Identify the correctly matched rows:
C3 | C4 | ||
I. | Productivity | Low | High |
II. | CO2 compensation point | Low | Low |
III. | Temperature optimum | 20 – 250 C | 30 – 450 C |
1. Only I and II | 2. Only I and III |
3. Only II and III | 4. I, II and III |
Except for plants in shade or in dense forests, light is rarely a limiting factor in nature. This is because:
1. | Dark reactions do not depend on light |
2. | The rate of photosynthesis can be increased by higher carbon dioxide and lower temperatures even in low light conditions |
3. | Light saturation occurs at 10 % of full sunlight |
4. | Carbon fixation is independent of enzymes |
The correct sequence of flow of electrons in the light reaction is
1. | PSII, plastoquinone, cytochromes, PS I, ferredoxin |
2. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
3. | PSI, ferredoxin, PS II, |
4. | PSI, plastoquinone, cytochromes, PS II, ferredoxin |
The reactions of the Calvin cycle can take place as long as which of the following products of the light dependent reactions are available?
1. | Water and Glucose | 2. | Water and ATP |
3. | Oxygen and Carbon dioxide | 4. | ATP and NADPH |
The factors that can be limiting for the light independent reactions of photosynthesis are:
1. , temperature, and light
2. , light, and water
3. water, temperature, and
4. oxygen, water, and temperature
The absorption spectrum in the given diagram will be of:
1. | Chlorophyll a | 2. | Chlorophyll b |
3. | Carotenoids | 4. | Retinol |
The wavelengths of light most useful in photosynthesis are:
1. | green and orange | 2. | red and blue |
3. | infrared and yellow | 4. | red and green |
Oxygen, during oxygenic photosynthesis, is produced during:
1. cyclic photophosphorylation
2. the light-dependent reactions involving photosystems I and II
3. Calvin cycle
4. the Krebs cycle
In oxygenic photosynthesis, the release of oxygen is a byproduct of:
1. chemiosmosis
2. reducing by FNR
3. splitting the water molecules
4. cyclic photophosphorylation
The greatest problem with photorespiration is faced by:
1. | C4 plants | 2. | C3 plants |
3. | CAM plants | 4. | purple sulfur bacteria |