The oxygen evolved during photosynthesis comes from water molecules. Which one of the following pairs of elements involved in this reaction?

1. Manganese and chlorine

2. Manganese and potassium

3. Manganese and molybdenum

4. Magnesium and chlorine

In photosynthesis, the light-independent reactions take place at 

1. thylakoid lumen 

2. photosystem l

3. photosystem ll

4. stromal matrix

The structures that are formed by stacking of organised flattened membranous sacs in the chloroplasts are 

1. cristae

2. grana

3. stroma lamellae

4. stroma

Anoxygenic photosynthesis is characteristic of 

(1) Rhodospirillum

(2) Spirogyra

(3) Chlamydomonas 

(4) Ulva

The correct sequence of cell organelles during photorespiration is 

(1) chloroplast-Golgi bodies-mitochondria

(2) chloroplast-rough endoplasmic reticulum-dictyosomes

(3) chloroplast-peroxisome-mitochondria

(4) chloroplast-vacuole-peroxisome

PGA as the first CO₂ fixation was discovered in the photosynthesis of 

(1) bryophyte

(2) gymnosperm

(3) angiosperm

(4) algae

C₄ -plants are more efficient in photosynthesis than C₃ -plants due to 

1. higher leaf area

2. presence of larger number of chloroplasts in the leaf cells. 

3. presence of thin cuticle

4. lower rate of photorespiration

Cyclic-photophosphorylation results in the formation of 

1. NADPH

2. ATP and NADPH

3. ATP, NADPH and O₂

4. ATP

THe C₄ -plants are photosynthetically more efficient than C₃ -plants because

(1) the CO₂ compensation point is more

(2) CO₂ generated during photorespiration is trapped and recycled through PEP carboxylase

(3) the CO₂ efflux is not prevented

(4) they have more chloroplasts.

Electrons from excited chlorophyll molecule of photosystem-II are accepted first by

1. cytochrome-b

2. cytochrome-f

3. quinone

4. ferredoxin