Mendel selected pea plants for his experiments because of $..........$.

The cause of variation is hidden in the process of $.....P.....$ - this knowledge was acquired by humans in $.....Q.....$.
$\quad \quad P \quad\quad\quad Q$

Given below are two statements:
Statement $I$:
Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.
Statement $II$:
Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour,flower colour,pod shape and colour,flower position and stem height.
In the light of the above statements,choose the correct answer from the options given below:

Change of male and female parents during crosses is known as

With reference to the Mendelian experiments,which one of the following statements is $INCORRECT$?

Which of the following is considered as a recessive character of Mendel?