Plant food manufactured by the process of photosynthesis in the presence of a nutrient in chlorophyll is:

✅ Explanation:
-The "plant food" manufactured during photosynthesis is glucose (a sugar).
-Chlorophyll, the green pigment essential for photosynthesis, has a central magnesium (Mg) ion in its structure. This magnesium ion plays a crucial role in capturing light energy, which is then converted into chemical energy stored in glucose.

📌 Other Options Explanations:
-(a) Ca (Calcium): Calcium is important for plant cell wall structure and cell signaling, or directly involved in the photosynthesis process itself.
-(c) Iron: Iron is a vital micronutrient for plants, involved in chlorophyll synthesis and electron transport during photosynthesis.
-(d) Boron: Boron is essential for cell wall formation, sugar transport, and other plant processes,