Answer :

Each ovary bears one or more ovules attached to a flattened, cushion-like structure called placenta.


The arrangement of ovules within the ovary is known as placentation. There are various types of placentations, namely:


a) Marginal - 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. Example - pea.


marginal.png


b) Axile - When the placenta is axial and the ovules are attached to it in a multilocular ovary, the placentaion is said to be axile. Examples - china rose, tomato and lemon.


axile.png


c) Parletal - 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.


parietal.png


d) Free – Central - When the ovules are borne on central axis and septa are absent, the placentation is called free central. Examples - Dianthus and Primrose



e) Basal - In basal placentation, the placenta develops at thebase of ovary and a single ovule is attached to it. Examples - sunflower, marigold.


basal.png


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

The arrangement oBiology - Exemplar

Sunflower is not Biology - Exemplar

The arrangements Biology - Exemplar

Differentiate betBiology - Exemplar

The mode of arranBiology - Exemplar

How can you diffeBiology - Exemplar

A typical angiospBiology - Exemplar

Add the missing fBiology - Exemplar

In epigynous flowBiology - Exemplar