Question

Explain how a carbon atom in a CO2 molecule in the air can become part of a cellulose molecule in a plant

Answer 1

Your carbon atom enters the leaf as CO2 (carbon dioxide) from the atmosphere. In the leaf, chlorophyll uses the energy from the sun to convert CO2 and H2O to the sugar glucose, C6H12O6. Your carbon atom is part of this molecule; it is now one of the carbons in the glucose. 
Next, the glucose carrying your carbon atom is sent down the phloem tissue of the carrot plant to the root, which is the carrot itself. Enzymes in the carrot root connect the glucose molecule with your carbon atom into a chain with other glucose molecules, forming cellulose, or plant starch, and there you go. Your carbon atom went from being part of an atmospheric gas to a starch via photosynthesis and starch formation in the root. 
I hope that helps!

Answer 2

The carbon atom in a CO₂ molecule in the air can become part of a

cellulose molecule in a plant by the carbondioxide molecule reacting with

water during photosynthesis to form Glucose.

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

The glucose molecule formed are then translocated to other parts of the

plants such as the roots and stems and helps in the formation of cellulose.

This is basically how the carbon atom in carbondioxide becomes a cellulose

molecule.

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