State the location and function of the following parts in a flower. 1.Placenta,2.Anther,3.Thalamus,4.Stigma,5.Ovules,6.Androecium,7.Gynoecium.pls answer it as fast as you can
Answers
Answer:
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Explanation:
a. Androecium:
(i) It is the third whorl of the flower.
(ii) It is the male reproductive part of the flower. The individual units are called stamens or the microsporophylls. Every stamen in a typical flower has three components – the anther, the filament and the connective.
(iii) The anther is the fertile unit of the stamen. It is a bilobed structure which produces the pollen grains or the microspores.
(iv) The anther is attached to the flower through the filament. It is the sterile component of the androecium.
b. Gynoecium:
(i) It is the fourth and the innermost whorl of the flower.
(ii) It is the female reproductive part of the flower. The gynoecium is also called the pistil. The pistil is made up of three parts, the stigma, style and the ovary.
(iii) The stigma is the tip of the pistil. It is the pollen receiving part of the pistil.
The style is the elongated, thin, tube-like structure which is continuous to the stigma. The style is attached to the stigma and the ovary on either ends.
(iv) Ovary is the part which bears the ovules or the megaspores. It is the swollen lowermost part of the gynoecium.
c. Calyx:
(i) It is the outermost whorl of the flower.
(ii) It is made up of individual units called sepals. When the flower is in bud stage, the sepals serve as protection by enclosing all the other parts.
(iii) Sepals also undertake the process of photosynthesis.
(iv) The sepals may be in fused form like in hibiscus flower or may be free like in mustard flower.
d. Corolla:
(i) It is the second whorl which is present inner to the whorl of calyx.
(ii) The individual units are called petals. The petals are usually bright and colourful and are attractive while a few may be green in colour.
(iii) The colourful petals attract the insects for pollination. They also serve as a protection for
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