Pollination mechanism in Salvia is a unique lever type. The flowers in this genus are arranged in thyrsus inflorescence and they are attractive and well adapted for cross pollination through the agency of insects. In this lever mechanism of pollination, the corolla has a spreading upper lip, which acts as a landing place for the insect. When the insects land on the lower lip of the corolla and in its endeavour to obtain nectar that is secreted by the hypogynous disc, pushes the sterile lobes of the stamen inwards. Due to this the upper half of the connective with the fertile lobes act as a lever. Then the anther lobe comes down and shed the pollen on the back of the insect.
Thus, the correct answer is option C.

Lever-mechanism of Pollination in Calotropis

The lever-mechanism of pollination is a unique process found in certain plants, including Calotropis, which is a member of the milkweed family. In this process, the pollinators, which are usually insects, are attracted to the flowers by their scent and color. Once they land on the flower, they trigger a lever-like structure that causes the pollen sacs to be deposited on the pollinator's body.

The process of lever-mechanism of pollination in Calotropis can be explained in the following steps:

1. Attraction: The flowers of Calotropis are large and colorful, with a strong scent that attracts pollinators such as bees, butterflies, and moths.

2. Landing: When the pollinator lands on the flower, it triggers a lever-like structure that is located near the base of the flower.

3. Lever: The lever structure in Calotropis consists of two long, narrow petals that are attached to the base of the flower. When the pollinator lands on the flower, it pushes down on the lever, causing the two petals to move inward.

4. Pollen: As the two petals move inward, they push against the pollinator's body, causing the pollen sacs to be deposited on its legs or abdomen.

5. Transport: The pollinator then flies to another flower, where the pollen sacs are transferred to the stigma, allowing fertilization to occur.

In conclusion, the lever-mechanism of pollination in Calotropis is a unique process that allows for efficient transfer of pollen from one flower to another. This process ensures the survival of the plant species and is an excellent example of the complex interactions between plants and their pollinators.