Surrounding the cell is the cell wall, which appears as relatively thick boundaries between the elodea cells. It can grow in aquariums, and it is an easy specimen to study under a microscope as an example of a plant cell. The first example is an animal cell and the second is a plant cell. The basic parts of the scientific process include the following. It is very used in aquarium vegetation and also in artificial pounds. In the center of the cell is a large vacuole used to store water and other molecules. Exemplar for internal achievement standard biology level 2 nzqa. Switch to high power magnification, 400x, and use the fine focus to bring the elodea cells into sharp focus. This lab was completed in class where students obtained their own cheek cells for observation and had a plant sample. Elodea is an freshwater, aquatic plant native to the americas commonly used in aquariums. Chloroplasts are a type of plastid, distinguished by their green color, the result of specialized chlorophyll pigments. It makes its own food from sunlight and carbon dioxide in the process known as photosynthesis. Homeostasis involves the maintenance of a stable set of conditions inside an organisms cells.
In this lab, you will view cells from your cheek animal cells and cells from elodea, which is a water plant. This online version will use photos of those cells instead. Plant cells maintain their normal size and shape in a low salt concentration solution. Elodea plants are sometimes referred to as waterweeds, or pond weeds. Describe the change in the elodea cell vacuole in relation to the leaf being placed in a hypotonic or hypertonic solution. Anthrax bacillus anthracis is one of the microorganisms used in biological warfare. Explain in terms of water potential the observations made when the elodea was placed in a salt solution when the elodea was placed in the salt solution, the vacuoles disappeared and the protoplasm came away from the cell wall making the organelles appear to be clumped in the middle of the cell. The cells are made up of many parts including a very thin membrane on the outer part of the cell. Plants profile for elodea canadensis canadian waterweed.
Often, harvesting and water level drawdown have only a transitory effect because of fast. Oct 01, 20 elodea is a water plant native to canada, often used in aquariums. Indicate on your drawing the movement of the chloroplasts in the cell fluid by marking the drawing with arrows. Software drawing cell biology, drawer expert, software drawing cell biology. Cell example animal cell plant cell elodea cell cheek cell onion cell think of two reasons why you might not have been able to see structures such as endoplasmic reticulum and ribosomes, even though the cells definitely had these structures. What are the biology diagrams required for the icse board exam both. Elodea cells when an elodea leaf is placed into a distilled.
A drawing is the result of a long period of observation at different depths of focus and at different magnifications. Experiments to determine the early labeled photosynthetic products in elodea canadensis show that after 2 seconds of exposure to nah14co3, 45% of the 14c incorporated is located in malate and aspartate. Mar 14, 20 describe the change in the elodea cell vacuole in relation to the leaf being placed in a hypotonic or hypertonic solution. It is a monocotyledon from the hydrocharitaceae family.
Use these young growing tips to demonstrate streaming protoplasm as well as osmosis, plasmolysis, and other cell studies. Remember that plant cells contain both a cell membrane and a cell wall. In this activity, you will use the scientific method of inquiry to perform a. Careful observation should reveal similarities and differences between the cells. When studying an elodea cell under a microscope, it is important to remember that the cell consists of two layers, yet only one of them can be in focus. Aug, 2011 the dynamic cell model kit from cell zone.
Short term it can be kept in a shallow tray covered with water. In this experiment, you will see chloroplasts moving in the elodea cells as they begin to photosynthesize. The stems of elodea plants can grow up to 2 feet long. Jun 10, 2016 software drawing cell biology, drawer expert, software drawing cell biology. Elodea plants are native to the new world, though a number of species have established themselves as invasive. Nuclei are typically very difficult to during this experiment. This plant may be known by one or more common names in different places, and some are listed above. Remember, starch is much too big to fit through the cell membrane. These are generally irregular in shape and are always flat. Chloroplasts are the organelles in a plant cell that contain the chlorophyll plants use to convert light into sugars.
