Question

Law of limiting factor was proposed by
A. Robot Hill
B. Kolvin
C. Blackmann
D. Arnon

Answer 1

This law states and tells that when a process is carried out by depending on a number of factors or many of the factors the rate of the process is dependent only on the factor that is present in small quantity means that is limited.

Complete Answer:
This law of limiting factor is applicable when we observe the process of photosynthesis. The rate of photosynthesis is very characteristic in determining the yield of the plants including crop plants, an understanding of the factors that directly influence photosynthesis is very necessary. Photosynthesis is under the effect of both external and internal (plant) factors.

Now let us find solution from given options:
- Robot Hill: He told about Hill's reaction. He proposes the Z scheme of phosphorylation. The electron acceptor is present in this scheme.
- Kolvin: Kolvin provides a contribution to cell theory that new cells arise from pre-existing ones.
- Blackmann: In 1905, Blackman proposed the Law of Limiting factors. When several factors influence any biochemical process, then this law comes into existence. This law says that: if a chemical process is influenced by more than one factor, then its rate will be determined by the factor which is nearest to its minimal value.
- Arnon: Arnon worked on red iron sulphur protein and also named ferredoxin. He said that ferredoxin is a universal part of photosynthetic apparatus.

Our required option is C that is Blackmann.

Note: Carbon dioxide concentration is the major and most important limiting factor influencing the rate of photosynthesis. The concentration of $CO_2$ is very low in the environment (between 0.3 percent to 0.04 percent). This level of carbon dioxide is far less than the requirement for optimum photosynthesis.