Match the following columns:

Column I (Name of the scientist)	Column II (Area of the work)
a. Jones	1. Law of homologous series in variation
b. Tysdal	2. Poly cross test
c. Muller	3. Double cross maize hybride
d. Vavilov	4. X-ray induced mutations

Solution(By Examveda Team)

a. Jones worked in the area of double cross maize hybrid.
Donald Forsha Jones (16^th April 1890 - 19^th June 1963) was a United States maize geneticist and practical corn breeder at the Connecticut Agricultural Experiment Station, New Haven. Beginning at the station in 1914, he made high-yielding hybrid corn practical with his invention of the double-cross hybrid.
b. Tysdal proposed the technique of the Poly cross test.
Poly cross is a cross in which the female parent is known but the male may belong to any of several available strains and which is used in the production of new lines of some economic plants.
c. Muller gave his contribution to X-ray-induced mutations.
Muller concluded that the x-ray exposure caused lethal mutations in the offspring of the x-ray-treated flies. He also found that mutations occurred in both the male and female flies when exposed to x-rays, indicating that both sexes were vulnerable to radiation-induced mutations.
d. Vavilov worked on the Law of homologous series in variation.
Species and genera are characterized by similar homologous series in their genetic variability. It is possible that by knowing a series of characters in the variability of one species, one may foresee parallel homologous characters for other related species and genera.