists, not the energy source itself. Step 6: Therefore Sun is the correct parallel source for Life, just as Battery is for Motorcycle.

Verification / Alternative check:
Think of energy flow. The Battery stores chemical energy that becomes electrical energy for the Motorcycle. For Life, ecosystems depend on solar energy that drives climate and allows plants to produce food. While the Sun is a Star, simply choosing Star would lose the specific link to Earth. The Moon and Earth do not supply the majority of energy for biological processes, so they are weaker choices.

Why Other Options Are Wrong:
Star is too general and does not point specifically to the energy source of life on this planet. Moon provides light at night and affects tides but is not the primary source of energy for life. Earth is the place where life exists and where resources are found, but energy still arrives mainly from the Sun.

Common Pitfalls:
Some students may be tempted to pick Earth because they associate life strongly with the planet. However, the type of relationship in the first pair is not location but power source. Recognising that the Battery is an energy source pushes you to look for the main energy source for Life, which is the Sun.

Final Answer:
Thus, the correct completion of the analogy is Life : Sun, just as Motorcycle : Battery. The correct answer is Sun.