An herbivore species would most likely exert strong selective pressure on its host plant species if the herbivore eats

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A herbivore species that eats a large part of the plant biomass, including the entire flower, would exert strong selective pressure on its host plant species because it would directly affect the reproductive success of the plant. The herbivore would be removing key organs essential for the production of seeds and the continuation of the plant species. This creates strong selection pressure for plants that can resist herbivory or compensate for loss of organs. In contrast, herbivores that eat a small percentage of the plant biomass or only eat leaves may not have as much impact on the reproductive success of the plant, causing weaker selective pressure.

An Herbivore Species Would Most Likely Exert Strong Selective Pressure