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- #Class 12
In which of the following pollination takes place by lever mechanism?
Option: 1
Salvia
Option: 2
Ficus
Option: 3
Ocimum
Option: 4
Antirrhinum
Answers (1)
As we have leant:
Salvia: Turn Pipe or Lever Mechanism:
- Salvia has got a bilabiate corolla with two fertile epipetalous stamens.
- The stamens and pistil remain hidden under the upper lip.
- The flower is protandrous and the short epipetalous filament of each stamen is connected to the peculiar distractile connective which is long and lever-like, its two unequal arms separating the two anther lobes.
- The basal lobe of the anther is sterile while the upper lobe is fertile.
- A slight pressure on the lower anther lobe brings the upper lobe down.
- Salvia is bee-pollinated.
- Bees alight on the lower lip of the corolla and enter the flower to reach the nectary at the end of the corolla tube.
- In so doing, they push against the united lower anther lobes thereby bringing down the fertile anther lobes which dust the bee’s back with pollen.
- When the pistil of the flower becomes ripe, the stigmas protrude out of the upper lip so that any bee entering the flower brushes against the stigma thereby pollinating it with pollen already on its back.
Hence, the correct answer is option a.
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