Match the following columns:

Column I (Scientist)	Column II (Discovery)
a. Shull	1. DNA model
b. Waldeyer	2. First hybrid
c. Fairchild	3. Heterosis
d. Watson and Crick	4. Chromosome

Solution(By Examveda Team)

a. Shull discovered Heterosis. He described heterosis in maize in 1908 (the term heterosis was coined by Shull in 1914. Heterosis refers to the phenomenon that progeny of diverse varieties of a species or crosses between species exhibit greater biomass, speed of development, and fertility than both parents.
b. Waldeyer discovered chromosomes. He coined 1888 the term "chromosome" to describe them. Chromosomes are threadlike structures made of protein and a single molecule of DNA that serve to carry the genomic information from cell to cell.
c. Fairchild discovered the First hybrid. In 1716 - 17 he was the first person to scientifically produce an artificial hybrid, Dianthus Caryophyllus barbatus, known as "Fairchild's Mule", a cross between a Sweet William (Dianthus barbatus) and a Carnation pink.
d. Watson and Crick have given a DNA model. The discovery in 1953 of the double helix, the twisted-ladder structure of deoxyribonucleic acid (DNA), by James Watson and Francis Crick marked a milestone in the history of science and gave rise to modern molecular biology.