CHAPTER 6.5 PHOTOSYNTHESIS S11

What is the major problem faced by C₃ plant during hot and dry day?

• Photorespiration

• Water

• Temperature

• Sunlight

Why photorespiration occurs when the concentration of O₂ is higher than the concentration CO₂?

• Rubisco has higher affinity to O₂

• Rubisco has higher affinity to CO₂

• CO₂ act as competitive inhibitor

• CO₂ can bind to Rubisco

What is the product of photorespiration?

• 2 molecule of 3-Phosphoglycerate

• Phosphoglycolate and 3-Phosphoglycerate

• Glyceraldehyde-3-phosphate and Phosphoglycolate

• 2 molecule of Glyceraldehyde-3-phosphate

Describe the Kranz anatomy

• Mesophyll cell arranged in ring form around bundle sheath cell

• bundle sheath cell arranged in ring form around Mesophyll cell

• Chlorophyll arranged in ring form around bundle sheath cell

• Mesophyll cell arranged in ring form around epidermis

What is the first product of C4 pathway?

• Oxaloacetate

• Malate

• 3-Phosphoglycerate

• Phosphoenolpyruvate

Why PEP Carboxylase is useful in C4 Pathway?

• PEP carboxylase has no affinity to O₂

• PEP carboxylase has no affinity to CO₂

• PEP carboxylase function at high temperature

• PEP carboxylase only bind to O₂

What is the similarity between CAM pathway and C₃ pathway?

• Both occur in mesophyll cells

• Both occur in bundle sheath cells

• Both occur in during day time

• Both occur in during night time

What is the similarity between C₄ plant and CAM Pathway?

• Both first product is Oxaloacetate

• Carbon fixation occurred once in both

• Both occurs in the same plant

• Both first product is Malate

Why photorespiration is wasteful?

• Phosphoglycolate breakdown into CO₂ without producing organic molecule.

• Phosphoglycolate is a high energy molecule

• Photorespiration increase the production of Glyceraldehyde-3-phosphate by 40%

Which of the following is an example of CAM plant?

• Sugar cane

• Paddy

• Cactus

• Corn