Question

Angiospermic ovule is 

a) Ategmic

b) Monotegmic

c) Bitegmic

d) Polytegmic

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Answer 1

Biology

Sexual Reproduction in Flowering Plants

Post-fertilisation: Structures and Events

The most common type of ovu...

BIOLOGY

The most common type of ovule in angiosperm is

MEDIUM

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ANSWER

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.

Answer 2

Angiospermic ovule is c) Bitegmic

• Angiosperms refers to the flowering plants.
• Ovule is a structure in gynoecium that develops into seed, after fertilization.
• The structure is divided into three parts namely nucellus, integuments and gametophyte.
• Integument is the outer layer and acts as protective covering of the ovule.
• Angiosperms have two integuments while gymnosperms have one.
• Integuments form the seed coat of seed, which is formed after fertilization.