why does a plant cell need a thick cell wall?
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The relative rigidity of the cell wall renders plants sedentary, unlike animals, whose lack of this type of structure allows their cells more flexibility, which is necessary for locomotion. The plant cell wall serves a variety of functions. Along with protecting the intracellular contents, the structure bestows rigidity to the plant, provides a porous medium for the circulation and distribution of water, minerals, and other nutrients, and houses specialized molecules that regulate growth and protect the plant from disease.(plants do not have an immunity system, and cell wall is a good barrier)
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Yes, guard cells are the only cells in the cell wall that conating chloroplasts. the reason for this been they help to control the opening and the closing of the stomata (the ope that allows gaseous exchange of CO2 and O2.\nDuring the day there is light so the plants can Photosynthesis as CO2 is used up during photosynthesis theCO2 levels in the guard cells falls. This causes water and  salts to be draged into the guard cells and the guard  cells swell up, thus opening the stomata pore .\nAt night CO2 levels are high as photosynthesis cant take place due tothe absence of light and the CO 2 levels rises so water and salt leave the guard cells and they shrink and thus close the stomata pore.
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Formation of a cell wall is a characteristic feature of all plant cells.Its formation in angiosperms does not differ much from its formation in other plants cells.\n After the nuclear division is over (end of karyokinesis)only then the division of cytoplasm(cytokinesis) begins.\n A number of microtubules are laid across the original cell, equidistant from the two recently formed daughter nuclei. They fuse to form middle lamella.This is the first dividing boundery between the two cells. Deposition of cellulose now begins on this middle lamella from either side and the wall formation is completed. Thus, a cell wall in plant cells is by and large made up of a complex carbohydrate called cellulose and in between the two layers of cellulose there is a layer called middle lamella.It is like butter sandwich. Just as the layer of butter holds the two slices of bread together or just as the layer of cement holds two adjecent bricks together and forms a wall; like wise the middle lamella holds the cells together and helps to form a tissue.
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The biggest difference is the cellulose wall that is present on all plant cells but not on animal cells.
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Only plants have chloroplasts and cell walls.
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Most likely fungal cell walls
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vacuoles tend to be very large and are extremely important in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth. Many plant cells have a large, single central vacuole that typically takes up most of the room in the cell (80 percent or more). Vacuoles in animal cells, however, tend to be much smaller, and are more commonly used to temporarily store materials or to transport substances.\n\nBecause the central vacuole is highly selective in transporting materials through its membrane, the chemical palette of the vacuole solution (termed the cell sap) differs markedly from that of the surrounding cytoplasm. For instance, some vacuoles contain pigments that give certain flowers their characteristic colors. The central vacuole also contains plant wastes that taste bitter to insects and animals, while developing seed cells use the central vacuole as a repository for protein storage.\n\nAmong its roles in plant cell function, the central vacuole stores salts, minerals, nutrients, proteins, pigments, helps in plant growth, and plays an important structural role for the plant. Under optimal conditions, the vacuoles are filled with water to the point that they exert a significant pressure against the cell wall. This helps maintain the structural integrity of the plant, along with the support from the cell wall, and enables the plant cell to grow much larger without having to synthesize new cytoplasm. In most cases, the plant cytoplasm is confined to a thin layer positioned between the plasma membrane and the tonoplast, yielding a large ratio of membrane surface to cytoplasm.\n\nThere are more important functions of central vacuole but i guess the functions above are enough for you to understand its role.\n\n:)
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Cellulose is the substance that makes up most of a plant's cell walls. Cellulose is usually described by chemists and biologists as a complex carbohydrate. Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen that function as sources of energy for living things. Plants are able to make their own carbohydrates that they use for energy and to build their cell walls.
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Both are eukaryotic (containing a "true nucleus").  \n\nAnimal Cells lack a cell wall and adjacent cells are connected by junctions (adhesive, gap or tight).  Animal cells contain centrioles (help create microtubules used in mitosis and meiosis) and lysosomes (organelles used to digest wastes and old organelles). During telophase and cytokinesis the cells separate via a cleavage furrow.\n\nPlant Cells contain a cell wall (think of the cell wall as the "skeleton" composed mainly of cellulose) and rely on turgor pressure to keep them upright.  Adjacent cells are connected by channels called plasmodesmata.  You will not find centrioles or lysosomes in a plant cell, but you will find a really cool organelle called a large centrol vacuole.  This organelle is where the water is stored in a cell and it helps maintain the turgor pressure described above.  It also acts as a lysosome, storing chemicals and waste products.  The Central vacuole can also store the pigments you see in flowers as well as poisons used to deter predators.  And of course, in a plant cell you will find the plasts as mentioned by someone earlier.. including the famous chloroplasts (the site for photosynthesis) as well as the chromoplasts (contain pigments) and amyloplasts (specialized for starch storage). During telophase and cytokinesis, the cells are separated by a structure called a cell plate.   \n\nUmmm, that's all I can come up with right now!
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No, the correct answer is A, but not all cells have a cell wall.  All bacteria and all plant and fungal cells have a cell wall in addition to a plasma membrane.  The cell wall is composed of different material in each of these groups; in bacteria it is often a substance called peptidoglycan.  Animal cells on the other hand have a plasma membrane but lack a cell wall.  This is a good thing for people infected with pathogenic bacteria.  The mechanism of action of many antibiotics involves destruction of the bacterial cell wall or interference with its formation, resulting in the death of the bacteria or prevention of their multiplication. There is no damage to the infected human's cells, since they do not have the cell wall.
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cell walls keep the cell rigid, so they can stay upright.\n\ncuticles reduce water loss through evaporation, preventing the plant from being dehydrated
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Because, these cells do not have the microtubule apparatus to do so. The erect a cell wall, instead. Plant cells do not have centrioles.
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They are things that plants need in order to grow.
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Plant cells form a framework of cellulose between the cells which creates a structurs similar to a honeycomb, thereby forming a framework capable of supporting the plant's weight.
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Water travels through a network of 'veins' through out the plant. The cells are re-hydrated which causes them to expand like a balloon. Once the cells are all filled to capacity, they rest on each other. The cell membranes contain cellulose that helps them stand erect when fully hydrated.
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Animal cells have little protection from water induced osmosis.  Leaving a cell in such an environment will surely cause the cell to absorb water until its pressure equalizes with it's surroundings.  Once the pressure reaches this critical level, the cell wall is compromised and it will burst.
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Centrioles.\n\nNucleic acid.\n\nCell membrane is found in both animals and plants but cell wall is found only in plants. Cell wall is made up of cellulose (carbohydrates), while cell membrane is made up of lipids. Cell wall does not regulate the movement of substances in and out of it, but cell membrane does.