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

Difference between type ii and type i diabetes mellitus, Q. What is the dif...

Q. What is the difference between type II diabetes mellitus and type I diabetes mellitus? Type I diabetes also known as insulin-dependent diabetes (as this name is not adequate

What are the elements that constitute the stomata, What are the elements th...

What are the elements that constitute the stomata? The Stomata is made of a central opening the ostiole or slit delimited by two guard cells responsible for its closing or open

Sexual reproduction, SEXUAL REPRODUCTION You must be aware that reproduct...

SEXUAL REPRODUCTION You must be aware that reproduction is one of the distinguishing features of living beings. Reproduction is basically of two types: asexual and sexual. In ase

Explain the swab method, Explain the Swab Method? Swab method is the ol...

Explain the Swab Method? Swab method is the oldest and widely used method in food and dairy industry and was developed by W.A. Manheimer and T. Ybanez in 1917. A sterile cotton

Suction force of the plant cell, What is meant by suction force of the plan...

What is meant by suction force of the plant cell? Does the suction force facilitate or make difficult the entrance of water in the cell? Ans) The suction force (SF) is the osmot

Explain the objectives of history of mart disease, Explain the OBJECTIVES o...

Explain the OBJECTIVES of history of mart disease? After reading this unit, you should be able to: 1. Understand the importance of Cardio-vascular diseases as the leading cause

Food spoilage bacteria - lactobacillus, Food Spoilage Bacteria - Lactobacil...

Food Spoilage Bacteria - Lactobacillus Different organisms of this group, also known as "lactic acid bacteria", have different properties but all of them produce lactic acid fro

Potassium ions maintain the resting potential of neuron, Q. How do the pota...

Q. How do the potassium and sodium ions maintain the resting potential of the neuron? The plasma membrane of the neuron when at rest maintains an electric potential difference

Fidelity - synthetic characters, Fidelity - Synthetic Characters Fidel...

Fidelity - Synthetic Characters Fidelity refers to the degree to which a species is restricted in its occurrence to a particular kind of community. The species with low fideli

Describe how enzymes assay is helpful in milk and meat, Describe how enzyme...

Describe how enzymes assay is helpful in milk and meat Wheat seeds a) Determination of  α-amylase, content: an increase indicates sprouting/ germination of stored wheat;

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