Seed:

A seed is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth within the motherplant. The formation of the seed completes the process of reproduction in seed plants, with the embryo developed from the zygote and the seed coat from the integuments of the ovule.

This process starts with double fertilization in angiosperms and it involves the fusion of the egg and sperm nuclei into a zygote. The second part of this process is the fusion of the polar nuclei with a second sperm cell nucleus, thus forming a primary endosperm. Right after fertilization the zygote is mostly inactive but the primary endosperm divides rapidly to form the endosperm tissue. This tissue becomes the food that the young plant will consume until the roots have developed after germination or it develops into a hard seed coat. The seed, which is an embryo with two points of growth is enclosed in a seed coat with some food reserves. In gymnosperms the two sperm cells transferred from the pollen do not develop seed by double fertilization but instead only one sperm fertilizes the egg while the other is not used. The seed is composed of the embryo and tissue from the mother plant, which also form a cone around the seed in coniferous plants like Pine and Spruce.
 
Seed also has a general meaning which predates the above - any thing that can be sown i.e. "seed" potatoes, "seeds" of corn or sunflower "seeds". In the case of sunflower and corn "seeds", what is sown is the seed enclosed in a shell or hull, and the potato is a root or stem depending on what is being sowed. Seeds have been an important development in the reproduction and spread of flowering plants, relative to more primitive plants like mosses, ferns and liverworts, which do not have seeds and use other means to propagate themselves. This can be seen by the success of seed plants in dominating biological niches on land, from forests to grasslands both in hot and cold climates. Seeds have been an important development in the reproduction and spread of flowering plants, relative to more primitive plants like mosses, ferns and liverworts, which do not have seeds and use other means to propagate themselves. This can be seen by the success of seed plants in dominating biological niches on land, from forests to grasslands both in hot and cold climates.
 
Form
(*) mark fields are necessary
   
Your Name*
Your E mail*
Phone Number*
Details*
 
Extended Hotels in Biloxi Mississippi Hotel in Mckerrow Ontario Comfortable Hotel near Butler PA
Luxury Hotel in Muncie Indiana Hotel in Downtown Kansas City Discounted Hotel in Pacific Grove
 
 
Seed Functions:

Seeds protect and nourish the embryo or baby plant. Seeds usually give a seedling a faster start than a sporling from a spore gets because of the larger food reserves in the seed.

Unlike animals, plants are limited in their ability to seek out favorable conditions for life and growth. As a consequence, plants have evolved many ways to disperse their population through their seeds. A seed must somehow "arrive" at a location and be there at a time favorable for germination and growth. Seed dispersal is often attributed mainly to fruits, however many seeds aid in their own dispersal,

 
Best Automotive Resources:

Auto India - Provides trusted and certified Car Dealer and Car Dealers from www.autoindia.com
Visit: Car Loan
 
:: Home :: Structure of Seed :: Seed Company :: Economy Important of Seed :: Contact Us :: Relaxing Retreat ::
 

© 2007 by urbanceed.org - All Rights Reserved.