let's study english
Jumat, 14 November 2014
Minggu, 10 November 2013
Senin, 05 November 2012
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Magnoliophyta,
also called angiosperms). The biological function of a flower is to
effect reproduction, usually by providing a mechanism for the union of
sperm with eggs. Flowers may facilitate outcrossing (fusion of sperm and
eggs from different individuals in a population) or allow selfing
(fusion of sperm and egg from the same flower). Some flowers produce diaspores without fertilization (parthenocarpy).
Floral" redirects here. For other uses, see Floral (disambiguation).
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Magnoliophyta,
also called angiosperms). The biological function of a flower is to
effect reproduction, usually by providing a mechanism for the union of
sperm with eggs. Flowers may facilitate outcrossing (fusion of sperm and
eggs from different individuals in a population) or allow selfing
(fusion of sperm and egg from the same flower). Some flowers produce diaspores without fertilization (parthenocarpy).
Flowers contain sporangia and are the site where gametophytes develop.
Flowers give rise to fruit and seeds. Many flowers have evolved to be
attractive to animals, so as to cause them to be vectors for the
transfer of pollen.
In addition to facilitating the reproduction of flowering plants, flowers have long been admired and used by humans to beautify their environment, and also as objects of romance, ritual, religion, medicine and as a source of food.
In addition to facilitating the reproduction of flowering plants, flowers have long been admired and used by humans to beautify their environment, and also as objects of romance, ritual, religion, medicine and as a source of food.
Rabu, 09 November 2011
Alphabet
An alphabet is a standard set of letters—basic written symbols or graphemes—each of which represents a phoneme in a spoken language, either as it exists now or as it was in the past. There are other systems, such as logographies, in which each character represents a word, morpheme, or semantic unit, and syllabaries, in which each character represents a syllable. Alphabets are classified according to how they indicate vowels:
- the same way as consonants, as in Greek (true alphabet)
- diacritics or modification of consonants, as in Hindi (Devanāgarī: हिन्दी ) (abugida)
- not at all, as in Phoenician (abjad)
Langganan:
Komentar (Atom)
