Difference between C3, C4 and CAM Cycle

Q.

A Plant in your garden avoids photorespiratory loss, has improved water use efficiency, shows high rate of photosynthesis at high temperatures and has improved efficiency of nitrogen utilisation. In which of the following physiological groups would you assign this plant

1. Nitrogen fixer

2. $C_3$

3. $C_4$

4. $CAM$

Q. C₄ plants are more efficient in photosynthesis than C₃ plants due to

1. Higher leaf area
2. Presence of cuticle
3. Presence of larger number of chloroplasts
4. Lower rate of photorespiration

Q. A process that makes important difference between $C_3$ and $C_4$ plants is

1. Photosynthesis
2. Photorespiration
3. Transpiration
4. Glycolysis

Q. How does CAM photosynthesis differ from C3 or C4

1. Malic acid is formed at night, stored in vacuoles in cells housing chloroplasts
2. CAM photosynthesis continues at night while C3 and C4 photosynthesis occur during the day
3. CAM plants must use large quantity of water for photosynthesis
4. CAM photosynthesis extracts carbon from organic compounds

Q. A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis during daytime and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?

1. $C_3$
2. $C_4$
3. $Nitrogenfixer$
4. Both $C_3$ and $C_4$

Q. With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric $C{O}_2$ concentration upto $0.05$% can enhance $C{O}_2$ fixation rate
2. $C_3$ plants respond to higher temperatures with enhanced photosynthesis while $C_4$ plants have much lower temperature optimum
3. Tomato is a greenhouse crop which can be grown in $C{O}_2$ - enriched atmosphere for higher yield
4. Light saturation for $C{O}_2$ fixation occurs at $10\%$ of full sunlight

Q. As compared to a C3-plant, how many additional moleules of ATP are needed for net production of one molecule of hexose sugar by C4-plants:

1. Two
2. Twelve
3. Zero
4. Six

Q. $C_4$ plants are more efficient in photosynthesis than $C_3$ plants due to:

1. Presence of thin cuticle
2. Lower rate of photorespiration
3. Presence of large number of chloroplasts in the leaf cells
4. Higher leaf area

Q. $C_4$ photosynthetic pathway is more efficient than $C_3$ pathway because

1. $C_4$ pathway uses only Calvin cycle
2. $C_4$ pathway minimizes photorespiration
3. $C_4$ pathway produces phosphoglycolate
4. $C_4$ pathway uses only $\mathrm{PEP}$ carboxylase

Q. In comparison to the $C_3$ plant, which of the following is true for ${\mathrm{CO}}_2$ compensation point of $C_4$?

1. $C_4$ plants will have a lower ${\mathrm{CO}}_2$ compensation point
2. $C_4$ plants will have a higher ${\mathrm{CO}}_2$ compensation point
3. $C_4$ plants require higher ${\mathrm{CO}}_2$ concentration to reach the compensation point
4. $C_3$ plants require lower ${\mathrm{CO}}_2$ concentration to reach the compensation point