NEET BIOLOGY

Detailed explanation-1: -In the spring or early summer, the pollen sacs release their pollen grains, each of which has two air bladders for wind dispersal. During pollination, the pollen grains sift among the scales of the female cone and land directly on the ovules, or unfertilized seeds.

Detailed explanation-2: -Male pine cones produce pollen, which is like a powder. The male cones release their pollen, which is carried around the air by blowing wind, and hopefully to another female pine cone on a different pine tree. If the pollen reaches a female pine cone, this process is called pollination.

Detailed explanation-3: -Anemophilous, or wind pollinated flowers, are usually small and inconspicuous, and do not possess a scent or produce nectar. The anthers may produce a large number of pollen grains, while the stamens are generally long and protrude out of flower.

Detailed explanation-4: -Pollination in Pinus takes place by winds. It takes place when two prothallium cells – one tube cell and one generative cell are formed which is a four celled stage.

Detailed explanation-5: -Premise of the Study: Pine pollen (Pinus spp.), along with other atmospheric particles, is dispersed by the water cycle, but this mode of dispersal requires cloud-pollen interactions that depend on taxon-specific biological properties.