Question

In $82\%$ of angiosperm families, ovule is

• A.
  Anatropous
• B.
  Circinotropous
• C.
  Amphitropous
• D.
  Orthotropous

Answer 1

The correct option is A

Anatropous
Anatropous ovule
Anatropous ovule is inverted and the micropyle lies close to the hilum, facing the placenta. The micropyle and chalaza lie in a vertical line. Anatropous type of ovule is found in 82% of angiosperms.

Orthotropous ovule
An orthotropous ovule lies straight in the ovary and has a straight funicle which is in the same line with the micropyle and chalaza.

Amphitropous ovule
In an amphitropous ovule, the body of the ovule and the embryo sac are curved so that the hilum, chalaza and micropyle lie in close proximity. The embryo sac forms a horseshoe shape.

Circinotropous ovule
A circinotropous ovule is straight with the micropyle facing upwards. The funcile is long, coiled and completely encircles the ovule.