Plants are one of five big groups (kingdoms) of living things. They are autotrophic eukaryotes, which means they have complex cells, and make their own food. Usually they cannot move (not counting growth).
Plants include familiar types such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The scientific study of plants, known as botany, has identified about 350,000 extant (living) species of plants. Fungi and non-green algae are not classified as plants.
Most plants grow in the ground, with stems above the atmosphere, and roots below. Some float on water. Water and some nutrients come from the roots. Then climb the stem and reach the leaves. The evaporation of water from pores in the leaves pulls water through the plant. This is called transpiration.Plants are one of five big groups (kingdoms) of living things. They are autotrophic eukaryotes, which means they have complex cells, and make their own food. Usually they cannot move (not counting growth).
С т р а н и ц а | 1
Plants are one of five big groups (kingdoms) of living things. They are autotrophic eukaryotes,
which means they have complex cells, and make their own food. Usually they cannot move (not
Plants include familiar types such as trees, herbs, bushes, grasses, vines, ferns, mosses, and green
algae. The scientific study of plants, known as botany, has identified about
350,000 extant (living) species of plants. Fungi and nongreen algae are not classified as plants.
Most plants grow in the ground, with stems above the atmosphere, and roots below. Some float
on water. Water and some nutrients come from the roots. Then climb the stem and reach the
leaves. The evaporation of water from pores in the leaves pulls water through the plant. This is
A plant needs sunlight, carbon dioxide, minerals and water to make food by photosynthesis. A
green substance in plants called chlorophyll traps the energy from the Sun needed to make food.
Chlorophyll is mostly found in leaves, inside plastids, which are inside the leaf cells. The leaf
can be thought of as a food factory. Leaves of plants vary in shape and size, but they are always
the plant organ best suited to capture solar energy. Once the food is made in the leaf, it is
transported to the other parts of the plant such as stems and roots.
The word "plant" can also mean to put something in the earth. For
example, farmers plant seeds in the ground.
Photosynthesis is a process that is taken place by the leaves on the plant. The leaves are the only
parts of a plant that can do this process (as they adapted). This is also known as how the plant
gets its food.
Types of plants[change | change source]
Land plants (embryophytes)
Nonvascular plants (bryophytes):
Vascular plants (tracheophytes)
Pteridophyta: the ferns
Pteridopsida: the typical ferns С т р а н и ц а | 2
Sphenopsida: the horsetails
Marattiopsida: a divergent group of ferns
Psilotopsida: sistergroup to all other ferns
Seed plants (spermatophytes)
Pinophyta: the conifers
Cycadophyta: the cycads
Ginkgophyta: the ginkgos
Gnetophyta: sister group to the Angiosperms
Magnoliophyta or Angiosperms (flowering
The plant food factory[change | change source]
Chloroplasts visible in the cells of Plagiomnium affine
At least some plant cells contain photosynthetic organelles (plastids) which enable them to
make food for themselves. With sunlight, water, and carbon dioxide, the plastids make sugars,
the basic molecules needed by the plant. Free oxygen (O2) is produced as a byproduct of
Later, in the cell cytoplasm, the sugars may be turned into amino
acids for proteins, nucleotides for DNA and RNA, and carbohydrates such as starch. This
process needs certain minerals: nitrogen, potassium, phosphorus, iron and magnesium.
Plant nutrients[change | change source]
Plant nutrition is the study of the chemical elements that are necessary for plant growth.
N = Nitrogen (Carbohydrates)
P = Phosphorus (ATP and the energy cycle)
K = Potassium (water regulation)
Ca = Calcium (transport of other nutrients)
Mg = Magnesium (enzymes) С т р а н и ц а | 3
S = Sulfur (some amino acids)
Si = Silicon (cell walls)
Micronutrients (trace elements) include:
Cl = Chlorine (osmosis and ion balance)
Fe = Iron (photosynthesis ans enzyme cofactor)
B = Boron (sugar transport and cell division)
Mn = Manganese (building chloroplasts)
Na = Sodium (various)
Zn = Zinc (many enzymes)
Cu = Copper (photosynthesis)
Ni= Nickel (an enzyme)
Mo = Molybdenum (enzyme cofactors)
Roots[change | change source]
The roots of plants perform two main functions. First, they anchor the plant to the ground.
Second, they absorb water and various nutrients dissolved in water from the soil. Plants use the
water to make food. The water also provides the plant with support. Plants that lack water
become very limp and their stems cannot support their leaves. Plants which specialise
in desert areas are called xerophytes or phreatophytes, depending on the type of root growth.
