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Plant Structures

Problems

Flowers

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Problem : Name the four whorls of the angiosperm flower. What structures comprise each whorl?

The calyx contains the sepals, the corolla contains the petals, the androecium contains the stamens, and the gynoecium contains the pistils (or carpels).

Problem : What is the function of the ovary? Where is it, and from what structure is it formed?

The ovary encloses the ovules (which contain egg cells, and later become seeds). After fertilization occurs, the ovary develops into a fruit and protects the embryo contained inside. The ovary is composed of modified leaves called carpels and is found at the base of the pistil on the flower.

Problem : Sketch the parts of the typical flower, including the structures in all four whorls.

Figure %: The Parts of the Flower

Problem : What is the location, function, and structure of the gynoecium?

The gynoecium lies in the very middle of the flower and contains the female reproductive organs, the pistils. The top of each pistil (there may be one or more), where pollen grains land, is called the stigma and the shaft leading down into the ovary is called the style. The ovary, containing ovules and egg cells, makes up the very bottom of the pistil.

Problem : What is the nonreproductive portion of the flower called, and what is it comprised of?

The nonreproductive portion of flower is called the perianth and is made up of the corolla (petals) and calyx (sepals).

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