Plant - Plant Evolution And Classification, Evolution Of Plants, Classification Of Plants, Plant Structure, Plant Development
life phase chlorophyll biologists
A plant is an organism in the kingdom Plantae. According to the five-kingdom classification system used by most biologists, plants have the following characteristics: they are multicellular during part of their life; they are eukaryotic, in that their cells have nuclei; they reproduce sexually; they have chloroplasts with chlorophyll-a, chlorophyll-b and carotenoids as photosynthetic pigments; they have cell walls with cellulose, a complex carbohydrate; they have life cycles with an alternation of a sporophyte phase and a gametophyte phase; they develop organs which become specialized for photosynthesis, reproduction, or mineral uptake; and most live on land during their life cycle.
Biologists have identified about 500,000 species of plants, although there are many undiscovered species in the tropics.
Additional Topics
From the time of Aristotle until the 1950s, most people classified all organisms into the animal kingdom or the plant kingdom. Fungi and plant-like, single-celled organisms were placed into the plant kingdom, in view of certain highly derived, but superficial characteristics of these organisms. In 1959, Robert Whittaker advocated a five-kingdom classification system. According to a recent modifica…
There was little life on land 500 million years ago, although the oceans abounded with diverse photosynthetic organisms, as well as species in the Monera, Protoctista, and Animalia kingdoms. Land plants appear to have evolved from photosynthetic, aquatic ancestors about 500 million years ago, probably from the Chlorophyta, or green algae. Both groups use chlorophyll-a and chlorophyll-b as photosyn…
All species are classified hierarchically. Related species are grouped into a genus; related genera into a family; related families into an order; related orders into a class; related classes into a phylum; and related phyla into a kingdom. Below, the most significant characteristics of the nine phyla of the kingdom Plantae are briefly considered. Bryophyta is a phylum with three classes, the larg…
The seed plants (gymnosperms and angiosperms) are the dominant and most studied group of plants, so their anatomy and development are considered here. The leaves and other aerial portions are all covered with a cuticle, a waxy layer that inhibits water loss. The leaves have stomata, microscopic pores which open in response to certain environmental cues for uptake of carbon dioxide and release of o…
As a plant grows, it undergoes developmental changes, known as morphogenesis, which include the formation of specialized tissues and organs. Most plants continually produce new sets of organs, such as leaves, flowers, and fruits, as they grow. In contrast, animals typically develop their organs only once, and these organs merely increase in size as the animal grows. The meristematic tissues of pla…
The cells of plants, fungi, and bacteria are surrounded by rigid cell walls. Plant cell walls are typically one to five micrometers thick, and their primary constituent is cellulose, a molecule consisting of many glucose units connected end-to-end. In plant cell walls, many cellulose molecules are bundled together into microfibrils (small fibers), like the fibers of a string. These microfibrils ha…
Plants provide food to humans and all other nonphotosynthetic organisms, either directly or indirectly. Agriculture began about 10,000 years ago in the fertile crescent of the Near East, where people first cultivated wheat and barley. Scientists believe that as people of the fertile crescent gathered wild seeds, they selected for certain genetically determined traits, which made the plants produce…
Citing this material
Please include a link to this page if you have found this material useful for research or writing a related article. Content on this website is from high-quality, licensed material originally published in print form. You can always be sure you're reading unbiased, factual, and accurate information.
Highlight the text below, right-click, and select “copy”. Paste the link into your website, email, or any other HTML document.
User Comments
about 1 year ago
tayyab
hot
about 1 year ago
dina
oluhnu
about 1 year ago
genet
Plant - Plant Evolution And Classification, Evolution Of Plants, Classification Of Plants, Plant Structure, Plant Development
life phase chlorophyll biologists species kingdom
A plant is an organism in the kingdom Plantae. According to the five-kingdom classification system used by most biologists, plants have the following characteristics: they are multicellular during part of their life; they are eukaryotic, in that their cells have nuclei; they reproduce sexually; they have chloroplasts with chlorophyll-a, chlorophyll-b and carotenoids as photosynthetic pigments; they have cell walls with cellulose, a complex carbohydrate; they have life cycles with an alternation of a sporophyte phase and a gametophyte phase; they develop organs which become specialized for photosynthesis, reproduction, or mineral uptake; and most live on land during their life cycle.
Biologists have identified about 500,000 species of plants, although there are many undiscovered species in the tropics.
Additional Topics
Plant - Plant Evolution And Classification
From the time of Aristotle until the 1950s, most people classified all organisms into the animal kingdom or the plant kingdom. Fungi and plant-like, single-celled organisms were placed into the plant kingdom, in view of certain highly derived, but superficial characteristics of these organisms. In 1959, Robert Whittaker advocated a five-kingdom classification system. According to a recent modifica…
Plant - Evolution Of Plants
There was little life on land 500 million years ago, although the oceans abounded with diverse photosynthetic organisms, as well as species in the Monera, Protoctista, and Animalia kingdoms. Land plants appear to have evolved from photosynthetic, aquatic ancestors about 500 million years ago, probably from the Chlorophyta, or green algae. Both groups use chlorophyll-a and chlorophyll-b as photosyn…
Plant - Classification Of Plants
All species are classified hierarchically. Related species are grouped into a genus; related genera into a family; related families into an order; related orders into a class; related classes into a phylum; and related phyla into a kingdom. Below, the most significant characteristics of the nine phyla of the kingdom Plantae are briefly considered. Bryophyta is a phylum with three classes, the larg…
Plant - Plant Structure
The seed plants (gymnosperms and angiosperms) are the dominant and most studied group of plants, so their anatomy and development are considered here. The leaves and other aerial portions are all covered with a cuticle, a waxy layer that inhibits water loss. The leaves have stomata, microscopic pores which open in response to certain environmental cues for uptake of carbon dioxide and release of o…
Plant - Plant Development
As a plant grows, it undergoes developmental changes, known as morphogenesis, which include the formation of specialized tissues and organs. Most plants continually produce new sets of organs, such as leaves, flowers, and fruits, as they grow. In contrast, animals typically develop their organs only once, and these organs merely increase in size as the animal grows. The meristematic tissues of pla…
Plant - Characteristics Of Plant Cells
Plant - Cell Structures And Their Functions
The cells of plants, fungi, and bacteria are surrounded by rigid cell walls. Plant cell walls are typically one to five micrometers thick, and their primary constituent is cellulose, a molecule consisting of many glucose units connected end-to-end. In plant cell walls, many cellulose molecules are bundled together into microfibrils (small fibers), like the fibers of a string. These microfibrils ha…
Plant - Importance To Humans
Plants provide food to humans and all other nonphotosynthetic organisms, either directly or indirectly. Agriculture began about 10,000 years ago in the fertile crescent of the Near East, where people first cultivated wheat and barley. Scientists believe that as people of the fertile crescent gathered wild seeds, they selected for certain genetically determined traits, which made the plants produce…
plant [next] [back] plano-convex lens
Citing this material
Please include a link to this page if you have found this material useful for research or writing a related article. Content on this website is from high-quality, licensed material originally published in print form. You can always be sure you're reading unbiased, factual, and accurate information.
Highlight the text below, right-click, and select “copy”. Paste the link into your website, email, or any other HTML document.
Plant - Plant Evolution And Classification, Evolution Of Plants, Classification Of Plants, Plant Structure, Plant Development
User Comments
Name
Email
Your email address will be altered so spam harvesting bots can't read it easily.
Hide my email completely instead?
Body
over 4 years ago
I think a lot of biologists would now say a six kingdom classification system is correct. Monera has been split into the Eubacteria and the Archeabacteria.