Seed, Biology

Seed

A seed is a mature ovule enclosing an embryonic plant, stored food material (in endosperm, persistent nucellus or embryo itself) and a seed coat formed by one or two integuments. In h broad sense the term seed is also applied to small one-seeded, dry fruits (e.g., grains of wheat or barley which are in fact made up by fusion of fruit wall and seed coat) or other disseminules (fruits with attached bracts, inflorescences or even vegetative structures such as tubers and bulbils). The size, shape, color and surface of the seed show innumerable variations. Most orchids have minute seeds like dust particles.

Seeds of a majority of flowering plants are a few millimeters in diameter (e.g., mustard, guava and poppy) or extend to a length of about a centimeter (e.g., castor, cucumber and groundnut). Some tropical trees and lianas have fruits with very large seeds. The double coconut, Lodoicea maldivica has bilobed seeds as large as 10 cm weighing nearly 6 kg. The seed surface may be smooth, wrinkled, striated, ribbed, furrowed or it may have a variety of patterns on it. The surface may be glossy (as in linseed and castor), fleshy or pulpy (in Magnolia) or covered with hair (in cotton).

Posted Date: 1/23/2013 8:02:25 AM | Location : United States







Related Discussions:- Seed, Assignment Help, Ask Question on Seed, Get Answer, Expert's Help, Seed Discussions

Write discussion on Seed
Your posts are moderated
Related Questions
what is the life cycle of a protozoa

Q. Do plants have tissue organization and specialized organs? Plants have specialized organs (like roots, limbs, reproductive organs, leaves) and differentiated tissues (suppor

Q. How do bones grow? Bones form and develop through a process known as ossification. There are two types of ossification: endochondral ossification and intramembranous ossific

How can we determine the status of brain function Neuropsychological assessment is the clinical practise of using tests and other behavioural evaluation instruments to determin

Define Drug Effects on Food Intake - gastro intestinal tract? Affect the gastro intestinal tract: Gastrointestinal irritation and ulceration are serious problems with many drug

Agro Industrial-Baling and cubing Bailing is one of the most common processes used for the conservation of green fodders and grasses in many developed countries and attempts ha

Q. Explain about Dietary Management? Treatment for gout often include a diet of lower purine intake. Indeed, about one third of the body's uric acid can be attributed to diet.

Ross Operation :  In this technically demanding operation, the aortic valve is replaced by patient's own pulmonary valve (autograft) and a pulmonary or aortic allograft (homo

Define the Principles of Periapical Surgery (PAS)   1. Avoid horizontal, sever angled vertical incision Because the collagen fibers of the mucoperiosteum are parallel to the to