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

Mark the odd one (w.r.t. true breeding line).

In the case of $PTC$ tasters and non-tasters in humans,$T$ represents the dominant allele and $t$ represents the recessive allele. Which of the following genotypes is unable to taste $PTC$?

Gregor Mendel was born in which century?

If a dwarf plant is treated with a growth hormone and then crossed with a dwarf plant,what will be the phenotype of the $F_1$ generation?

Which contributed to Mendel's success?
$I.$ Selection of pea plant
$II.$ Knowledge of history
$III.$ One character at one time
$IV.$ His statistical knowledge
Choose the correct option.