Photosynthesis in Higher Plants

In photosystem I, the first electron acceptor is

1. an iron-sulphur protein
2. ferredoxin
3. cytochrome
4. plastocyanin

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

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

Photosynthetic Active Radiation (PAR) has the following range of wavelengths.

1. 340–450 nm
2. 400–700 nm
3. 500–600 nm
4. 450–950 nm

Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

1. effective pumping of CO2 into bundle sheath cells
2. RuBisCo in C4 plants has higher affinity for CO2
3. four carbon acids are the primary initial CO2 fixation products
4. the primary fixation of CO2 is mediated via PEP carboxylase.

Chlorophyll in chloroplasts is located in

1. Stroma
2. Grana
3. Pyrenoid
4. Both (1) and (3)

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.