$A$ true-breeding pea plant can be obtained by .......

Mendel's work remained unrecognized for a long time due to:
$I.$ Communication was not easy.
$II.$ The concept of factors which did not blend was not accepted.
$III.$ The use of mathematics to explain biological problems was unacceptable.
$IV.$ He could not provide any physical proof for the existence of factors.
Choose the right combination.

Mendel crossed true-breeding tall and dwarf plant varieties in his experiment. The tall character was dominant and the dwarf character was recessive. The recessive character appeared in:

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

How many pairs of contrasting characters in pea plants were chosen by Mendel for his experiments?

Which of these is a dominant factor?