Module: | Pollination & Outbreeding Devices
Q48: Consider the following statements regarding floral rewards and nectar guides in insect pollination:
1. Nectar guides are specific floral color patterns or structural lines that help direct foraging pollinators toward the nectar and reproductive organs.
2. In many insect-pollinated flowers, these nectar guides are invisible to the human eye but are clearly visible under ultraviolet (UV) light.
3. Birds and bats are the primary biological pollinators that rely extensively on these UV-reflective nectar guides for their foraging activities.
Which of the above statements is/are correct?
2. In many insect-pollinated flowers, these nectar guides are invisible to the human eye but are clearly visible under ultraviolet (UV) light.
3. Birds and bats are the primary biological pollinators that rely extensively on these UV-reflective nectar guides for their foraging activities.
Which of the above statements is/are correct?
✅ Correct Answer: A
The correct option is A. Statements 1 and 2 are correct, while Statement 3 is incorrect.
Entomophily (insect pollination) represents a highly refined mutualistic interaction.
To ensure the pollinator effectively brushes against the anthers and stigma while feeding, many flowers have evolved "nectar guides." These are structural patterns, spots, or converging lines on the petals that act like landing strips.
Causally, because the visual spectrum of primary pollinators like bees extends into the ultraviolet (UV) range, which humans cannot see, many of these intricate guides are formulated with UV-absorbing and UV-reflecting pigments.
Statement 3 is incorrect because ornithophily (bird pollination) and chiropterophily (bat pollination) do not rely on UV guides.
Birds generally have poor sense of smell but excellent vision in the red/orange spectrum, while bats are nocturnal and rely heavily on strong, fermenting odors and echolocation to find large, pale, night-blooming flowers.
Entomophily (insect pollination) represents a highly refined mutualistic interaction.
To ensure the pollinator effectively brushes against the anthers and stigma while feeding, many flowers have evolved "nectar guides." These are structural patterns, spots, or converging lines on the petals that act like landing strips.
Causally, because the visual spectrum of primary pollinators like bees extends into the ultraviolet (UV) range, which humans cannot see, many of these intricate guides are formulated with UV-absorbing and UV-reflecting pigments.
Statement 3 is incorrect because ornithophily (bird pollination) and chiropterophily (bat pollination) do not rely on UV guides.
Birds generally have poor sense of smell but excellent vision in the red/orange spectrum, while bats are nocturnal and rely heavily on strong, fermenting odors and echolocation to find large, pale, night-blooming flowers.