Choose the incorrect couplet.
A B
Plants with tap root system Plants with adventitious root system
Leaves with reticulate venation leaves with reticulate venation
Actinomorphic flower Zygomorphic flower
compound leaves leaves with reticulate venation

Easy

Solution

Compound leaves and reticulate venation deal with different characters. Compound leaf is type of leaf and reticulate venation is type of venation. Actinomorphic and zygomorphic flowers are related to symmetry of flower, Reticulate and parallel venation are related to venation, tap root system and adventitious root system and tap root system are related to type of root system. A couplet should have contrasting traits belonging to same character.

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A	B
Plants with tap root system	Plants with adventitious root system
Leaves with reticulate venation	leaves with reticulate venation
Actinomorphic flower	Zygomorphic flower
compound leaves	leaves with reticulate venation