Question

plants reproduce sexually. which of these is necessary for plants to reproduce?
a single - celled parent
a fungus
a pollinator
a clone of itself

Explanation:

In sexual reproduction of plants, pollination is crucial. Pollinators like bees, butterflies etc. transfer pollen from the anther of a flower to the stigma of another flower (or the same flower in some cases), facilitating fertilization. A single - celled parent is related to asexual reproduction, a fungus is not a necessary component for plant sexual reproduction, and a clone is also related to asexual reproduction methods like vegetative propagation.

Answer:

a pollinator