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- Biology
Food is a basic requirement for all living organism Major component our food carbohydrates, protein,fat
- Biology
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About New trick
irregular)
cannot be divided into two similar halves by any vertical
plane passing through the centre
Canna.
Hypogynous the gynoecium occupiesthe highest position
while the other parts are situated below it
ovary
superior
mustard, china rose
and brinjal
Perigynous
gynoecium is situated in the centre and other
parts of the flower are located on the rim of
the thalamus almost at the same level
ovary half
inferior
plum, rose, peach
Epigynous
the margin of thalamus grows upward
enclosing the ovary completely and getting
fused with it, the other parts of flower arise
above the ovary
ovary
inferior
guava and cucumber,
and the ray florets of
sunflower.
5.5.1 Parts of a Flower
• Aestivation:
The mode of arrangement of sepals or petals in floral bud with respect to
the other members of the same whorl is known as aestivation.
Valvate
when sepals or petals in a whorl just touch one another
at the margin, without overlapping
Calotropis
Twisted
If one margin of the appendage overlaps that of the next
one and so on
china rose, lady’s
finger and cotton
Imbricate
If the margins of sepals or petals overlap one another but
not in any particular direction
Cassia and
gulmohur
Vexillary or
papilionaceous
there are five petals, the largest (standard) overlaps the
two lateral petals (wings) which in turn overlap the two
smallest anterior petals (keel)
In pea and bean
flowers
• Androecium
Epipetalous
stamens are attached to the petals
brinjal
Epiphyllous
stamens are attached to the perianth
flowers of lily
Polyandrous
Free stamens
Monoadelphous united into one bunch or one bundle
china rose
Diadelphous
united into two bundles
pea
Polyadelphous
united into more than two bundles
citrus
variation in the length of filame
See more
About the lesson
- All Levels
- English
All languages in which the lesson is available :
English
irregular)
cannot be divided into two similar halves by any vertical
plane passing through the centre
Canna.
Hypogynous the gynoecium occupiesthe highest position
while the other parts are situated below it
ovary
superior
mustard, china rose
and brinjal
Perigynous
gynoecium is situated in the centre and other
parts of the flower are located on the rim of
the thalamus almost at the same level
ovary half
inferior
plum, rose, peach
Epigynous
the margin of thalamus grows upward
enclosing the ovary completely and getting
fused with it, the other parts of flower arise
above the ovary
ovary
inferior
guava and cucumber,
and the ray florets of
sunflower.
5.5.1 Parts of a Flower
• Aestivation:
The mode of arrangement of sepals or petals in floral bud with respect to
the other members of the same whorl is known as aestivation.
Valvate
when sepals or petals in a whorl just touch one another
at the margin, without overlapping
Calotropis
Twisted
If one margin of the appendage overlaps that of the next
one and so on
china rose, lady’s
finger and cotton
Imbricate
If the margins of sepals or petals overlap one another but
not in any particular direction
Cassia and
gulmohur
Vexillary or
papilionaceous
there are five petals, the largest (standard) overlaps the
two lateral petals (wings) which in turn overlap the two
smallest anterior petals (keel)
In pea and bean
flowers
• Androecium
Epipetalous
stamens are attached to the petals
brinjal
Epiphyllous
stamens are attached to the perianth
flowers of lily
Polyandrous
Free stamens
Monoadelphous united into one bunch or one bundle
china rose
Diadelphous
united into two bundles
pea
Polyadelphous
united into more than two bundles
citrus
variation in the length of filame
See more
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