The transfer of pollen from the anther to the stigma of a different flower on a separate plant is known as ___.
a. self pollination
b. wind pollination
c. animal pollination
d. cross pollination
The correct answer and explanation is:
The correct answer is d. cross pollination.
Cross pollination refers to the transfer of pollen from the anther of one flower to the stigma of a different flower, which is typically on a separate plant of the same species. This process is essential for genetic diversity in many plant species, as it involves the mixing of genetic material between different plants. Cross pollination can occur through various mechanisms, including wind, water, or animal pollinators such as insects, birds, and bats. These mechanisms help ensure that plants do not reproduce by self-pollination, which could lead to reduced genetic variation.
In cross pollination, the transfer of pollen is usually facilitated by external agents. For example, bees or butterflies might visit flowers in search of nectar and, in the process, carry pollen from one flower to another. Similarly, wind-pollinated plants, like grasses, release pollen that is carried by the wind to fertilize distant plants. In some species, birds or bats may also play a role in this process.
The main benefit of cross pollination is the introduction of genetic variation, which can make plants more resilient to disease, pests, and changing environmental conditions. Plants that rely on cross pollination are often more vigorous and have greater survival potential because of the genetic diversity produced through sexual reproduction. This also enables the plant species to adapt over time, helping to ensure their long-term survival.
In contrast, self-pollination occurs when pollen from a flower fertilizes the same flower or another flower on the same plant. While this can be efficient, it does not provide the same level of genetic diversity as cross pollination. Therefore, cross pollination is a vital process for maintaining healthy and adaptable plant populations.