Water is transported from the roots to the rest of the plant through special vessels in the plant.
When the water reaches the leaves, some of it evaporates into the air. Many plants need the help
of fungi to make their roots work properly. This plant/fungi symbiosis is
called mycorrhiza. Rhizobia bacteria in root nodules help some plants get nitrogen.
Flowering plant reproduction[change | change source]
Main page: Flowering plant sexuality
Flowers and pollination[change | change source]
Flowers are the reproductive organ only of flowering plants (Angiosperms). The petals of a
flower are often brightly colored and scented to attract insects and other pollinators.
The stamen is the male part of the plant. It is composed of the filament (a stalk) that holds
the anther, which produces the pollen. Pollen is needed for plants to produce seeds.
The carpel is the female part of the flower. The top part of the carpel contains the stigma.
The style is the neck of the carpel. The ovary is the swollen area at the bottom of the carpel.
The ovary produces the seeds. The sepal is a leaf that protects a flower as a bud.
The process by which pollen gets transferred from one flower to another flower is
called pollination. This transfer can happen in different ways. Insects such as bees are
attracted to bright, scented flowers. When bees go into the flower to gather nectar, the spiky С т р а н и ц а | 4
pollen sticks to their back legs. The sticky stigma on another flower catches the pollen when
the bee lands or flies nearby it.
Some flowers use the wind to carry pollen. Their dangling stamens produce lots of pollen
that is light enough to be carried by the wind. Their flowers are usually small and not highly
coloured. The stigmas of these flowers are feathery and hang outside the flower to catch the
pollen as it falls.
Seed travelers[change | change source]
A plant produces many spores or seeds. Lower plants such as moss and ferns produce spores.
The seed plants are the Gymnosperms and Angiosperms. If all the seeds fell to the ground
besides the plant, the area might become overcrowded. There might not be enough water and
minerals for all the seeds. Seeds usually have some way to get to new places. Some seeds
can be dispersed by the wind or by water. Seeds inside juicy fruits are dispersed after being
eaten. Sometimes, seeds stick to animals and are dispersed that way.
Fossils[change | change source]
The question of the earliest plant fossils depends on what is meant by the word "plant".
If by plants we mean phototrophs using chlorophyll,
then cyanobacteria in stromatolites are the first fossils, 3,450 million years ago (mya)
in the Archaean eon. The remarkable precision is possible because the fossils were
sandwiched between lava flows that could be precisely dated from
embedded zircon crystals.
If by plants we include all types of algae, then the earliest known red algae lived 1.6
billion years ago. Fossils of them were recently found in India.
If by plants we mean green plants, Viridiplantae, then the first fossils are green algae.
This is probably the majority position amongst professional botanists. There is
convincing evidence for the monophyly of charophyte green
algae and embryophytes. There are still two choices:
1. Acritarchs (a group of organicwalled microfossils) may be
reproductive cysts of green algae. If so, they are present in
the Neoproterozoic era, 1000 mya.
2. Otherwise, there is a large increase in planktonic algae around 540 mya in
the Cambrian period.
If by plants we mean land plants, the first fossils are in the Silurian.
By the Silurian, fossils of whole plants are preserved, including
the lycophyte Baragwanathia longifolia. From the Devonian, detailed fossils
of rhyniophytes have been found. Early fossils of these ancient plants show the individual
cells within the plant tissue. The Devonian period also saw the evolution of the first tree in
the fossil record, Wattezia. This fernlike tree had a trunk with fronds, and produced spores.
The coal measures are a major source of Palaeozoic plant fossils, with many groups of plants
in existence at this time. The spoil heaps of coal mines are the best places to
collect; coal itself is the remains of fossilised plants, though structural detail of the plant fossils is rarely visible in coal. In the Fossil Forest at Victoria Park in Glasgow the stumps
of Lepidodendron trees are found in their original growth positions.
botany [ b t n ] ботаника
ˈ ɔ ə ɪ
С т р а н и ц а | 5
ɔː əˈ əʊ ɪ
f k] автотрофный
eukaryote [ju k r
ː ə ɪˈəʊ
herb [h b] трава
Bush [b ] кустарник
vine [va n] лоза
fern [f n] папоротник
moss [m s] лишайник
algae [ æl
ˈ ʤ ː
i ] водоросли
stems [stemz] побеги стебель stem
leaf [li f] лиst
roots [ru ts] корни
transpiration [trænsp re n] транспирацияж, испарение
plastid [ pl
ˈ ɑː ɪ
st d] пластида
fruit [fru t] фруктым, плоды
grain [gre n] зерно
flower [ fla