Assertion(A):	Plants photosynthesise during the day, whereas they respire at night.
Reason(R):	Photosynthesis can occur in the presence of sunlight whereas respiration cannot.

1.	Both (A) and (R) are true and (R) is the correct explanation of (A)
2.	Both (A) and (R) are true but (R) is not the correct explanation of (A).
3.	(A) is true but (R) is false.
4.	Both (A) and (R) are false.

Chloroplasts:

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:

The enzymes for synthesis of organic molecules, in autotrophic bacteria, are located:

The absorption spectrum shown in the given figure can be of:

   
1. Chlorophyll a
2. Chlorophyll b
3. Carotenoids
4. Either 1 or 2

The number of electrons that need to be transported during cyclic photophosphorylation in sulphur bacteria, to produce one molecule of ATP is:
1. one
2. two
3. three
4. four

The pH of the space of thylakoid of isolated chloroplast is decreased and then transferred in the dark to a pH-8 solution. The result would most likely be:
 

A possible purpose of photorespiration may be:

The following diagram shows bundle sheath cells with “special” types of chloroplasts. What is special about them?
  

What conclusion can be drawn from the finding that while some bacteria have only photosystem I, cyanobacteria have both?