All of the following interactions with the physical environment play a role in aiding plant reproduction, except –

Responses

seeds are carried by the wind and scattered across a landscape.

StartFragment, seeds are carried by the wind and scattered across a landscape.,

the pollen of flowers attaches to the legs of insects and is carried to other flowers

StartFragment, [endif] the pollen of flowers attaches to the legs of insects and is carried to other flowers,

A bristles on some seeds attach to the hides of animals and are carried to new places

StartFragment, [if !supportLists] A [endif] bristles on some seeds attach to the hides of animals and are carried to new places,

guard cells open the stoma of plants, allowing air to enter a plant’s leaf.

In this list, the interaction of guard cells opening the stoma of plants and allowing air to enter a plant's leaf does not play a direct role in aiding plant reproduction. This process is more related to the plant's ability to exchange gases for photosynthesis and respiration.