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sagar.arora1 from SANATAN DHARAM VIDYA MANDIR , asked a question
Subject: , asked on 19/11/10

 define different types of placentation in plants?

EXPERT ANSWER

Meetu Misra ,Meritnation Expert added an answer
Answered on 20/11/10

Dear Student,

The different types of placentation found in plants are

  • Marginal placentation: The placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on the ridge. Example: Peas
  • Axile placentation: The placenta is axial and the ovules are attached to the multilocular ovary. Example: China rose, lemon and orange. 
  • Parietal placentation: In this type of placentation, the ovules develop on the inner wall of the ovary. Ovary has a single chamber but appears to be double-chambered because of the formation of a false septum. Example: Mustard and argemone.
  • Free central placentation: The ovules are borne on the central axis. The septum is absent in this type of placentation. Example: Dianthus and primrose.
  • Basal placentation: In this type of placentation, the placenta is situated at the base of the ovary and a single ovule is attached to it. Example: Sunflower.

Hope this answers your question.

Cheers!!!

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arunblc... , added an answer
Answered on 17/10/11

thank you mdm.

Q. Classify the fruit crops based on the edible parts ?. with figure explain?.

elink.bikram... , added an answer
Answered on 20/10/11

what is the superficial placentation in plants?

v.s.k.e.m.b... , added an answer
Answered on 12/11/11

another placenta is also found its apical placentation where the placenta is found at the top