Difference Between Integument and Testa

Integument in the exterior or the outermost covering of an ovule. Tesla on the other hand is the exterior or outermost seed covering. When sexual reproduction takes place, male gametes are carried by the pollen, the female gamete is the ovule. Both the gametes fuse forming a zygote(diploid). Ovary carries the ovule, which inturn is protected by the covering known as integuments. Seeds are developed from the ovule once fertilization occurs while integument develops into the seed coat referred to as testa.

Integument

  • Outermost protective covering of the ovule
  • Angiosperms have two integuments while gymnosperms have one integument layer
  • It comprises living cells and is smooth and thin
  • Does not possess sclereids
  • Nucleus found at the micropyle opening to promote entrance of pollens into ovule for syngamy
  • It is a pre fertilization structure hence develops into testa once fertilization takes place

Testa

  • Exterior protective covering of the seed
  • Outer integuments emerges into testa and is brown in appearance
  • It is a post-fertilization structure
  • Two layers of testa – exotesta and endotesta, chiefly safeguarding the embryo that is developing
  • Also protects the seed while the seed disperses
  • It consists of sclereids as it is hard and thick
  • As it is impermeable to water it results in seed dormancy at times

6.

Integument-It is pre -fertilized structure.

Testa – It is a post fertilized structure.

Read more on Brainly.in – https://brainly.in/question/6031662#readmore

Difference Between Integument and Testa

Following are some of the important differences between Integument and Testa.

Attributes

Integument

Testa

Outermost protective covering

Of ovule

Of seed

Nature of cells

Living.

Thin and smooth

Non-living

Thick and hard

Fertilization stage

Pre-fertilization structure

Post-fertilization structure

Number of layers

One or two

Single layered

Sclereids

Absent

Present

Seed dormancy

No role

Impermeable to water hence plays key in seed dormancy

Origination

Arise from chalazal ending of ovule

From outer integument of ovule once fertilization takes place

Function

To protect the ovule

To protect the developing embryo

Permeability

Permeable to water

Impermeable

Those were some differences between integument and testa. Watch this space at BYJU’S for more such differences for NEET.

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