Directions: The question consists of two statements, an assertion (A) and a…
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Directions: The question consists of two statements, an assertion (A) and a reason (R). Read both the statements and decide which of the following answer choice correctly depicts the relationship between these two statements.
A: Plants require oxygen for photosynthesis.
R: Oxygen helps to make food along with water.
- A.
Both A and R are true and R is the correct explanation of A.
- B.
Both A and R are true and R is not the correct explanation of A.
- C.
A is true but R is false. A is false but R is true.
- D.
Both A and R are false.
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Correct answer: D
Conclusion: Both the assertion and the reason are false. The correct relationship is that both statements are false.
Why the assertion is false: The statement saying plants require oxygen for photosynthesis is incorrect. Photosynthesis requires carbon dioxide, water, sunlight, and chlorophyll. Oxygen is released as a byproduct of the process.
Why the reason is false: The reason claims that oxygen helps to make food along with water, which is wrong. It is carbon dioxide (not oxygen) that combines with water, using energy from sunlight, to produce glucose; oxygen is produced and released.
Key fact: Photosynthesis overall equation shows carbon dioxide and water forming glucose and oxygen using light energy.
Representative equation: 6CO2 + 6H2O —light/chlorophyll→ C6H12O6 + 6O2 (carbon dioxide is a reactant; oxygen is a product).
Therefore, the correct choice is the one that states both the assertion and the reason are false.