A bisexual flower with two whorls of perianth is incomplete,complete,zygomorphic,actinomorphic
Answers
Answer:
Explanation:
flower is the major part of a flowering plant which plays an important role in the process of reproduction. For the process of reproduction, the internodes and leaves of the stem get modified to form different parts of a flower.
A typical flower has four major whorls or parts called the calyx, corolla, androecium and gynoecium. Other than these major whorls, the flower has a pedicel and the receptacle.
Structure of a typical flower
These are the different parts of a flower.
i. Calyx: It is the outermost whorl of the flower. It is made up of individual units called the sepals. When the flower is in the bud stage, the sepals serve as a protection by enclosing all the other parts. Further, they also perform the process of photosynthesis. The sepals may be in a fused form such as, in the Hibiscus flower or may be free similar to a mustard flower.
ii. Corolla: It is the second whorl which is present inner to the calyx. The individual units of the corolla are called petals. The petals are usually bright and colourful and are attractive and some are green in colour. The colourful petals attract the insects for pollination. They also serve as a protection for the inner whorls.
The petals may be fused together like in the flowers of cucumber or they may be individual units like those of the Hibiscus.
iii. Androecium: It is the third whorl of the flower. It is the male reproductive part of the flower. The individual units are called stamens or microsporophylls. Every stamen in a typical flower has three components:
(a) anther
(b) filament
(c) connective
The anther is the fertile unit of the stamen. It is a bilobed structure which produces the pollen grains or the microspores.
The anther is attached to the flower through the filament. It is the sterile component of the androecium. Anthers may be attached to filament at different locations depending on the type of flower.
The filament is extended in between the lobes of anther and is called connective as it connects the anther and the filament.
iv. Gynoecium: It is the fourth and the innermost whorl of the flower. It is the female reproductive part of the flower. Gynoecium is also called pistil. Pistil is made up of three parts:
(a) stigma
(b) style
(c) ovary
Stigma is the tip of a pistil. This is the part of the pistil that receives the pollen.
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.
Ovary is the part which bears the ovules or the megaspores. It is the swollen lowermost part of the gynoecium.
v. Pedicel: It is the stalk of a flower, through which the flower is attached to the plant stem.
vi. Receptacle or thalamus: It is the swollen portion of a flower just above the stalk. All the whorls of a flower are attached to the thalamus.