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

Define protein requirements of preschoolers, Define protein requirements of...

Define protein requirements of Preschoolers? For Preschoolers the protein requirements of children of various age groups are computed by the factorial method as employed by FAO

Photoreceptors, Photoreceptors Photoreceptors are concerned in absorpt...

Photoreceptors Photoreceptors are concerned in absorption of light by photosensitive pigments. The chemical change involved produces the impulse concerned in the nerve cells.

Write a short note on muscular system, Write a short note on muscular syste...

Write a short note on muscular system? The muscular system provides mobility and support to the body. There are three types of muscle tissue: skeletal, smooth, and cardiac. Th

Embrylogical devlopment of hypospadias, Embrylogical Devlopment of Hypos...

Embrylogical Devlopment of Hypospadias The development of the penis and scrotum is intluenced by the testes. In the absence of the testes, the female structures of the

Name three effects that inbreeding can have on a population, Name three eff...

Name three effects that inbreeding can have on a population. Inbreeding can decrease the number of offspring produced, increase susceptibility to disease, reduce genetic varia

Explain the term mutations, Explain the term Mutations? Mutations are c...

Explain the term Mutations? Mutations are changes in the genetic structure of an organism that occur at random or are the results of environmental causes. The majority of new m

Can pathophysiology causes cardiovascular disease, Q. Can Pathophysiology c...

Q. Can Pathophysiology causes cardiovascular disease? Cigarette use activates platelets, increases circulating fibrinogen, increases heart rate, and elevates blood pressure. It

Describe coping skill and coping mechanism, Q. Describe Coping Skill and Co...

Q. Describe Coping Skill and Coping Mechanism? Coping Skill is a tool which may be used by individuals in any difficult situation like solving a problem by choosing best soluti

Genetic, what are the limitation of mendelian experiment

what are the limitation of mendelian experiment

Eye lens, LEN S -  In lumen of eye ball, a large colourless, transp...

LEN S -  In lumen of eye ball, a large colourless, transparent, more convex on back side, lens present covered by lens capsule. When white tissues are formed in it, it b

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