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Pollen itself is not the male gamete. [4] It is a gametophyte, something that could be considered an entire organism, which then produces the male gamete.Each pollen grain contains vegetative (non-reproductive) cells (only a single cell in most flowering plants but several in other seed plants) and a generative (reproductive) cell.
Ambrosia artemisiifolia pollen. Ragweed pollen is a common allergen. A single plant may produce about a billion grains of pollen per season, [11] [12] and the pollen is transported on the wind. It causes about half of all cases of pollen-associated allergic rhinitis in North America, where ragweeds are most abundant and diverse. [8]
The smell of freshly cut grass may evoke associations with chores. For humans, the smell of freshly cut grass is connected through olfactory memory [11] to experiences related to lawns, lawn mowers, [12] or haying. The smell may evoke nostalgia, eliciting associations with spring or summer, [13] parklands, golf courses, or preparations for ...
The immune system sees the pollen as a danger and releases antibodies that attack the allergens. That leads to the release of histamines into the blood. Histamines trigger runny noses, itchy eyes ...
Related: Here's What an Asthma Attack Actually Feels Like “This means you can ‘stack’ minor, otherwise inconsequential allergic reactions together with seasonal pollen and allergens that can ...
The plant is an important a pollen source for native bees and other insects. When a pollinating insect alights on the lower lobes of the corolla, and inserts its mouth parts into the nectar-containing lower section of the same tube, the narrow corolla portion above is straightened and snaps rapidly downward brushing pollen onto the insect's ...
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