Two students suggested that the wallflower cannot produce fruit unless pollination has taken place. Their
teacher showed them how to prevent bees reaching
the flowers by covering the flowers in a fine mesh bag,
and how to transfer pollen with a fine paintbrush.
a Describe how the students could carry out an
experiment to test their hypothesis
b Suggest how they could modify their experiment to
test whether self- or cross-pollination produced
more seeds in the wallflower
In your answer be sure to describe any controls which
they could include, and any steps they could take to
ensure that their results were valid