Which statement about pollen sources is true?

Pollen sources indeed vary by seasons, which is a crucial point in understanding pollen exposure and allergy patterns. Different plants have specific flowering times, meaning they release pollen during certain times of the year. For example, trees typically release pollen in the spring, grasses produce pollen in late spring and summer, and weeds may contribute pollen in the fall. This seasonal variation is significant for individuals who may have seasonal allergies, as their sensitivities can change depending on the pollen sources prevalent at a particular time of year.

Other options misrepresent the nature of pollen and its sources. Some suggest limited pollen production times or incorrectly assert that certain plants do not produce pollen, leading to a misunderstanding of plant biology and ecology. Recognizing that pollen sources are abundant and diverse across seasons can help in managing and mitigating allergy responses effectively.