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Hint: The essential parts of a flower can be considered in two parts - the vegetative part, consisting of petals and associated structures in the perianth, and the reproductive or sexual parts.
Complete answer:A stereotypical flower consists of four kinds of structures attached to the tip of a short stalk. Each of these kinds of parts is arranged in a whorl on the receptacle.
The four main whorls are as follows: Calyx, Corolla, Androecium, and Gynoecium.
The calyx and corolla form the perianth.
The calyx is the outermost whorl consisting of units called sepals. These are typically green and enclose the rest of the flower in the bud stage.
Corolla is the next whorl toward the apex, composed of units called petals, which are typically thin, soft, and colored to attract animals that help the process of pollination.
The reproductive part forms the androecium and gynoecium.
Additional information: Androecium is the whorl (sometimes multiplied into several whorls), consisting of units called stamens.
1. Stamens consist of two parts: a stalk called a filament, topped by an anther where pollen is produced by meiosis, and eventually dispersed.
2. The gynoecium is the innermost whorl of a flower, consisting of one or more units called carpels.
3. The carpel or multiple fused carpels form a hollow structure called an ovary, which produces ovules internally.
4. Ovules are megasporangia and they in turn produce megaspores by meiosis which develop into female gametophytes. These give rise to egg cells.
5. A pistil may consist of a single carpel or a number of carpels fused together.
6. The sticky tip of the pistil, the stigma, is the receptor of pollen. The supportive stalk, the style, becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma.
So, the correct answer is B. petals.
Note: A bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale.
Tepals are one of the divisions of a flower perianth, especially one that is not clearly differentiated into petals and sepals.
Complete answer:A stereotypical flower consists of four kinds of structures attached to the tip of a short stalk. Each of these kinds of parts is arranged in a whorl on the receptacle.
The four main whorls are as follows: Calyx, Corolla, Androecium, and Gynoecium.
The calyx and corolla form the perianth.
The calyx is the outermost whorl consisting of units called sepals. These are typically green and enclose the rest of the flower in the bud stage.
Corolla is the next whorl toward the apex, composed of units called petals, which are typically thin, soft, and colored to attract animals that help the process of pollination.
The reproductive part forms the androecium and gynoecium.
Additional information: Androecium is the whorl (sometimes multiplied into several whorls), consisting of units called stamens.
1. Stamens consist of two parts: a stalk called a filament, topped by an anther where pollen is produced by meiosis, and eventually dispersed.
2. The gynoecium is the innermost whorl of a flower, consisting of one or more units called carpels.
3. The carpel or multiple fused carpels form a hollow structure called an ovary, which produces ovules internally.
4. Ovules are megasporangia and they in turn produce megaspores by meiosis which develop into female gametophytes. These give rise to egg cells.
5. A pistil may consist of a single carpel or a number of carpels fused together.
6. The sticky tip of the pistil, the stigma, is the receptor of pollen. The supportive stalk, the style, becomes the pathway for pollen tubes to grow from pollen grains adhering to the stigma.
So, the correct answer is B. petals.
Note: A bract is a modified or specialized leaf, especially one associated with a reproductive structure such as a flower, inflorescence axis, or cone scale.
Tepals are one of the divisions of a flower perianth, especially one that is not clearly differentiated into petals and sepals.
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