Assertion: Glucose, `Na^(+)` and amino acids are absorbed actively.
Reason: `Na^(+)`, glucose and amino acids move against the concentration gradient and hence require energy .

Options

A. If both assertion and reason are true and reason is the correct explantion of assertion
B. If both assertion and reason are true but reason is not the correct explnantion of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that glucose, sodium ions (Na+), and amino acids are absorbed actively. Active absorption is a process that requires energy to move substances against their concentration gradient.

2. **Understanding the Reason**: The reason provided explains that Na+, glucose, and amino acids move against their concentration gradient, which necessitates the use of energy. This is a fundamental principle of active transport.

3. **Active Transport Mechanism**: Active transport is characterized by the movement of molecules from an area of lower concentration to an area of higher concentration. This process is essential for the absorption of nutrients in the intestines.

4. **Energy Requirement**: Since the movement is against the concentration gradient, energy is required. This energy is typically derived from ATP (adenosine triphosphate) in biological systems.

5. **Conclusion**: Both the assertion and the reason are correct. The assertion that glucose, Na+, and amino acids are absorbed actively is true, and the reason that they move against the concentration gradient requiring energy is also true. Therefore, the reason correctly explains the assertion.

### Final Answer:
Both the assertion and reason are true, and the reason is the correct explanation of the assertion.

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