If you ran the Engelmann experiment without passing light through a prism, what would you predict?
  
1. The results will be unaffected.
2. Even distribution along the length.
3. Accumulation only in red wavelength zone.
4. More cluster in the middle than at the ends.

The correct statements about photosynthesis include:

In cyclic electron flow:
1. the electron begins in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin and then to plastoquinone, then to cytochrome b6f, and then to plastocyanin before returning to chlorophyll.
2. the electron begins in a pigment complex called photosystem II, passes from the primary acceptor to ferredoxin and then to plastoquinone, then to cytochrome b6f, and then to plastocyanin before returning to chlorophyll.
3. the electron begins in a pigment complex called photosystem I, passes from the primary acceptor to ferredoxin and then to plastocyanin, then to cytochrome b6f, and then to plastoquinone before returning to chlorophyll.
4. the electron begins in a pigment complex called photosystem II, passes from the primary acceptor to ferredoxin and then to plastocyanin, then to cytochrome b6f, and then to plastoquinone before returning to chlorophyll.

Study the given diagram where ‘X’ represents the absorption spectrum of chlorophyll a and ‘Y’ represents the action spectrum of photosynthesis. The conclusions that can be drawn include:
  

Identify the correct relationship between photosynthesis and cellular respiration:
1. while only autotrophs photosynthesize, only heterotrophs respire
2. while photosynthesis uses solar energy to convert inorganics to energy-rich organics, respiration breaks down energy-rich organics to synthesize ATP
3. photosynthesis occurs in day time and respiration at night
4. ATP cannot be formed during photosynthesis, it can only be formed in cellular respiration.

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

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

Identify the incorrect statement regarding non-cyclic photophosphorylation:
1. Being a light reaction, non-cyclic photophosphorylation occurs in the thylakoid membrane.
2. The photosystem II complex replaces its lost electrons from an external source.
3. It generates both ATP and NADPH
4. When the chloroplast runs low on ATP for the Calvin cycle, the plant may shift from cyclic to non-cyclic electron flow.

Identify the incorrect statement regarding the light independent reactions in photosynthesis:
1. These reactions occur in the stroma.
2. They use the products (ATP and NADPH) of light-dependent reactions.
3. They occur in the absence of light and hence are called the dark reactions.
4. The three phases are carbon fixation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration.

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 antenna pigment molecules:
1. are responsible for photolysis of water to release oxygen
2. harvest photons and transfer light energy to the reaction-center chlorophyll
3. transfer electrons to chlorophyll a
4. transfer electrons to ferredoxin and then NADPH