Essays Tagged: "plant cells"

Biology experiment on osmosis for gcse very good got an A* as course work so do not miss out

s turgid and hard as water enters the cell or it becomes dehydrated (this is called plasmolysing in plant cells) as water leaves the cell and the solution enters. There is a change of mass, volume, te ... reach an isotonic equilibrium. The potato cells become turgid and hydrated. However the potato is a plant therefore it has a cell wall that means that at some point the cell wall will stop letting in ...

(15 pages) 314 2 4.2 Mar/2002

Subjects: Science Essays > Biology > Plant Biology

Discuss the xylem and phloem. (Structure, Changes in the Xylem of Woody Plants, Transport)

t and transport. Cells that will become xylem add more material to the primary cell walls that most plant cells lay down. The thicker walls can be either disconnected rings or extensive secondary cell ... these cells are stacked on top of each other. Tracheids are conducting cells of primitive vascular plants and they're long and extremely thin cells. Important in the transport is rays. Rays run from ...

(4 pages) 152 4 4.5 Jan/2003

Subjects: Science Essays > Biology > Plant Biology

"Experiment to investigate the effect of osmosis in potatoes" A GCSE experiment looking at the effects of the concentration of sucrose solution on osmosis in potato tubers.

Osmosis in PotatoesThe aim of this experiment is to investigate the movement of water in and out of plant cells. The cells chosen for study will be taken from potato tubers. Firstly I will explain wha ... i.e. a very high concentration of sucrose solution: a low water concentration.The water content of plants varies depending on environmental conditions. In Land plants this water plays a vital role in ...

(11 pages) 191 1 4.7 Jan/2003

Subjects: Science Essays > Biology

Eukaryotic Cells, all organelles explained with functions.

Eukaryotic Cell vs. Prokaryotic EssayA eukaryotic plant cell consists of many organelles, a cell wall, and a nucleus. Unlike an animal cell, plant cel ... and a nucleus. Unlike an animal cell, plant cells have cell walls that allow them to bind to other plant cells, hold their structure, and prevent excessive water intake. Young plant cells have a prim ... ration is the process of generating ATP from sugars and fats. Chloroplasts, which are only found in plant cells, are the sites of photosynthesis, the conversion of solar energy to chemical energy by a ...

(4 pages) 106 0 4.0 Nov/2003

Subjects: Science Essays > Biology

Photosynthesis Coursework

IntroductionPhotosynthesis is how plants get their food. The reason why plants have leaves, roots or being green is all linked to phot ... why plants have leaves, roots or being green is all linked to photosynthesis. In photosynthesis, a plant takes carbon dioxide from the air and water from the soil and uses the light from sunlight to ... . Photosynthesis occurs only in the presence of light, and takes place in the chloroplasts of green plant cells. Photosynthesis can be defined as the production of simple sugars from carbon dioxide an ...

(5 pages) 72 0 1.0 Mar/2004

Subjects: Science Essays > Biology > Plant Biology

Biology investigation osmosis

ecules to pass through it from the dilute to the concentrated solution.Turgidity and FlaccidityWhen plant cells are placed in water, the water enters the cells. As water enters it makes the cell swell ...

(5 pages) 29 0 4.3 Apr/2004

Subjects: Science Essays > Biology

The effect on Potato in Salt Solution. J de Salles

Potato in Salt SolutionScenarioPlants in the soil have their roots in a dilute solution of mineral ions. When they are suddenly flo ... ecome flaccid.AimThe aim of this experiment is to investigate the movement of water into and out of plant cells by osmosis. The cells chosen for study will be taken from potato tubers as they provide ... hat is able to dissolve another substance, called a solute, to form a solution.The water content of plants varies depending on environmental conditions. In land plants it plays a vital role in structu ...

(6 pages) 44 0 4.0 Apr/2004

Subjects: Science Essays > Biology

How light intensity effects the rate of photosynthesis.

changing light intensity on the rate of photosynthesis.What is Photosynthesis?Photosynthesis is how plants get their food. The reasonwhy plants have leaves, roots or being green is all linkedto photos ... onwhy plants have leaves, roots or being green is all linkedto photosynthesis. In photosynthesis, a plant takescarbon dioxide from the air and water from the soil anduses the light from sunlight to tu ...

(8 pages) 81 0 4.0 Dec/2004

Subjects: Science Essays > Biology > Plant Biology

Rate of Photosynthesis.

esence of chlorophyll and light produces Glucose + OxygenThis process occurs in the chloroplasts of plant cells which are primarily found in the leaves.To measure the rate of photosynthesis in this pr ...

(5 pages) 52 0 0.0 Oct/2005

Subjects: Science Essays > Biology > Plant Biology

Cell walls revised.

Plant cells have a cell wall, large central vacuole, and plasmodesmata.Like other eukaryotes, plants ... e other eukaryotes, plants have a nucleus, plasma membrane, mitochondria, and other organelles, but plant cells differ from animal, fungal, and protist cells in a number of important ways. The most ob ... remaining flexible; flower petals, for instance, are flexible but will snap if folded too far.When plant cells divide, they must form a new cell wall between them, and this is accomplished by the for ...

