Question

Select the incorrectly matched pair with regard to the C4​ cycle?

• A. Primary CO2​ fixation product - PGA
• B. Site of initial carboxylation - Mesophyll cells
• C. Primary CO2​ acceptor - PEP
• D. C4​ plant - Maize
• E. Location of enzyme RuBisCO - Bundle sheath cells

Answer 1

The correct option is A

Primary CO2​ fixation product - PGA

The correct option is A.

Explanation of the correct option:

1. The carbon dioxide fixing product is known as oxaloacetic acid which is present in C₄.
2. This product is then transported to the bundle sheath after converting to malic acid and aspartic acid.

Explanation of the incorrect options:

Option B:

1. The initial carboxylic reaction takes place only in mesophyll cells.
2. This is considered the initial reaction of mesophyll cells.
3. PGA is known as the primary Carbon dioxide fixation product.

Option C:

1. PEP is known as the 3C compound which functions as the primary CO₂ consumer in mesophyll cells.
2. The PEP enzymes are responsible for these types of reactions.

Option D:

C₄ carbon fixation is one of the majorly known processes of photosynthesis which are for the carbon fixation in plants.

Option E:

1. The RUBISCO is known as an enzyme that is prevalent in chloroplast and functions in the process of photosynthesis.
2. Chloroplast mixes with RUBP with enediol and carbon dioxide which changes to phosphoglycerate.

Final answer:

Primary CO_2​ fixation product - PGA is the incorrectly matched pair with regard to the C_4​ cycle