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. Magnesium and molybdenum

4. Magnesium and chlorine

In photosynthesis, the light-independent reactions take place at

1. Thylakoid lumen

2. photosystem I

3. photosystem II

4. Stromal matrix

Anoxygenic photosynthesis is characteristic of:

1. Rhodospirillum

2. Spirogyra

3. Chlamydomonas

4. Ulva

A process that makes an important difference between C₃ and C₄ plants is

1. Transpiration

2. glycolysis

3. Photosynthesis

4. Photorespiration

The correct sequence of cell organelles during photorespiration is

1. chloroplast-Golgi bodies-mitochondria

2. chloroplast-rough endoplasmic reticulum-dictyosomes

3. chloroplast-mitochondria-peroxisome

4. chloroplast-vacuole-peroxisome

In Kranz anatomy, the bundle sheath cells have :
1. thick walls, many intercellular spaces and
few chloroplasts
2. thin walls, many intercellular spaces and no
chloroplasts
3. thick walls, no intercellular spaces and
large number of chloroplasts
4. thin walls, no intercellular spaces and
several chloroplasts

PGA as the first CO₂ fixation product was discovered in 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