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The arrangements of ovules within the ovary is known as placentation. What does the term placenta refer to ? Name and draw various types of placentations in the flower as seen in $T.S$. or $V.S$.
Solution

$\rightarrow$ Placenta : Placenta is a flat cushion like tissue, one or more ovules are attached on it. Various types of placentation seen in flower is shown below.
$\rightarrow$ Ovary bears one or more ovules attached to a flattened cushion like placenta.
$\rightarrow$ The arrangement of ovules within the ovary is called placentation.
$\rightarrow$The types of placentation are as follow:
$(i)$ Marginal Placentation : In marginal placentation the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows e.g. pea, bean.
$(ii)$ Axile Placentation : When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is said to be axile. e.g. china rose, tomato and lemon.
$(iii)$ Parietal Placentation : In parietal placentation, the ovules develop on the inner wall of the ovary or on peripheral part. Ovary is one-chambered but it becomes two chambered due to the formation of the false septum, e.g., Mustard and Argemone.
$(iv)$ Free Central Placentation : When the ovules are borne on central axis and septa are absent ovary is one-chambered so it is called free central e.g. Dianthus and Primrose.
$(v)$ Basal Placentation : In basal placentation, the placenta develops at the base of ovary and a single ovule is attached to it, e.g. Sunflower, Wheat.
Similar Questions
Match the placental types (Column$-I$) with their examples (Column$-II$)
Column$-I$ | Column$-II$ |
$(a)$ Basal | $(i)$ Mustard |
$(b)$ Axile | $(ii)$ China rose |
$(c)$ Parietal | $(iii)$ Dianthus |
$(d)$ Free central | $(iv)$ Sunflower |
Choose the correct answer from the following options