In the elodea cell i observed the cell wall, cytoplasm and the nucleus. Reduce number of air bubbles trapped under cover slip by placing one edge of the cover slip on the slide and then letting the rest of the cover slip drop onto the slide. Drawing is a very important skill in biology and is considered a type of data collection because drawings help to record data from specimens. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Elodea leaf elodea, also known as elodea densa, egeria densa, anacharis densa or waterweed, is an aquatic plant in the family hydrocharitaceae. Equivalent amounts of organic acids and c3 cycle products are. Drawings can highlight the important features of a specimen. Elodea definition is any of a small american genus elodea of submerged aquatic monocotyledonous herbs. Molecular biology and overexpression of genes for accumulation and. Elodea is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803. You should see the chloroplasts moving in a circular pattern around the cell. More facts of an elodea they provide a useful habitat for small fish and crustaceans, but because they propagate by. Chloroplast, structure within the cells of plants and green algae that is the site of photosynthesis. The configuration of leaflets or thin leaves, which may be only two cell layers thick e.
Plasmolysis of elodea california state university, northridge. Prepare and examine one plant cell, unstained and stained, using the light microscope. Elodea lab with cytoplasmic streaming and plasmolysis. The student investigates elodea leaf cells through the preparation and viewing of a slide, records their observations in a biological drawing with an appropriate title and. Ask students to use what they have observed to answer the following questions. Just inside the cell wall, you may or may not be able to see the cell membrane. After 1520 minutes, reduce the light so that you may visualize the elodea cells. During plasmolysis, the cell membrane pulls away from the cell wall. Include all the usual conventions for making good biological drawings, including careful labeling.
Draw cells as they appear under the various powers of magnification. Restricted states will be shipped elodea canadensis, elodea najas, or chara, depending on availability. Using elodea in the lab science and plants for schools. Students know cells function similarly in all living organisms. Identify and label the major organelles of the elodea cell. Bromthymol blue is used as an indicator for the presence of co2 in solution. Bacteria cell structures are the smallest cells and the cell structures are very simple. The main difference in cell structure between an li and an elodea cell is that li is a bacteria and elodea is a plant. Plant cells elodea 400x 100x elodea description in the.
Elodea pondweed experiments on microscopes 4 schools. The pressure counteracting the water entering the cell is called turgor. Adaptations of an elodea structural adaptations watch this video of an elodea in an aquarium. It is also often used in biology labs on cell structure because it forms nice, large cells that are easily observed under the microscope. Observe the leaf at 40x and record your observations. In this activity, you will use the scientific method of inquiry to perform a laboratory experiment. This video demonstrates how the kit can be used to model a particular elodea cell viewed. Observation of plasmolysis when the leaf is flooded with 6%. Below are examples of two typical cells an animal cell and a plant cell. When the salt solution is added, the salt ions outside the cell membrane cause the water molecules to leave the cell through the cell membrane causing it to shrink into a blob in the centre of the cell wall. Phosphoglyceric acid and sugars account for 27% of the label during similar exposures.
Mitosis flip book mitosis flip book flipbook cell templates. Elodea can be kept living in an aquarium long term if anchored with gravel it should then begin to grow. What is the shape of cheek cells and how can you find out. This lab involves the qualitative measurement of the changes in carbon dioxide concentration associated with respiration and photosynthesis in the freshwater plant elodea. Try out a few different sprigs of elodea to see which one is bubbling best. Plasmolysis in elodea plant cells science netlinks. Photosynthesis in elodea canadensis michx plant physiology. Prepare a wet mount of an elodea leaf with tap water. Elodea canadensis canadian waterweed this plant can be weedy or invasive according to the authoritative sources noted below. In plants, choloroplasts occur in all green tissues. Elodea, genus of five or six species of submerged aquatic plants in the frogsbit family hydrocharitaceae, useful in aquariums and in laboratory demonstrations of cellular activities. Blades biological provide care information for both the pondweeds elodea and cabomba. Calculate the length of the cell and work out the scale that applies to your drawing. This brings more water into the cells and increases the pressure because the cell membrane pushes against the cell wall.
