Ovule is inverted with body fused to funicle, micropyle lying close to hilum and facing the placenta. It is

Options

A. Hemitropous
B. Orthotropous
C. Anatropous
D. Campylotropous

Answer

C

Explanation

Ovules are of 6 types:
1. Orthotropous (Atropous) ovule
• Orthotropous ovule is the most primitive type ovule.
• Ovule is straight and Micropyle, chalaza and funicle lies in a straight line or present at `180^(@)` or in one verti cal plant.
e.g.: Most of gymnosperms like Cycas and primitive angiosperms like Nelumbo and Polygonum.
2. Anatropous ovule Anatropous ovule is the most common (82% angio sperms) and most advanced type of ovule.
Ovule is inverted.
• Micropyle and chalaza lies in a straight line.
• Micropyle and funicle lies close to each other.
e.g.: Asteraceae (most advance dicot family) and Solanaceae.
3. Hemitropous (half-inverted) ovule
• Micropule and chalaza lies in a straight line but both lies at `90^(@)` or perpendicular to funicle.
e.g.: Primulaceae and Rannunculaceae.
4. Campylotropous (body curved) ovule
• Body of ovule is curved.
• Embryo sac less curved and appears kidney shaped.
e.g.: Capsella and Pea.
5. Amphitropous ovule
• Both ovule and embryo sac curved and appears horse shape shaped.
e.g.: Papaveraceae, Alisma 6. Circinotropous ovule
• Funicle coiled around the ovule.
e.g.: Opuntia.


Six different types of ovules in angiosperms
(a) Orthotropous, (b) Anatropous, (c) Hernitropous
(d) Campylotropous, (e) Amphitropous, (f) Circinotropous