Photosynthesis in Higher Plants · Question 50

Electrons from excited chlorophyll molecule of photosystem II are accepted first by

1. quinone
2. ferredoxin
3. cytochrome-b
4. cytochrome-f

The C4 plants are photosynthetically more efficient than C3 plants because

1. the CO2 efflux is not prevented
2. they have more chloroplasts
3. the CO2 compensation point is more
4. CO2 generated during photorespiration is trapped and recycled through PEP carboxylase

In leaves of C4 plants malic acid synthesis during CO2 fixation occurs in

1. bundle sheath
2. guard cells
3. epidermal cells
4. mesophyll cells

In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of

1. bundle sheath
2. phloem
3. epidermis
4. mesophyll

The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is

1. iron-sulphur protein
2. ferredoxin
3. quinone
4. cytochrome

During photorespiration, the oxygen consuming reaction(s) occur in

1. stroma of chloroplasts
2. stroma of chloroplasts and mitochondria
3. stroma of chloroplasts and peroxisomes
4. grana of chloroplasts and peroxisomes

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.