Question

What are the types of ovules in the basis on integuments.​

Answer 1

On the basis of integuments ovules are divided into three types :

(1) Unitegmic: A single integumented ovule is called unitegmic ovule.

Example: members of Gamopetalae and mostly gymnosperms.

(2) Bitegmic: Two integumented ovule is called bitegmic ovule.

Example - In most of Angiosperms

(3) Ategmic: The ovule in which integuments are absent is called ategmic ovule .

Examples: Loranthus, Olax, Liriosma, & Santalum.

Answer 2

Answer:

Ovules are classified in three categories on the basis of number of integuments: Unitegmic: When there is single integument in the ovule, then it is known as unitegmic. e.g. Gymnosperms. Bitegmic: When there are two integuments in the ovule, then it is known as bitegmic.

There are six types of ovules:

Orthotropous or atropous ovule. (ortho-straight, tropous - turn)

Anatropous ovule. (ana - backward or up, tropous - turn)

Hemi-anatropous or hemitropous ovule.

Campylotropous ovule.

Amphitropous ovule.

Circinotropous ovule.