What is called Aestivation ? Describe its types.
What is called Aestivation ? Describe its types.
$\rightarrow$ 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.
$\rightarrow$ Its types are as follow:
$(i)$ Valvate : When sepals or petals in a whorl just touch one another at the margin, without overlapping, is said to be valvate for e.g. Calotropis.
$(ii)$ Twisted : If one margin of the appendage overlaps that of the next one and so on it is. called twisted. e.g. China rose, Lady's finger, Cotton.
$(iii)$ Imbricate : If the margins of sepals or petals overlap one another but not in any other direction the aestivation is called imbricate for e.g. Cassia and Gulmohur.
$(iv)$ Vexillary or Papilionaceous : In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals this type of aestivation is called papilionaceous.
Similar Questions
Read the following statements.
$(i)$ 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.
$(ii)$ Ovary is half-inferior.
$(iii)$ Examples are plum, rose and peach.
Which condition of flowers is being described by the above statements?
Read the following statements.
$(i)$ 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.
$(ii)$ Ovary is half-inferior.
$(iii)$ Examples are plum, rose and peach.
Which condition of flowers is being described by the above statements?
- [AIIMS 2014]
Vexillum, alea and keel are
Vexillum, alea and keel are
Accessory whorl of flower which attract insects for pollination.
Accessory whorl of flower which attract insects for pollination.
Choose incorrect pair
(Aestivation - example).
Choose incorrect pair
(Aestivation - example).
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason $R$: Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves.
In the light of the above statements, choose the correct answer from the options given below :
Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A$: A flower is defined as modified shoot wherein the shoot apical meristem changes to floral meristem.
Reason $R$: Internode of the shoot gets condensed to produce different floral appendages laterally at successive node instead of leaves.
In the light of the above statements, choose the correct answer from the options given below :
- [NEET 2023]