STATION 2: FLOWERING PLANTS a. What are FLOWERING PLANTS? (Provide a basic defin
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STATION 2: FLOWERING PLANTS a. What are FLOWERING PLANTS? (Provide a basic definition for the angiosperms) b. FORM AND FUNCTION OF FLOWERS: Examine, draw/diagram, label and describe the characteristics of at least ONE flower variety,. Be sure to clearly label and describe the functions of the: sepals, petals, stigma, style, anthers, stamen, ovary, etc. Carefully dissect the flower to expose the ovary and ovules. Diagram and label/describe all of the parts you see. Describe and diagram any of the flowers' traits or characteristics (color, structure, aroma, nectar, etc.) that attract or accommodate pollinators or bring the pollinators into contact with the male and female parts of the flowers. "Use the backside if you need extra space.Explanation / Answer
2) Flower is a modified shoot, may be pedicilate (with stalk called pedicel) or sessile (without stalk). The tip of pedicel swells up to form a cone structure termed as thalamus or receptacle or tours. In a flower, four types of structures called floral leaves are arranged in four whorls, which are divided into two groups -
Calyx is the outer most whorl and a collection of sepals. It is generally green and leaf like and protects flower bud. Corolla is a collection of petals. The petals are large, brightly colored and mostly have fragnance and help in pollination by attracting insects. Flowers of monocotyledons have three sepals and three petals and dicotyledons have four or five of each.
Androceium is a collection of stamens (microsporophyll). A stamen has - the filament and the anther. Anther is a bilobed structure present at the tip of the filament, bearing four pollen sacs filled with tiny grains called as pollen or pollen grains.
Gynoecium or pistil is a collection of carpels. A sterile gynoecium is termed as pistillode. Each carpel has three parts -
On number of carpel, gynoecium may ne monocarpellary and compound.
Pollination in angiosperms is indirect in that pollen is deposited on the stigma of the carpel rather than directly on the ovule as in gymnosperm.
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