EVERYDAY SCIENCE

Detailed explanation-1: -In flowering plants, vegetative cells produce pollen tubes, which divide to form two sperm nuclei. When pollen lands on a compatible pistil or female cone, pollen germinates, forming pollen tubes and transferring sperm to the ovule, which contains the female gametophyte.

Detailed explanation-2: -Pollination is the transfer of pollen from an anther to a stigma, either by wind or by pollinators.

Detailed explanation-3: -During sexual plant reproduction, pollen grains are produced in the anthers and deposited on the stigma of the flower. The pollen grains hydrate and each one sends out a pollen tube that grows by tip growth and carries the two sperm cells through the female tissues.

Detailed explanation-4: -Cross-pollination is the transfer of pollen from the anther of one flower to the stigma of another flower on a different individual of the same species.