EVERYDAY SCIENCE

Detailed explanation-1: -Pollen grains of some plants which are present in the air cause allergy and are called “aeroallergens” e.g., Parthenium (Carrot grass), Sorghum.

Detailed explanation-2: -Worst Plants for Allergies Cypress, jasmine vine, juniper, wisteria. Alder, ash (male), aspen (male), beech, birch, box elder (male), cedar (male), cottonwood (male), elm, hickory, red and silver maples (male), mulberry (male), oak, olive, palm (male), pecan, pine, poplar (male), sycamore, walnut, willow (male).

Detailed explanation-3: -Ragweed plants are notorious for being the most common weed pollen allergens and are most active between late spring and autumn months. Apart from ragweed, sagebrush and tumbleweed are also common weed pollen allergens.

Detailed explanation-4: -In angiosperms, pollen is produced by the anthers of the stamens in flowers. In gymnosperms, it is formed in the microsporophylls of the microstrobili (male pollen cones). Pollen consists of one or more vegetative cells and a reproductive cell. A pollen grain itself is not the male gamete.