IGCSE Biology 3 Views 1 Answers
Distinguish between the pollen grains of insect-pollinated and wind-pollinated flowers
Distinguish between the pollen grains of insect-pollinated and wind-pollinated flowers
Answered step-by-step
Pollen grains from insect-pollinated and wind-pollinated flowers exhibit distinct characteristics that reflect their adaptations to different modes of pollination. Here’s a comparison of the two types:
Pollen Grains of Insect-Pollinated Flowers
- Size:
- Pollen grains are generally larger in size compared to those of wind-pollinated flowers.
- Texture:
- The grains are often sticky and may have a spiny or rough surface. This stickiness helps them adhere to the bodies of insects, facilitating transfer from one flower to another.
- Weight:
- They are relatively heavier, which prevents them from being easily carried by the wind.
- Production:
- Insect-pollinated flowers produce moderate amounts of pollen, as they rely on insects for transfer rather than dispersing large quantities into the air.
- Color and Scent:
- These pollen grains are often associated with flowers that have brightly colored petals and emit a strong fragrance, attracting pollinators like bees and butterflies.
Pollen Grains of Wind-Pollinated Flowers
- Size:
- Pollen grains are typically smaller than those from insect-pollinated flowers.
- Texture:
- They are usually smooth and non-sticky, which allows them to be easily carried by air currents.
- Weight:
- Wind-pollinated pollen grains are lightweight, facilitating their travel over long distances through the air.
- Production:
- These flowers produce a large quantity of pollen to increase the likelihood that some will reach the stigma of another flower, as many grains may be lost to the environment.
- Color and Scent:
- Wind-pollinated flowers tend to have dull colors, lack fragrance, and do not produce nectar since they do not need to attract animal pollinators.
Summary Table
Characteristic | Insect-Pollinated Flowers | Wind-Pollinated Flowers |
---|---|---|
Size | Larger | Smaller |
Texture | Sticky, spiny | Smooth, non-sticky |
Weight | Heavier | Lightweight |
Production | Moderate amounts | Large quantities |
Color and Scent | Brightly colored, fragrant | Dull colors, no fragrance |
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