Operculum - seed appendages, Biology

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.

Posted Date: 1/23/2013 8:08:37 AM | Location : United States







Related Discussions:- Operculum - seed appendages, Assignment Help, Ask Question on Operculum - seed appendages, Get Answer, Expert's Help, Operculum - seed appendages Discussions

Write discussion on Operculum - seed appendages
Your posts are moderated
Related Questions
Pound cake test In some cases, oil or margarine creaming volume is most accuratelymeasured by preparing a regular pound cake, omitting the chemical leavener andmeasuring the vo

1. Andalusian chickens may be either black, white, or gray. The gene for black is not dominant over the gene for white, nor is the gene for white dominant over the gene for black.


Cellular respiration is the transfer of energy from various molecules to produce ATP; takes place in the mitochondria of the eukaryotes, the cytoplasm of prokaryotes. In the proce

Define needs of Vitamins arid Minerals in Postoperative Nutritional Care? Vitamins are required for wound healing after a surgery. Vitamin C provides the cementing material of


Which of the following best describes why Okazaki fragments are not observed in PCR? A. DNA primase is used for the entire reaction therefore eliminating the production of Okaz


What does Liquescence digestive enzyme do? It helps to normalize the secretion of digestive juices and enzymes in the gastrointestinal tract

What is Nerve Impulses in human biology? A nerve impulse is an electrical signal carried by a nerve cell. Unlike electrical transmission in wires, this impulse is non-decremen