Mendel's success in discovering the laws of inheritance can be attributed to several factors, but the most important one is his approach to experimentation. His approach was unique and different from the contemporary methods of experimentation.

Consideration of one character at a time:
Mendel focused on studying one trait at a time, rather than studying multiple traits simultaneously. This allowed him to maintain a clear focus on the traits he was studying and avoid confusion caused by multiple traits. He chose to study pea plants, which have seven distinct traits that can be easily identified and studied. By choosing to study one trait at a time, Mendel was able to identify patterns of inheritance that were not noticeable before.

Qualitative analysis of data:
Mendel used a qualitative analysis of data, which means he focused on identifying the presence or absence of a trait rather than measuring the quantity of the trait. This approach allowed him to identify clear and distinct patterns of inheritance. He counted the number of offspring with a particular trait and used statistical analysis to determine the ratios of dominant and recessive traits in the offspring.

Observation of distinct inherited traits:
Mendel observed seven distinct inherited traits in pea plants, including seed color, seed shape, flower color, and plant height. He carefully observed the traits and recorded his findings. This allowed him to identify patterns of inheritance that were not noticeable before.

His Knowledge of biology:
Mendel had a good understanding of biology, which helped him to interpret his findings and draw conclusions about patterns of inheritance. He was familiar with the concepts of genetics, heredity, and variation. This knowledge allowed him to design experiments that were effective in studying inherited traits.

In conclusion, Mendel's success can be attributed to his focus on studying one trait at a time, qualitative analysis of data, observation of distinct inherited traits, and his knowledge of biology. These factors allowed him to discover the laws of inheritance, which revolutionized the field of genetics.

The reasons for Mendel’s success are as follows:

1. Mendel studied the inheritance of one character at a time, unlike his predecessors who considered the organism as a whole.

2. The parent plants undergoing crossing belonged to pure lines and had sharply visible contrasting characters.

3. His knowledge in statistics helped him to maintain accurate records of all the experiments of findings and analyzed them carefully.

4. He grew pure lines in separate plots and conducted experiments by crossing two plants from pure strains.

5. He carried out his experiments up to three generations.

6. He selected genetically pure plants for his experimentsg by performing a series of sell crossing tests.

7. All these experiments were conducted with utmost care and meticulous planning.