Differentiate between wind pollinated and insect pollinated flowers.
Correct Answer :
Wind pollinated - Pollen grains are light non sticky /well exposed stamens/ Large feathery stigma / single ovule in each flower / Small flowers packed in inflorescence
Insect pollinated - Pollen grains sticky/ Floral rewards / Fragrant / Nectar rich / Large Flower
Solution :
The correct answer/option is:
Wind pollinated - Pollen grains are light non sticky /well exposed stamens/ Large feathery stigma / single ovule in each flower / Small flowers packed in inflorescence
Insect pollinated - Pollen grains sticky/ Floral rewards / Fragrant / Nectar rich / Large Flower
Pollination is the transfer of pollen grains from the male part of a flower (anther) to the female part (stigma). Depending on the agent involved in this transfer, flowers have evolved distinct structural adaptations to maximize their pollination success. Here is a detailed breakdown of the differences between wind-pollinated (anemophilous) and insect-pollinated (entomophilous) flowers:
1. Wind Pollinated Flowers (Anemophily)
Since wind is a non-directional and abiotic (non-living) agent, these flowers must rely on passive air currents to disperse and receive pollen. Their main adaptations include:
• Pollen Grains: They are produced in massive quantities because many are lost in transit. They are light in weight and non-sticky so that they can easily float and be carried long distances by gentle breezes.
• Stamens: The stamens are well-exposed or versatile, hanging outside the flower so that the pollen grains can easily be shaken off and swept away by the wind.
• Stigma: The stigma is typically large, sticky, and feathery. This structure acts like a net to capture the wind-borne pollen grains from the surrounding air.
• Ovary and Ovules: They often have a single ovule per ovary. Having one ovule is highly efficient since wind pollination is a random process, making it unlikely for multiple pollen grains to land on the same stigma.
• Inflorescence: Individual flowers are usually very small and inconspicuous. To make up for this, they are packed closely together in clusters (inflorescences) to increase their chances of catching pollen.
2. Insect Pollinated Flowers (Entomophily)
Insects are active and biotic (living) pollinating agents. To ensure pollination, flowers must actively attract insects and ensure that pollen adheres to the insect's body. Their adaptations include:
• Pollen Grains: The pollen grains are typically sticky or covered with a rough coat (like pollen kitt) so that they readily stick to the hairy body of an visiting insect.
• Floral Rewards: To entice insects, the flowers offer rewards such as sweet nectar (nectar rich) and edible pollen grains.
• Attractors (Fragrance and Size): These flowers are generally large, showy, and brightly colored. If the individual flowers are small, they group together to form a highly visible display. They also produce distinct fragrances to guide insects from a distance.
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