(2 pages) 16 0 0.0 Dec/2005

Subjects: Science Essays > Biology

Coral reefs.

and divide. Corals usually need light to be able to grow because their bodies contain single-celled plant cells which use photosynthesis to grow. How much light corals can gather is one of the factors ... hand use the three-dimensional structure of the reefs to try and ambush their prey.Both animals and plants depend on coral reefs for shelter as well as protection. Humans also depend on coral reefs fo ...

(6 pages) 41 0 1.5 Jan/2006

Subjects: Science Essays > Biology

Year 12 Biology Coursework; Why does raw turnip taste sweeter than raw potato?

e making it a lot more easier to distinguish which has the highest concentration of dissolved sugar.Plant cells have a cell surface membrane. Outside this there is the cellulose cell wall. Inside a pl ... . Inside a plant cell there is a solution of solutes, many of which can be found in the vacuole. In plants water flows through the cell wall and cell surface membrane into the vacuole from the outside ...

(7 pages) 22 0 3.0 Mar/2006

Subjects: Science Essays > Biology

Examining chloroplasts

Aim:To look at the cells from a water plant and to show its chloroplasts.Materials/Equipment:MicroscopeSlideElodea plantWater DropperCover ... plantWater DropperCover slipLampMethod:1. prepare microscope and lamp2. take a leaf from the water plant and put it onto the slide3. put 2 drops of water onto the leaf4. carefully place cover slip ov ... es so they don't need or have a cell wall to give them steady support.Conclusion:I learned that all plant cells are green because they have chloroplasts inside them.I had trouble getting the cover sli ...

(1 pages) 1310 0 1.0 Mar/2006

Subjects: Science Essays > Biology

Cell transport

centration. Osmosis is very important for all cells; it is how cells obtain most of their water. In plant cells, osmosis can cause the cell to swell, the cell wall restricts its growth. This causes th ... , the cell wall restricts its growth. This causes the cell to become hard and rigid which makes the plant stand up tall.Facilitated diffusion is another method cells use to obtain things it needs. Fac ...

(2 pages) 11 0 3.0 Jun/2007

Subjects: Science Essays > Biology

Biology Definitions

Cellulose A straight chain polymer of glucose molecules secreted by plants and Used as structural supporting material.Cell wall A relatively rigid structure composed of ... ng material.Cell wall A relatively rigid structure composed of cellulose that encloses the Cells of plants. The cell wall gives these cells their shape and limits their Expansion in hypotonic media.Ch ... structures that has the general name plastid. Plastids Are membrane-bound organelles found only in plant cells. Usually plastids are Spherical bodies that float freely in the cytoplasm, holding pigme ...

(5 pages) 27 0 3.0 Oct/2001

Subjects: Science Essays > Biology

Biology

n pyruvic acid is metabolized using oxygen.Alcoholic fermentation- is a process that occurs in some plant cells and some unicellular organisms, such as yeast. Pyruvic acid is converted to ethyl alcoho ... glycolysis and fermentation.ATP synthetase- an enzyme that catalyzes the synthesis of ATP.Autotoph- plants and other organisms that meet their energy needs by building organic molecules from inorganic ...

(3 pages) 30 0 3.0 Jan/2002

Subjects: Science Essays > Chemistry

Genetic Engineering

f an organism's hereditary material in order to eliminate undesirable characteristics or to produce plants with more desirable characteristics. The splicing of genes takes place in order to combine tr ... t enables scientists to modify specific genes and move them from organisms as distinct as bacteria, plants, and animals. The actual splicing of genes into foreign genomes is very complex. "Many variet ...

(3 pages) 13 0 0.0 Feb/2002

Subjects: Science Essays > Biology

Untitled

f an organism s hereditary material in order to eliminate undesirable characteristics or to produce plants with more desirable characteristics. The splicing of genes takes place in order to combine tr ... t enables scientists to modify specific genes and move them from organisms as distinct as bacteria, plants, and animals. The actual splicing of genes into foreign genomes is very complex. Many varieti ...

(4 pages) 7 0 0.0 Feb/2008

Subjects: Science Essays > Biology

Super Food

Mar.2001). Bt is a natural product but this quality makes it easily removable from the surface of a plant. In the mid 1980?s scientists were able to isolate the gene in Bt that makes it poisonous to i ... solate the gene in Bt that makes it poisonous to insects but harmless to humans, and insert it into plant cells. By 1990 the first successful Bt plant, cotton, was produced (Wheelwright, Mar.2001). Af ...

(4 pages) 10 0 0.0 Feb/2008

Subjects: Science Essays > Biology

Testable Question Is it possible to observe diffusion across a

able membrane from a region of higher water concentration to a region of lower water concentration. Plant cells have a cell wall as well as a plasma membrane. The cell wall is a rigid structure that i ... ic pressure within the cell. With the loss of this osmotic pressure the supportive structure of the plant is lost and the plant becomes limp and shriveled. By adding particles such as Na and Cl, the o ...

(2 pages) 2173 0 0.0 Feb/2008

Subjects: Science Essays > Chemistry