Difference between C3, C4 and CAM Cycle

Q. Find out what kind of development takes place in the zygote in organisms with diplontic and haplo-diplontic life cycles.

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. In $C_4$ plants photorespiration does not occur due to

1. presence of high light intensity
2. presence of Rubisco enzyme
3. increased concentration of $C{O}_2$ at enzyme site
4. presence of bundle sheath cells

Q.

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

1. C₄

2. CAM

3. Nitrogen fixer

4. C₃

Q.

Green house crops such as tomatoes and bell pepper produce higher yields. This is due to

1. $C{O}_2$ is a limiting factor to photosynthesis.

2. Tomatoes and bell pepper are not $C_3$ plants.

3. $C{O}_2$ enriched atmosphere leads to higher yields

4. Due to diffused light in green house.

Q.

What abiotic factors affect photosynthesis?

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

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

Q. Assertion : Photorespiration is found in all plants

Reason : In C4 plants, first ${\mathrm{CO}}_2$ fixation product is formed in bundle sheath cells

1. Both A and R are true and R is the correct explanation of A
2. Both A and R are true but R is not correct explanation of A
3. A is true but R is false
4. A and R are false

Q.

What are 3 limiting factors of photosynthesis?

Q. Warburg effect refers to

1. Decreased photosynthetic rate at very high oxygen concentration
2. Decreased photosynthetic rate at very low oxygen concentration
3. Increased photosynthetic rate at very high oxygen concentration
4. Increased photosynthetic rate at very low carbon dioxide concentration

Q. Growth of water hyacinth in the water body leads to the death of fishes because it

1. drains $C{O}_2$ during photosynthesis
2. drains $O_2$ during its respiration
3. promotes the growth of other plants
4. depletes the mineral nutrients in the water

Q.

A place has very scanty rainfall, the dominant plants there may be

1. Asparagus

2. Numphaea

3. Opuntia

4. Both A and C

Q. Biosynthetic phase of photosynthesis is also known as

1. Light reaction
2. Hill reaction
3. Calvin cycle
4. EMP – Pathway

Q.

Question 52
Under what conditions are $C_4$ plants superior to $C_3$?

Q.

Which of the following pathways in photosynthesis will produce only ATP but NOT NADPH?

1. glycolysis

2. Krebs cycle

3. cyclic electron pathway

4. light-independent pathway

Q. At low $C{O}_2$ concentration, photorespiration in $C_3$ and $C_4$ plants respectively is

1. high, high
2. low, medium
3. high, negligible
4. negligible, high

Q. Match Column I with Column II and choose correct option
$\begin{array}{cc}\text{Column-I}& \text{Column-II}\\ \text{A. Aestivation}& \text{(i) Winter}\\ \text{B. Hibernation}& \text{(ii) summer}\\ \text{C. Diapause}& \text{(iii) Suspended development in zooplanktons}\end{array}$

1. A (ii), B (i), C (iii)
2. A (iii), B (i), C (ii)
3. A (i), B (iii), C (ii)
4. A (i), B (ii), C (iii)

Q. The most important difference between $C_3$ and $C_4$ plants is ___________.

1. respiration
2. photorespiration
3. Calvin cycle
4. glycolysis cycle

Q. The evolutionary strategies developed by $C_4$ plants are to

1. maximize both availability and water loss
2. minimize both availability and water loss
3. maximize availability and minimize water loss.
4. minimize availability and maximize water loss

Q. How many ATP molecules are equivalent to $1NADH$ and $1FAD{H}_2$ molecule respectively.

1. 1, 2
2. 3, 2
3. 1, 3
4. 2, 3

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

Q. If we keep on increasing $C{O}_2$ concentration in air what will be the rate of photosynthesis?

Q. Find out what kind of development takes place in the zygote in organisms with diplontic and haplo-diplontic life cycles.

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.

Which of the following equations is the summary of photosynthesis?

1. 6CO₂ + 12H₂O → C₆H₁₂O₆ + 6CO₂ + 6H₂O

2. 6CO₂ + H₂O + Sunlight → C₆H₁₂O₆ + O₂ + 6H₂O

3. 6CO₂ + 12H₂O + Chlorophyll + Sunlight → C₆H₁₂O₆ + 6O₂ + 6H₂O

4. 6CO₂ + 12H₂O + Chlorophyll + Sunlight → C₆H₁₂O₆+ 6CO₂ + 6H₂O

Q. Higher productivity has been achieved for some greenhouse crops such as tomatoes and bell pepper by

1. increasing carbon dioxide concentration
2. decreasing carbon dioxide concentration
3. increasing oxygen concentration
4. decreasing oxygen concentration

Q. Photosynthesis is maximum in the region of visible light

1. Violet, Blue and Red.
2. Violet and green.
3. Orange and Red.
4. Green and red.

Q. At low $C{O}_2$ concentration, photorespiration in $C_3$ and $C_4$ plants respectively is

1. high, high
2. low, medium
3. high, negligible
4. negligible, high

Q. Describe briefly the effect of light, $C{O}_2$ concentration, and temperature on the rate of photosynthesis.

Q. Name the three types of photosynthetic pigments found in algae?