Plant Cell Structure Plants are unique among the eukaryotes, organisms whose cells have membrane-enclosed nuclei and organelles, because they can manufacture their own food.
Plant Cell Structure Plants are unique among the eukaryotes, organisms whose cells have membrane-enclosed nuclei and organelles, because they can manufacture their own food. Chlorophyll, which gives plants their green color, enables them to use sunlight to convert water and carbon dioxide into sugars and carbohydrates, chemicals the cell uses for fuel.
Like the fungi, another kingdom of eukaryotes, plant cells have retained the protective cell wall structure of their prokaryotic ancestors.
The basic plant cell shares a similar construction motif with the typical eukaryote cell, but does not have centrioles, lysosomes, intermediate filaments, cilia, or flagella, as does the animal cell.
Plant cells do, however, have a number of other Plant cell structures, including a rigid cell wall, central vacuole, plasmodesmata, and chloroplasts.
Although plants and their typical cells are non-motile, some species produce gametes that do exhibit flagella and are, therefore, able to move about.
Plants can be broadly categorized into two basic types: Vascular plants are considered to be more advanced than nonvascular plants because they have evolved specialized tissues, namely xylem, which is involved in structural support and water conduction, and phloem, which functions in food conduction.
Consequently, they also possess roots, stems, and leaves, representing a higher form of organization that is characteristically absent in plants lacking vascular tissues. The nonvascular plants, members of the division Bryophyta, are usually no more than an inch or two in height because they do not have adequate support, which is provided by vascular tissues to other plants, to grow bigger.
They also are more dependent on the environment that surrounds them to maintain appropriate amounts of moisture and, therefore, tend to inhabit damp, shady areas. It is estimated that there are at leastspecies of plants in the world today.
They range in size and complexity from small, nonvascular mosses to giant sequoia Plant cell, the largest living organisms, growing as tall as feet meters. Only a tiny percentage of those species are directly used by people for food, shelter, fiber, and medicine.
Nonetheless, plants are the basis for the Earth's ecosystem and food web, and without them complex animal life forms such as humans could never have evolved.
Indeed, all living organisms are dependent either directly or indirectly on the energy produced by photosynthesis, and the byproduct of this process, oxygen, is essential to animals.
Plants also reduce the amount of carbon dioxide present in the atmosphere, hinder soil erosion, and influence water levels and quality. Plants exhibit life cycles that involve alternating generations of diploid forms, which contain paired chromosome sets in their cell nuclei, and haploid forms, which only possess a single set.
Generally these two forms of a plant are very dissimilar in appearance. In higher plants, the diploid generation, the members of which are known as sporophytes due to their ability to produce spores, is usually dominant and more recognizable than the haploid gametophyte generation.
In Bryophytes, however, the gametophyte form is dominant and physiologically necessary to the sporophyte form.
Animals are required to consume protein in order to obtain nitrogen, but plants are able to utilize inorganic forms of the element and, therefore, do not need an outside source of protein. Plants do, however, usually require significant amounts of water, which is needed for the photosynthetic process, to maintain cell structure and facilitate growth, and as a means of bringing nutrients to plant cells.
The amount of nutrients needed by plant species varies significantly, but nine elements are generally considered to be necessary in relatively large amounts. Termed macroelements, these nutrients include calcium, carbon, hydrogen, magnesium, nitrogen, oxygen, phosphorus, potassium, and sulfur. Seven microelements, which are required by plants in smaller quantities, have also been identified: Thought to have evolved from the green algae, plants have been around since the early Paleozoic era, more than million years ago.
The earliest fossil evidence of land plants dates to the Ordovician Period to million years ago. By the Carboniferous Period, about million years ago, most of the Earth was covered by forests of primitive vascular plants, such as lycopods scale trees and gymnosperms pine trees, ginkgos. Cell Wall - Like their prokaryotic ancestors, plant cells have a rigid wall surrounding the plasma membrane.
It is a far more complex structure, however, and serves a variety of functions, from protecting the cell to regulating the life cycle of the plant organism. Chloroplasts - The most important characteristic of plants is their ability to photosynthesize, in effect, to make their own food by converting light energy into chemical energy.
This process is carried out in specialized organelles called chloroplasts. Endoplasmic Reticulum - The endoplasmic reticulum is a network of sacs that manufactures, processes, and transports chemical compounds for use inside and outside of the cell.
It is connected to the double-layered nuclear envelope, providing a pipeline between the nucleus and the cytoplasm. In plants, the endoplasmic reticulum also connects between cells via the plasmodesmata.
Golgi Apparatus - The Golgi apparatus is the distribution and shipping department for the cell's chemical products.
It modifies proteins and fats built in the endoplasmic reticulum and prepares them for export as outside of the cell. Microfilaments - Microfilaments are solid rods made of globular proteins called actin. These filaments are primarily structural in function and are an important component of the cytoskeleton.
Microtubules - These straight, hollow cylinders are found throughout the cytoplasm of all eukaryotic cells prokaryotes don't have them and carry out a variety of functions, ranging from transport to structural support.
Mitochondria - Mitochondria are oblong shaped organelles found in the cytoplasm of all eukaryotic cells. In plant cells, they break down carbohydrate and sugar molecules to provide energy, particularly when light isn't available for the chloroplasts to produce energy.
Nucleus - The nucleus is a highly specialized organelle that serves as the information processing and administrative center of the cell.The basic plant cell has a similar construction to the animal cell, but does not have centrioles, lysosomes, cilia, or flagella. It does have additional structures, a rigid cell wall, central vacuole, plasmodesmata, and chloroplasts.
Explore the structure of a plant cell with our three-dimensional graphics.
Jun 06, · Plant cells are more complicated and exciting than you might think! This video shows you the structure of the plant cell. Sam introduces you to the cell organelles and their functions. A plant cell is the structural and functional unit of a plant.
Plant cells generally form several different colonies in order to become a higher functioning organism. While plant cells group together to form higher organisms, each individual plant cell contains many different and important.
Noun 1. plant cell - a cell that is a structural and functional unit of a plant cell - (biology) the basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals cell wall - a rigid.
Plant cells are eukaryotic cells of the types present in green plants, photosynthetic eukaryotes of the kingdom Plantae.
Their distinctive features include primary cell walls containing cellulose, hemicelluloses and pectin, the presence of plastids with the capability to perform photosynthesis and store starch, a large vacuole that regulates turgor pressure, the absence of flagellae or.
Plant Cell. A plant cell is defined as a cell which has a nucleus and organelles bounded by a thick and rigid cell wall. Within this rigid cell wall, there are chloroplast organelles containing chlorophyll.