Which one of the following did not constitute the seven contrasting pairs studied by mendel in pea plant? A. shape of the leaves
B. height of the plants
C. colour of the flower
D. position of the flower ​

A. Shape of the leaves

Explanation:

Mendel chose seven characters of the pea plant to study.

They are:

1. Flower colour

2. Flower position 

3. Stem length 

4. Pod shape 

5. Pod colour 

6. Seed shape

7. Seed colour 

Shape of leaves was not observed by Mendel.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.