Choose the incorrect pair.

Stilt roots – pineapple

Let's break down the terms and their correct associations:

Pneumatophores – Rhizophora: Pneumatophores are specialized aerial roots that help in the exchange of gases in plants like Rhizophora (mangrove plants). These roots grow upwards, emerging from the soil, allowing the plant to absorb oxygen in waterlogged areas. This is a correct pairing.

Storage root – turnip: The storage root in plants like turnip is an enlarged root that stores food. Turnips are an example of plants with storage roots, where nutrients and energy are stored for future growth. This is also a correct pair.

Prop roots – banyan: The banyan tree has prop roots that grow from the branches and provide extra support to the tree. These roots help in stabilizing the plant, especially in large trees, making this pair correct as well.

Stilt roots – pineapple: Pineapple does not have stilt roots. Instead, it has adventitious roots, which are roots that arise from the stem or other non-root parts of the plant. These roots help the plant in anchoring itself to the ground and in absorbing water and nutrients. Therefore, pineapple is not associated with stilt roots but with adventitious roots and suckers, making this pair incorrect.

In conclusion, option D is the incorrect pair because pineapple does not have stilt roots.