Thank you for reporting, we will resolve it shortly
Q.
Heterostyly as a contrivance for cross-pollination is found in
Sexual Reproduction in Flowering Plants
Solution:
Heterostyly is the presence of $2-3$ types of flower with different heights of styles and stamens. In diheterostyly (dimorphic heterostyly), there are two types of flower, pin eyed (long style and short stamens) and thrum eyed (short style and long stamens), e.g., Primula vulgaris (primrose), jasmine.