Describe the various types of placentati | Class 11 Biology Chapter Morphology of Flowering Plants, Morphology of Flowering Plants NCERT Solutions

Question: Describe the various types of placentations found in flowering plants.
Answer:

Placentation refers to the arrangement of ovules inside the ovary. It is of five basic types.

(A) Marginal placentation

The ovary in which the placenta forms a ridge along the ventral suture of the ovary and the ovules develop on two separate rows is known to have marginal placentation. This type of placentation is found in peas.

Marginal placentation

(B) Parietal placentation

When the ovules develop on the inner walls of the ovary, the ovary is said to have parietal placentation.

Parietal placentation

C) Axile placentation

In axile placentation, the placenta is axial and ovules are attached to it. Examples include China rose, lemon, and tomato.

Axile placentation

(D) Basal placentation

The ovary in which the placenta develops from its base and a single ovule is found attached to the base is said to have basal placentation. It is found in marigold and sunflower.

Basal placentation

(E) Free central placentation

In free central placentation, the ovules develop on the central axis while the septa are absent. This type of placentation is found inDianthus and primrose.

Free central placentation


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Comments

  • Afreen Taj R G
  • 2018-12-01 16:27:31

Thank you for this information

  • bright
  • 2018-11-12 22:19:47

pls example are what

  • Bindu
  • 2018-11-09 05:45:22

This was very helpful and thank u

  • Rudra Oberoi
  • 2017-05-19 12:23:57

also give defination of Superficial placentation

  • Hasam uddin
  • 2017-03-05 07:43:34

Write about its evolution ...,... Its to good that u make the s.media beneficial For students.. Any chance for me to be the editor here

  • purvaja hatwalne
  • 2016-12-20 22:06:21

agremone comes under superficial or laminar placentation in which ovules are attached to the sides of locules or chamber

  • Harsewak
  • 2016-09-28 21:48:26

Under which catgry the argemone comes??

  • Jeysurya
  • 2016-08-29 19:27:23

Under which category does strawberry and custardapple comes??

  • vijay
  • 2016-08-18 23:13:45

Hi Esther, As you asked, SUPERFICIAL PLACENTATION also falls under this category.

  • vijay
  • 2016-08-18 23:10:29

Hi Abel kandwara oino, Yes you are right apical placentation also fall under this categories.

Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 10: Describe the various types of placentations found in flowering plants.....

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