Question

The most common type of ovule in Angiosperms is ____.

• A. Anatropous
• B. Amphitropus
• C. Antropous
• D. Circinotropous

Answer 1

Answer: (A)

There are six types of ovules which are formed in angiosperms and the most common type is anatropous ovule.

1. Anatropous ovule - In this type, the body of the ovule becomes completely inverted during the development such that micropyle lies very close to the funicle. For example, gamopetalae members.

2. Orthotropous ovule - The body of ovule is erect and straight such that hilum, chalaza and micropyle lie in straight line. For example, Polygonum.

3. Hemitropous ovule- The body of ovule is placed transversely at right angles to the funicle. The micropyle and chalaza lie in one straight line. For example, Ranunculus.

4. Campylotropous ovule- The body of ovule is curved and bent round so that the micropyle and chalaza do not lie in the same straight line. For example, leguminosae.

5. Amphitropous ovule- The curvature of the ovule is very much pronounced and the embryo sac also becomes curved. For example, Butomaceae.

6. Circinotropous ovule- The nucellus and axis are in the same straight line in the beginning but due to rapid growth on one side the ovule becomes anatropous. For example, Opuntia.

Thus, the correct answer is option A.