Photosynthesis in Higher Plants

Chemiosmotic theory of ATP synthesis in the chloroplasts and mitochondria is based on

1. Proton gradient
2. Membrane potential
3. Accumulation of Na+ ions
4. Accumulation of K+ ions

In C3 plants, the first stable product of photosynthesis during the dark reaction is

1. malic acid
2. oxaloacetic acid
3. 3-phosphoglyceric acid
4. phosphoglyceraldehyde

Plants adapted to low light intensity have

1. larger photosynthetic unit size than the sun plants
2. higher rate of CO2 fixation than the sun plants
3. more extended root system
4. leaves modified to spines.

Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?

1. Blue and green
2. Green and red
3. Red and violet
4. Violet and blue.

Which one of the following is wrong in relation to photorespiration?

1. It occurs in chloroplast
2. It occurs in day time only
3. It is a characteristic of C4 plants
4. It is a characteristic of C3 plants.

In sugarcane plant 14CO2 is fixed to malic acid, in which the enzyme that fixes CO2 is

1. ribulose bisphosphate carboxylase
2. phosphoenolpyruvic acid carboxylase
3. ribulose phosphate kinase
4. fructose phosphate.

Stomata of CAM plants

1. are always open
2. open during the day and close at night
3. open during the night and close during the day
4. never open.

Which element is located at the centre of the porphyrin ring in chlorophyll?

1. Calcium
2. Magnesium
3. Potassium
4. Manganese

Which one of the following concerns photophosphorylation?

1. ADP + AMP Light energy ATP
2. ADP + Inorganic PO4 Light energy ATP
3. ADP + Inorganic PO4 ATP
4. AMP + Inorganic PO4 Light energy ATP

Which of the following absorbs light energy for photosynthesis?

1. Chlorophyll
2. Water molecule
3. O2
4. RuBP

In photosynthesis energy from light reaction to dark reaction is transferred in the form of

1. ADP
2. ATP
3. RuDP
4. chlorophyll

Which pigment system is inactivated in red drop?

1. PS-I and PS-II
2. PS-I
3. PS-II
4. None of the above

Which pair is wrong?

1. C3-maize
2. C4-Kranz anatomy
3. Calvin cycle-PGA
4. Hatch and Slack cycle-OAA

Which is the first CO2 acceptor enzyme in C4 plants?

1. RuDP carboxylase
2. Phosphoric acid
3. RuBisCO
4. PEP- carboxylase

For assimilation of one CO2 molecule, the energy required in form of ATP and NADPH2 are

1. 2 ATP and 2 NADPH2
2. 5 ATP and 3 NADPH2
3. 3 ATP and 2 NADPH2
4. 18 ATP and 12 NADPH2

For the synthesis of one glucose molecule the Calvin cycle operates for

1. 2 times
2. 4 times
3. 6 times
4. 8 times

The first step for initiation of photosynthesis will be

1. photolysis of water
2. excitation of chlorophyll molecules due to absorption of light
3. ATP formation
4. glucose formation