As compared to a $C_3$-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by $C_4$-plants:

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

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

1. Membrane potential

2. Accumulation of K ions

3. Proton gradient

4. Accumulation of Na ions 

Photosynthesis in C₄ plants is relatively less limited by atmospheric $C{O}_2$ levels because:
 

Which is wrong for cytochrome P–450?

1.  It contains Fe
2.  It is concerned with oxidation
3.  It is a pigment
4.  It is a coloured cell

What change occurs during conversion of proto chlorophyll to chlorophyll :

1.  Addition of 2H in one pyrrole ring
2.  Loss of 2H
3.  Addition of Mg
4.  Loss of Mg

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

1. Oxaloacetic acid

2. 3-phosphoglyceric acid

3. Phosphoglyceraldehyde

4. Malic acid 

Photosynthetically active radiation (PAR) represents the following range of wavelengths:
1. 450-950 nm
2. 340-450 nm
3. 400-700 nm
4. 500-600 nm 

Plants adapted to low light intensity have:

1. Higher rate of CO₂ fixation than the sun plants

2. More extended root system

3. Leaves modified to spines

4. Larger photosynthetic unit size than the sun plants

The first step for initiation of photosynthesis will be:

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