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Cotyledon

Definition

noun, plural: cotyledons

(1) (botany) The primary or rudimentary leaf of the embryo of a seed plant that either remains in the seed or emerges upon seed germination; a modified leaf that is part of the plant embryo within the seed; a seed leaf.

(2) (plant taxonomy) A genus of the Crassulaceae family first described by Linnaeus, which include plants with succulent leaves that are opposite, stiff, and persistent, corolla of five petals fused into a tube, flowers that are tubular and bell-like, and stamens that are ten in two whorls, such as the species Cotyledon tomentosa commonly known as Bear's Paw.

(3) (anatomy) Any of the lobules located on the uterine surface of the detached placenta, consisting mainly of a rounded mass of villi; the functional unit of the placenta.


Supplement

Botany: In plants, the cotyledons are involved in the storage or absorption of food reserves. The number of cotyledons is one of the plant characteristics used in grouping angiosperms into monocots and dicots.

Anatomy: In humans, a full term placenta contains about 20 cotyledons that are surrounded with maternal blood which contact the villous trees from the fetal circulation. Exchanges of gases (oxygen and carbon dioxide) and nutrients between the mother and her fetus take place here.


Word origin: Latin cotylēdōn, navelwort, from Greek kotulēdōn, from kotulē, hollow object

Synonym:

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Monocot vs Dicot

Difference between Monocots and Dicots, Monocots have a single cotyledon,Dicots have two cotyledons Leaves of Monocots have parallel veinations and leaves of Dicot have branched veinations. Monocots have fibrous roots and Dicots have tap roots.

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by sumita
Thu Sep 02, 2010 12:42 pm
 
Forum: Botany Discussion
Topic: Monocot vs Dicot
Replies: 2
Views: 27418

Plant Genetics help

so the reason for polyploidy is adaptability how tho, what does having extra chromosomes give u? and the 3n of the cotyledon or endosperm (fusion of sperm and 2 polar bodies) is to make the "food" of the seed grow faster?

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by SolarwingGX
Sun Jul 04, 2010 11:59 pm
 
Forum: General Discussion
Topic: Plant Genetics help
Replies: 2
Views: 1499

Plant Genetics help

cotyledon? I don't think so. IMHO is the reason that 3n means more genetic basis to have speeder metabolism.But I'm just guessing. Anyway, plants are little bit more flexible. Although we think we (and animals) are the kings, ...

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by JackBean
Sun Jul 04, 2010 10:44 pm
 
Forum: General Discussion
Topic: Plant Genetics help
Replies: 2
Views: 1499

Plant Genetics help

I'm aware of double fertilization and where 3n comes from and how the 2 polar bodies fused with 1 sperm to form the cotyledon, but what is the genetic function or more vaguely biological function of the 3n speaking of chromosomes, is this the reason why plants are more successful ...

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by SolarwingGX
Sun Jul 04, 2010 8:42 pm
 
Forum: General Discussion
Topic: Plant Genetics help
Replies: 2
Views: 1499

The Fiber Disease

... into the genetic control of plant embryo development. This objective was realized in part through the analysis of mutants with alterations in cotyledon and suspensor cell identity. Other mutants provided valuable clues to basic questions in plant metabolism, physiology, and cell biology. Extensive ...

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by London
Sun Nov 05, 2006 2:10 am
 
Forum: Human Biology
Topic: The Fiber Disease
Replies: 7403
Views: 4988492
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