Mineral ions in plant processes Steps:

• Identify roles: Nitrate ions (NO3-) are essential for amino acid and protein synthesis; magnesium ions (Mg2+) are required for chlorophyll synthesis.
• Cellulose synthesis uses glucose from photosynthesis, needing neither NO3- nor Mg2+.
• Processes requiring either ion: protein synthesis (NO3-) and chlorophyll synthesis (Mg2+), but not cellulose.
• Match to options: Correct choice marks ✓ for chlorophyll and proteins, ✗ for cellulose.

Why D is correct:

• D accurately identifies chlorophyll synthesis needing Mg2+ (central atom in chlorophyll) and protein synthesis needing NO3- (nitrogen source for amino acids), while cellulose does not.

Why the others are wrong:

• A incorrectly marks cellulose as requiring these ions and proteins as not.
• B misattributes ion needs (specific mismatches not detailed).
• C wrongly denies needs for both chlorophyll and proteins.

Final answer: D