Flower and symmetry of flower
Parts of flower
1 Calyx2 Corolla
3 Stamen
4 Carpel
The highly specialized shoot which is responsible for the production of fruits and seeds is called flower.Flower is concerned with the sexual reproduction.Mostly flower have four series of floral leaves.They form four whorls. In some cases floral leaves are arranged in more than one whorl. Therefore they have more than 4 whorl.It is arranged in twos.threes, fours or fives in each whorl.Thus flower is called dimerous teramerous and pentaamerous. Some flower have more than ten floral leaves in each whorl.These flower are also identify.
Flower is known as modified shoot. Flower is arise on the axil of leaf like shoot. Flower is central axis like vegetative shoot. Thalamus has very short internodes. Floral leaves is covered by it.On thalamus some flower like passion flower with elongated inter node are arranged.
The internal structure of thalamus is resemble with internal structure of stem The floral leaves is show cyclic or whorled phyllotaxis like ordinary leaves. Arrangement of the floral leaves is flower bud. Which similar to the arrangement of floral leaves in leaf bud. Stamens are petal like in some flower.Like rose and canna. The carpal are regarded as leaves This has become folded along its margin to from closed structures.
Flower as modified shoot
It is consider that flower is modified shoot. Flower is supported many facts.These are given
Flower is arises in the axil of leaf,bract like vegetative shoot.Thalamus has very short internode. Floral leaves are crowed on it. The thalamus of some flower like passion flower has elongated upward and bears other foliage leaves.So it behaves as ordinary shoot.
The internal structure of thalamus resemble the internal structure of stem.They have internal anatomy. Floral leaves show cyclic or whorled phyllotaxis like ordinary leaves.
The forms and structure of sepal and petal is resample with the foliage leaves.The sepal are mostly green in cloure which resample with leaves.In some cases petal are also green it called seples . Carpal is regarded as leaves.This leaves is become folded along its margin and form closed structure.
Symmetry of flower if flower has capacity to divide into to equal halves in one or more tan one plane it called symmetry of flower. Flower has three type on the basis of their symmetry.These are
Actinomorphic or regular flower is cut into two equal halves by more than one plane.Example poppy.
Zygomorphic If flower can be cut in to two equal halves by only one plane it is called zygomorphic. Example Ocimum.
It is consider that flower is modified shoot. Flower is supported many facts.These are given
Flower is arises in the axil of leaf,bract like vegetative shoot.Thalamus has very short internode. Floral leaves are crowed on it. The thalamus of some flower like passion flower has elongated upward and bears other foliage leaves.So it behaves as ordinary shoot.
The internal structure of thalamus resemble the internal structure of stem.They have internal anatomy. Floral leaves show cyclic or whorled phyllotaxis like ordinary leaves.
The forms and structure of sepal and petal is resample with the foliage leaves.The sepal are mostly green in cloure which resample with leaves.In some cases petal are also green it called seples . Carpal is regarded as leaves.This leaves is become folded along its margin and form closed structure.
Symmetry of flower if flower has capacity to divide into to equal halves in one or more tan one plane it called symmetry of flower. Flower has three type on the basis of their symmetry.These are
Zygomorphic If flower can be cut in to two equal halves by only one plane it is called zygomorphic. Example Ocimum.
Asymmetrical Flower which can be cut not into two equal halves in any of the plane.Example is opuntia Zygomorphic and asymmetric flower called irregular.
Thalamus
The terminal swollen part of the flower which bears sepals, petals,stamens and carpels is called thalamus.It is very short in most flower.But sometime it become long. Inter node between calyx and corolla is called anthophore. The internode between corolla androcium is called androphore. The internode between androecium and gynocium is known as gynophore.
Thalamus has different forms. In some cases thalamus is convex or conical.The gynocium develops on the top of thalamus.But stamens and petal and sepal are bore on the side of gynocium. Ovary is superior but all other parts are inferior. Like Brasssica, poppy. This condition is known as Hypogynous. But in other cases thalamus is falttend or disc like.The gynocium is present in the center of disc. Carpel is develop on the bottom of the cup. Example is Spiraea. Epigynous In this condition overy is surrounds by thalamus overy. Gynocium is inferior but all other parts are superior.Its example is apple,peer etc.
Thalamus
The terminal swollen part of the flower which bears sepals, petals,stamens and carpels is called thalamus.It is very short in most flower.But sometime it become long. Inter node between calyx and corolla is called anthophore. The internode between corolla androcium is called androphore. The internode between androecium and gynocium is known as gynophore.
Thalamus has different forms. In some cases thalamus is convex or conical.The gynocium develops on the top of thalamus.But stamens and petal and sepal are bore on the side of gynocium. Ovary is superior but all other parts are inferior. Like Brasssica, poppy. This condition is known as Hypogynous. But in other cases thalamus is falttend or disc like.The gynocium is present in the center of disc. Carpel is develop on the bottom of the cup. Example is Spiraea. Epigynous In this condition overy is surrounds by thalamus overy. Gynocium is inferior but all other parts are superior.Its example is apple,peer etc.
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