Ncert Exercises & Solutions

29. How can you differentiate between free central and axile placentation?

Placentation is the arrangement of ovules on the walls of ovary with the help of special kind of tissue called placenta. Plants show different types of placentation, central and axile are among them.

They have the following differences

Free Central Placentation

Axile Placentation

Ovary contains only one chambers the placenta bearing.

The ovules are borne on the central axis and less free inside the ovary. The septa are absent.

e.g., Dianthus, Silensa, etc,

Ovary is syncarpous and multi-carpellary, i.e., contain many chambers.

Placenta arise from the central axis where the septa fuse to form axile column to which ovules are attached.

e.g., Citrus, tomato etc.

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