Operculum - seed appendages, Biology

Assignment Help:

Operculum - Seed Appendages

The term operculum is applied to a plug-like structure formed in the micropylar portion of the seed by proliferation of cells at the tip of the inner integument or the nucellus. An operculum has been observed in seeds of many monocotyledonous families, such as the Commelinaceae, Musaceae, Lemnaceae and Zingiberaceae, and a few dicotyledonous families like Bignoniaceae and Nymphaeaceae.

In Lemna paucicostata, cells at the tip of the inner integument undergo a remarkable expansion after fertilization and form a dome-shaped, stopper- like operculum. Cells of the operculum are thick-walled and contain an orange-red substance. During germination of the embryo the operculum becomes detached from rest of the seed and facilitates emergence of the embryo.


Related Discussions:- Operculum - seed appendages

What is trna structure , Transfer  RNA  (tRNA)  molecules  play  an  very s...

Transfer  RNA  (tRNA)  molecules  play  an  very significant  role  in  protein  synthesis. Each tRNA becomes covalently bonded to a particular amino acid  to  create  aminoacyl- t

Endomyocardial biopsy, Endomyocardial biopsy helps in understanding that ca...

Endomyocardial biopsy helps in understanding that carditis can cause CCF in patients with rheumatic heart disease but frequency of diagnostic features on EMB is found only in 17 pe

What does vacuoles do, What does vacuoles do? It is an organelle, locat...

What does vacuoles do? It is an organelle, located in the cell's cytoplasm, which is the site of protein synthesis. It is really a protein having of 2 parts. These 2 "parts"

Goal of bcc programme, The overall goal of BCC programs for diabetes mellit...

The overall goal of BCC programs for diabetes mellitus is to promote behaviors that control diabetes mellitus and prevent complications. These include: Following treatment

What is the secondary structure of a protein, What is the secondary structu...

What is the secondary structure of a protein? The secondary protein structure is formed by the manner its amino acids interact by the intermolecular bond. These interactions ma

Determine improper fit at the abutment - implant interface, Improper fit at...

Improper fit at the abutment/- implant interface It is very vital that the fit of the abutment is crosschecked radiographically prior to final delivery of the prosthesis. The m

Explain the types of double beam systems, Explain the types of double beam ...

Explain the types of double beam systems? Following are types of double beam systems: a) Dual beam in space type b) Dual beam in time type In type (a) separate detecto

Coelom, Why Chordates are Schizocoelic, while other deuterostomes are enter...

Why Chordates are Schizocoelic, while other deuterostomes are enterocoelic?

Access cavity perforation - types of root perforation, Access Cavity Perfor...

Access Cavity Perforation - Types of Root Perforation Can occur during access cavity perforation (specially in anterior) Due to misdirection of bur during access cavit

Disease prevention for the high risk group, Disease Prevention for the High...

Disease Prevention for the High Risk Group   Interventions aimed at early diagnosis and appropriate management for reducing morbidity and mortality targeting people who suffer

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd