C. B. van Niel proved that:

1.	Plants produce glucose when they grow.
2.	Blue and red light are effective for photosynthesis.
3.	It is only the green parts of the plants that could release oxygen.
4.	Hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates.

It can be correctly said about the relation between the absorption spectra of various pigments and the action spectrum of photosynthesis that:

The NADP reductase enzyme is located:

The ATP synthase consists of two parts where:

The bundle sheath cells are characterized by:

The primary ${\mathrm{CO}}_2$ acceptor in ${\mathrm{C}}_4$ plants is:
1. RuBP in mesophyll cells
2. RuBP in bundle sheath cells
3. PEP in mesophyll cells
4. PEP in bundle sheath cells

The ${\mathrm{C}}_3$ pathway:
1. is common to all plants
2. takes place in mesophyll cells in ${\mathrm{C}}_4$ plants
3. takes place in bundle sheath cells in ${\mathrm{C}}_3$ plants
4. does not take place in CAM plants

In ${\mathrm{C}}_4$ pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:

The 2-carbon compound formed in photorespiration is:

Photorespiration is a wasteful process. Why is it so?