The number of contrasting characters studied by Mendel for his experiments was

The first generation produced after a cross is known as:

Considering the four chromosomes in Pisum sativum, how many traits did Mendel identify for his experiments?

Consider the following four statements $I, II, III$ and $IV$ and select the correct statement:
$I.$ Mendelian experiments have a large sampling size, which gave greater credibility to the data that he collected.
$II.$ Recessive allele influences the appearance of the phenotype even in the presence of a dominant allele.
$III.$ Mendel analysed qualitative characters in garden pea.
$IV.$ In $F_2$-generation of a Mendelian monohybrid cross, the tall and dwarf traits were identical to their parental types and show no blending inheritance.

Mendel conducted his hybridization experiments for how many years?

On which of the following plants did Mendel perform his experiments?