Identify the correctly matched rows:

		C3	C4
I:	Productivity	Low	High
II:	CO2 compensation point	Low	Low
III:	Temperature optimum	20 – 250 C	30 – 450 C

 

1.	Only I and II	2.	Only I and III
3.	Only II and III	4.	I, II and III

Except for plants in shade or in dense forests, light is rarely a limiting factor in nature. This is because:

Which pigment acts directly to convert light energy to chemical energy ?

Which light range is most effective in photosynthesis?

The correct sequence of flow of electrons in the light reaction is

The enzyme that is not found in a ${\mathrm{C}}_3$ plant is
1. RuBP Carboxylase
2. PEP Carboxylase
3. NADP reductase
4. ATP synthase

Chloroplasts:
I. have their own DNA and make all proteins needed by them
II. have a uniparental inheritance
III. cannot be made by the plant cell
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct

Carbon dioxide tagged with heavy isotope of oxygen was fed to a green algae in the presence of sunlight. Which of the following compounds would not be tagged with this isotope?

Light reaction of photosynthesis does not include:
1. chemiosmosis
2. oxygen liberation
3. charge separation
4. electron transport

Robin Hill discovered that the isolated chloroplasts from plants can release oxygen when they are illuminated by sunlight in the presence of a suitable electron acceptor. This showed:
I. oxygen (${\mathrm{O}}_2$) is produced by a reaction that is separate from carbon dioxide (${\mathrm{CO}}_2$) fixation.
II. the reaction in which oxygen is released requires light.
III. the light dependent reaction of photosynthesis is a result of a series of redox reactions.
1. I and II only
2. I and III only
3. II and III only
4. I, II and III