Egeria densa, egeria brasiliensis is the general name given to these underwater weeds that belong to the group of the angiosperms. Ensure that you have had your teacher give you feedback on your drawing skills and your size and scale calculation skills before. A plants cell structure is more complex and advanced, if that helps you out. Exemplar for internal achievement standard biology level 2. Students know the characteristics that distinguish plant cells from animal cells, including chloroplasts and cell walls. Draw one healthy elodea cell and label the cell wall, cytoplasm, vacuole, chloroplasts, and nucleus. Remember that each drawing must have a diameter of at least 3 inches.
You should be able to draw an average animal cell with 3 labels. Pass out the elodea images, rulers, and student pages, then lead students in the explorations on the student pages note that student answers will vary depending on the cell they choose and their measurement technique. Elodea elodea canadensis is a common plant that grows in fresh water ponds, lakes, and is often used in freshwater aquariums. Adaptations of an elodea by livia 6c by livia mammen on prezi. More facts of an elodea they provide a useful habitat for small fish and crustaceans, but because they propagate by breaking off. A plants cell structure is more complex and advanced, if. Carbon transfer through snails and elodea bromothymol blue btb is an indicator that turns yellow in the presence of carbon dioxide. An older name for this genus is anacharis, which serves. Its leaves are only two cells thick, making it possible to easily view those cells and their organelles.
Elodea leaf elodea, also known as elodea densa, egeria densa, anacharis. Label the parts of the cell complex drawing showing plant and animal cells, and protein synthesis cell labeling simple cell drawing and complex cells diagrams are compared. When an elodea leaf is placed into a distilled water solution, the cells are in a hypotonic solution as there is a higher water potential inside of the cell than its surroundings. Elodea is a good model to study living plant cells in action. Elodea is a genus of submerged aquatic plants used in aquariums. Cell biology drawing tools software elodea biological onion wall. Classified in the frogsbit family hydrocharitaceae, elodea is native to the americas and is also widely used as aquarium vegetation and laboratory demonstrations of cellular activities. Name two selectively permeable membranes that are present within the elodea cells.
Elodea unknown binding january 1, 1986 see all 2 formats and editions hide other formats and editions. Biological drawings may contain some errors in applying conventions or minor inaccuracies in representation. As a result, only part of constituent parts of the cell. Students with more experience can integrate this task directly into the work phase. Using forceps, remove a small leaf from the tip of an elodea plant and lay it flat in the drop of water. Elodea is a water plant native to canada, often used in aquariums. As students answer the questions, sketch an elodea plant cell on the board, filling in the cell with. Light setup describe the initial color of each test tube. The student investigates elodea leaf cells through the preparation and viewing of a slide, records their observations in a biological drawing with an appropriate title.
To do this, place a drop of water towards one end of the slide. Video explaining how to draw a biological diagram showing cell detail. Elodea plants are native to north and south america. Elodea high school inquiryscientific method plants. For the bonus question, the answer should be similar to this example.
Elodea canadensis an overview sciencedirect topics. Cell example animal cell plant cell elodea cell cheek cell onion cell think of two reasons why you might not have been able to see structures such as endoplasmic reticulum and ribosomes, even though the cells definitely. Which side of a penny will hold more drops of water before spilling over on to a paper towel. Shrinkage of the protoplast or cell contents due to water loss when a drop of salt water nacl is added to the elodea slide. Draw the appropriate arrows for water and the final result. This biological drawing skills handbook has been developed to support gce biology a. Put it in the middle of a slide with a drop of the water. This does not happen in low salt concentration because of the rigid cell wall. Draw a labeled diagram of the apparatus you will use in this experiment. The pictures below show the setup for an investigation during which bromthymol blue was added to all the test tubes. Elodea can be purchased from carolina biological supply. Elodea densa is an aquatic plant widely used in biology for observation of plant cells and for studies of photosynthesis.