Question

Match Column I with Column II. Select the correct answer using the given code.

Column I Column II

a) Hill Reaction i) Photolysis

b) Hatch Stack Pathway ii) Photosystem I and II

c) Emerson Enhancement Effect iii)C3 Cycle

d) Calvin Cycle iv) C4 Cycle

• A. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
• B. (a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
• C. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
• D. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Answer 1

Answer:

A. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)

Hill reaction:

• In the presence of suitable electron acceptors like potassium ferrioxalate and potassium ferricyanide, oxygen is produced due to the photochemical splitting of water. This is known as the Hill reaction.

• This takes place in the presence of light.

• The spilling of water during photosynthesis is called photolysis.

  Hatch and Slack Pathway:

• Plants in tropical desert regions follow the C4 pathway.

• The first product of carbon fixation is oxaloacetic acid.

• C4 pathway initiates with a molecule called phosphoenolpyruvate (PEP).

• Phosphoenolpyruvate is the primary CO2 acceptor and is seen in mesophyll cells.

• Carboxylation takes place with the help of an enzyme called PEP carboxylation.

• They yield a 4-C molecule called oxaloacetic acid. Now oxaloacetate is converted into malic acid (transferred to mesophyll cells to bundle sheath cells).

• Oxaloacetic acid is broken down into carbon dioxide and a 3-C molecule.

• Carbon dioxide is utilized in the Calvin cycle.

• 3-C molecule transferred back to mesophyll cell for PEP regeneration.

  Emerson enhancement effect:

• The Emerson enhancement effect refers to the increase in quantum yield of photosynthesis when monochromatic beams of two different wavelengths (680 and 700 nm) are used together on the test organism (Chlorella).

  Calvin cycle or C3 cycle:

• It is defined as a set of chemical reactions performed by the plants to reduce carbon dioxide and other compounds into glucose.