Question

how did mendel prevent self-pollination by the pea plants? he removed the pollen-bearing part of the plant. he kept male plants in a separate room. he allowed the plants to self pollinate.

Explanation:

To prevent self - pollination in pea plants, Mendel removed the anthers (the pollen - bearing part) of the pea plants. The option "He kept male plants in a separate room" is incorrect because pea plants are not strictly male or female in a way that this method would work, and pea plants are self - pollinating normally so "He allowed the plants to self pollinate" goes against the goal of preventing self - pollination.

Answer:

A. He removed the pollen - bearing part of the plant.