Plant Reproduction System

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Plants can reproduce two ways, via insects or the wind. Insect-pollinated flowers usually have bright colours and a scent to attract the insects while wind-pollinated plants are usually absent of both bright colours and scent. The flower is comprised of many different parts, each with a different function, it’s the organ of reproduction in a plant and it is usually a hermaphrodite with the ovary deep in the plant.

Flower Structure

CalyxThe outer leaves of the flower, usually green.To protect the flower.
CorollaA.k.a. the petals, attract insect and protect the carpels and stamen.Form the outer layer of the flower.
Androecium (male organ)A.k.a. Stamen, which in turn holds the anthers on topProduces pollen (male gametes)
Gynoecium (female organ)A.k.a. The carpels, an enclosed structure usually central in the flowerAccept pollen and develop ovules.

Pollen Grain Formation

Pollen is formed within the pollen sac of the anther in the flower. Pollen is crucial to plant reproduction because it is the sperm cells of the plant. Pollen grains are very small and require magnification to view but in large numbers form a ruff powder.

The formation of pollen grains is a combination of meiosis and mitosis. After two stages of meiosis a triad of haploid pollen grain cells is formed which later separate into singular pollen grain cells.