AP BIOLOGY

Detailed explanation-1: -Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species. Self-pollination occurs in flowers where the stamen and carpel mature at the same time, and are positioned so that the pollen can land on the flower’s stigma.

Detailed explanation-2: -Cross-pollination occurs between the flowers of the same species of plants is known as xenogamy. Pollen grains are transferred from the anther of one plant’s flower to the stigma of another plant’s flower in xenogamy.

Detailed explanation-3: -First, cross pollination can only occur between varieties, not species. So, for example, a cucumber cannot cross pollinate with a squash. They are not the same species.

Detailed explanation-4: -The examples of the cross-pollinated plants are grasses, maple trees, tomato etc. In tomatoes the pollen grains are transmitted by the bees or the insects. Except tomato, all other plants given in the options are self-pollinated plants.