Question

Assertion (A): Asparagine and glutamine are most important amides found in plants as a structural part of a protein. Reason (R): Amides contain more nitrogen than amino acids as hydroxyl part of the acid is replaced by another $NH_{2}^{-}$ radicle.

• A. Both (A) and (R) are correct and (R) is the correct explanation to (A)
• B. Both (A) and (R) are correct but (R) is not correct explanation for (A)
• C. (A) is correct (R) is wrong
• D. (A) is wrong (R) is correct

Hint:

Amides = Amino Acid + $NH_2$ (High N content).

Answer 1

The Correct Option is A

Step 1: Read both statements.
The assertion says asparagine and glutamine are important amides in plants. The reason says amides hold more nitrogen than amino acids because a hydroxyl group is replaced by another amino group. We must check both and see if the reason explains the assertion.

Step 2: Check the assertion.
Plants make asparagine and glutamine from aspartic acid and glutamic acid. These amides are real and very important for storing and moving nitrogen in the plant. So the assertion is true.

Step 3: Look at how an amide forms.
An amino acid has a side acid group with a hydroxyl ($OH$) part. When this $OH$ is swapped for an amino ($NH_2$) group, the molecule becomes an amide.

Step 4: Count the nitrogen.
Because an extra $NH_2$ is added, the amide now carries one more nitrogen atom than the parent amino acid. So amides truly contain more nitrogen. The reason is true.

Step 5: Link reason to assertion.
Plants prefer these amides exactly because they pack more nitrogen per molecule, making them efficient for transport and storage. So the extra nitrogen explained in the reason is the very cause of their importance.

Step 6: Final decision.
Both statements are correct and the reason correctly explains the assertion.
\[ \boxed{\text{Both (A) and (R) are correct and (R) is the correct explanation to (A)}} \]