Photosynthesis in Higher Plants Test - 2

Chlorophyll a, shows higher rate of photosynthesis.so, chlorophyll a is the chief pigment associated with photosynthesis.

Joseph Priestley (1733-1804) in 1770 performed a series of experiments that revealed the essential role of air in the growth of green plants.

The grana is responsible for trapping the light energy and converting it into ATP and NADPH during light reaction of photosynthesis.

Photosynthesis takes place only in the green parts of the plants, mainly the leaves.

There is maximum absorption by chlorophyll a, in the red region and so there is higher rate of photosynthesis.

In green plants H₂O is the hydrogen donor and is oxidised to O₂ . Some organisms do not release O₂ during photosynthesis. When H₂S, instead is the hydrogen donor for purple and green sulphur bacteria, the ‘oxidation’ product is sulphur or sulphate depending on the organism.

Solarisation is the inhibition of photosynthesis at very high light intensities due to photoxidation of certain compounds and destruction of chlorophyll moleucules.

Pigments are substances that have an ability to absorb light, at specific wavelengths. The chlorophylla pigment absorb lights of different wavelengths.

Splitting of the water molecule takes place on the inner side of the membrane, the protons or hydrogen ions that are produced by the splitting of water accumulate within the lumen of the thylakoids.

The pathway of photosynthesis was discovered by Melvin Calvin after experiment on single celled algae. The first stable product of C₃ cycle is a three carbon compound called PGA (phosphoglyceric acid).