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Chapter: 12th Botany : Practicals

Types of ovules

Aim: To recognize different types of ovules in flowering plants

Models / Photographs / Pictures

Exercise: Types of ovules

Aim: To recognize different types of ovules in flowering plants

Principle: To identify ovules based on the orientation, form and position of the micropyle with respect to funicle and chalaza

Requirements: Models / Photographs/ Pictures of different types of ovules.

 

A. Anatropous Ovule

Diagnostic Features

·        The body of the ovule becomes completely inverted so that micropyle lies close to the funicle.

·        Micropyle and chalaza lie on the same straight line. Example: Asteraceae.


 

B. Orthotropous Ovule

Diagnostic Features

·        In this type of ovule, the micropyle is at the distal end.

·        The ovule is erect or straight so that the funicle, chalaza and micropyle lie on the same vertical line. Example: Piperaceae and Polygonaceae.


 

C. Campylotropous Ovule

Diagnostic Features

·        In this type, the body of the ovule at the micropylar end is curved and more or less bean shaped.

·        The embryosac is slightly curved.

·        The funicle, micropyle and chalaza are adjacent to one another with the micropyle oriented towards the placenta. Example: Leguminosae.


 

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