The reaction that is responsible for the primary fixation of CO₂ is catalysed by

1.  RUBP carboxylase

2.  PEP carboxylase

3.  RuBP carboxylase and PEP carboxylase

4.  PGA synthase

When CO₂ is added to PEP, the first stable product synthesized is

1. pyruvate

2. glyceraldehyde-3-phosphate

3. phosphoglycerate

4. oxaloacetate

The enzyme that is not found in a C₃ plant is

1.  RuBP carboxylase

2.  PEP carboxylase

3.  NADP reductase

4.  ATP synthase

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

1.  PS II, plastoquinone, cytochromes, PS I, ferredoxin

2.  PS I, plastoquinone, cytochromes, PS II, ferredoxin

3.  PS I, ferredoxin, PS II

4.  PS I, plastoquinone, cytochromes, PSII, ferredoxin

Splitting of water is associated with

1.  photosystem I

2.  lumen of thylakoid

3.  both photosystems I and II

4.  inner side of thylakoid membrane

PEP is primary CO₂ acceptor in

1.  C₄ plants

2.  C₃ plants

3.  C₂ plants

4.  both C₃ and C₄ plants

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

1. Chlorophyll a 

2. Chlorophyll b 

3. Xanthophyll 

4. Carotenoid 

Which range of wavelength (in nm) is called photosynthetically active radiation (PAR) ? 

1.  100 - 390

2.  390-430

3. 400 - 700 

4. 760- 100,00

Which light  range is most effective in photosynthesis ? 

1.  Blue 

2. Green 

3. Red 

4. Violet 

Chemosynthetic bacteria obtain energy from 

1. Sun 

2. Infra red rays 

3. Organic substances 

4. Inorganic chemicals