O Level Biology 6 Views 1 Answers
Compare the flower structure and the pollen from insect-pollinated and wind-pollinated flow
Compare the flower structure and the pollen from insect-pollinated and wind-pollinated flow
Answer
The structures and pollen characteristics of insect-pollinated and wind-pollinated flowers differ significantly due to their distinct reproductive strategies. Below is a comparison of these two types of flowers based on their flower structure and pollen features.
Comparison of Flower Structure
| Feature | Insect-Pollinated Flowers | Wind-Pollinated Flowers |
|---|---|---|
| Petals | Large, brightly colored to attract insects | Small, dull, often green or brown |
| Scent and Nectar | Present; sweet-smelling nectar attracts insects | Absent; no need to attract pollinators |
| Anthers | Located inside the flower; stiff and firmly attached to brush against insects | Hanging outside the flower on long filaments for easy pollen release |
| Stigma | Sticky, located inside the flower to catch pollen from visiting insects | Feathery and large, positioned outside to catch airborne pollen |
| Pollen Quantity | Moderate amount produced; efficient transfer by insects | Large quantities produced; most are not transferred, so higher production increases chances of successful pollination |
Comparison of Pollen Characteristics
| Feature | Insect-Pollinated Pollen | Wind-Pollinated Pollen |
|---|---|---|
| Size | Larger, often sticky or spiky | Smaller, smooth, and lightweight |
| Shape | Irregular shapes with spikes/hooks for adhesion | Generally round or oval, designed for wind dispersal |
| Quantity | Moderate quantity; sufficient for insect transfer | Very high quantity; compensates for low transfer rates |
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