Question

Two-pigment system theory of photosynthesis was proposed by
1. Hill Emerson
2. Emerson
3. Blackmann
4. Hatch an Slack

Answer 1

Correct Answer - Option 2 : Emerson

Explanation:

• Emerson & Arnold were the two scientists who worked on Chlorella and gave the two pigment system theory or two photosystems theory.
• Emerson and Arnold worked on chlorella and gave only monochromatic light, longer than 680nm wavelength, then the quantum yield is suddenly dropped down this event is called a red drop.
• Emerson found that red light (above 680nm) which is photosynthetically ineffective, can be made effective by supplementing it with beam shorter wavelength (red beam below 680nm).
• After that, the quantum yield in the combined beam is more than the sum of the total yield in two separate beams.
• Shorter than 680nm + longer than 680nm = Emerson effect.
• and, this enhancement (increase) in quantum yield by two different wavelengths of light is called the Emerson or enhancement effect.

• Hill reaction defines the chemical changes that occur in plants in the presence of light during photosynthesis. In this reaction, a series of redox reactions take place in which the solar energy is converted to chemical energy by the reduction of NADP to NADPH.
• C4 carbon fixation or the Hatch – Slack pathway is a photosynthetic process in some plants. It is the first step in extracting carbon from carbon dioxide to be able to use it in sugar and other biomolecules.
• It is one of three known processes for carbon fixation. The C4 is one of the names that refer to the 4-carbon molecule that is the first product of this type of carbon fixation.
• Blackman proposed the law of limiting factors in 1905. According to this law, when a biological process depends on a number of factors, its rate is limited by the pace of the slowest factor.