Light and dark reactions, Biology

Assignment Help:

Evidence for Existence of Light and Dark Reactions

The process of photosynthesis was known in its bare outline already at the beginning of this century. But the phenomenon was still much like a mysterious black box and scientists had little idea of the events that proceeded inside the box. Unfortunately, the box could also not be opened then since photosynthesis ceased immediately if one broke up the cell or tissue where photosynthesis was going on. For a long time there was no clue, till at the turn of the century, an English plant physiologist, F.F. Blackman, working in Cambridge, started his experiments.

2363_Evidence for Existence of Light and Dark Reactions.png

Figure: Diagram to show evolution of concepts concerning the mechanism of photosynthesis.

He was the first to give the idea that photosynthesis consists of at least two kinds of reactions -the light and dark reaction(s). He estimated Ql0 of the photosynthetic reaction and found it about 2.5, provided that photosynthesis was studied under optimal conditions, especially of adequate light and supply of carbon dioxide. That photosynthesis involved some photochemical reaction(s) was of course obvious because of  the necessity  of  light and chlorophyll pigments.


Related Discussions:- Light and dark reactions

How to investigate aortic stenosis by echo cardiography, Q. How to investig...

Q. How to investigate aortic stenosis by Echo Cardiography? 2D Echo cardiogram shows the number of cusps. But presence of raphae and distorted anatomy due to calcification may

How shigellosis diseases occur in humans, How shigellosis diseases occur in...

How shigellosis diseases occur in humans Occurrence: Poor personal hygiene is a  common factor in food borne shigellosis, with shellfish, fruits and vegetables, chicken and sal

Parasternal position, Examination is begun by placing the transducer in l...

Examination is begun by placing the transducer in left parasternal region, usually in the third or fourth left intercostal space. From this position, a sector image of the heart

Aril - seed appendages, Aril - Seed Appendages It is an outgrowth that...

Aril - Seed Appendages It is an outgrowth that arises from the funicle or the testa near the raphe and covers the seed partially or completely. It is often referred to as the

Tanco beans plant, what are the origin, morphology, active constituents, us...

what are the origin, morphology, active constituents, uses and market preparation of tanco beans ?

Signs of constrictive pericarditis, Q. Signs of constrictive pericarditis? ...

Q. Signs of constrictive pericarditis? 1) Jugular venous pressure (JVP) is elevated in all patients of CP which reflects the elevated diastolic pressure of the right atrium.

Explain two divisions of meiosis, Q. What are the two divisions of meiosis ...

Q. What are the two divisions of meiosis and what are the major events that occur in those divisions? Meiosis is divided into first meiotic division, or meiosis I, and second m

Difference between blind spot and yellow spot, Difference between Blind Spo...

Difference between Blind Spot and Yellow Spot - Blind Spot Y ellow spot 1. It lies litte away from yellow spot.   2. No pi

Baby delivery, some deliveries of baby occur early na. y is it so?

some deliveries of baby occur early na. y is it so?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd