The lower epidermis of the elodea leaf has the largest cell.
When an elodea leaf is mounted on a 10 percent salt solution, the cells of the leaf will lose water through osmosis. This will cause the cells to shrink and the leaf to become flaccid. The high salt concentration outside the cells will create a hypertonic environment, leading to water moving out of the cells to try to balance the concentration of solutes.
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The Veins
The cuticle of a leaf is primarily made up of cells called epidermal cells. These cells are located on the outer layer of the leaf and secrete a waxy substance that forms the protective cuticle layer.
There are 4 layers to the typical leaf; the upper epidermis, palisade layer, spongy layer and lower epidermis. ref http://users.rcn.com/jkimball.ma.ultranet/Biology/Pages/L/Leaf.html
You have asked "how many cell layers are there in an Elodea cell". Obviously a cell cannot contain layers of cells so your original question is nonsense. What you should have asked is "how many cell layers are there in an Elodea leaf?". Read it again. Think about it. Think until it hurts then think some more. It's not my fault you can't see them. If you have as much trouble seeing what's there as you seem to have reading what you've written I'm not surprised. The way to see two layers of cells is to focus on one layer and then change the focus so that the other layer comes into view. To show there are two layers by continually altering the focus in ONE direction only you should be able to move through the sequence:- no layer in focus > one layer in focus > other layer in focus > no layer in focus
The hypothesis of an osmosis lab with an Elodea leaf could be that the Elodea leaf will lose water and shrink when placed in a hypertonic solution due to water moving out of the leaf cells by osmosis, causing the cells to become flaccid. Conversely, if the Elodea leaf is placed in a hypotonic solution, it may gain water, swell, and become turgid as water moves into the leaf cells via osmosis.
An Elodea leaf belongs in the domain Eukarya, as it is a complex, multicellular organism with cells that contain a true nucleus.
The human epithelial cells are thick and boxlike whereas elodea cells are thin and platelike. The cells of elodea are rigid and rectangular in shape.
Due to plasmolysis
The main parts of an Elodea leaf are the cuticle (protective outer layer), epidermis (outer layer of cells), palisade layer (primary site of photosynthesis), spongy mesophyll layer (site of gas exchange), and stomata (pores for gas exchange). The cuticle protects the leaf, the epidermis provides structure, the palisade layer helps in photosynthesis, the spongy mesophyll layer aids in gas exchange, and stomata regulate gas exchange.
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When an elodea leaf is mounted on a 10 percent salt solution, the cells of the leaf will lose water through osmosis. This will cause the cells to shrink and the leaf to become flaccid. The high salt concentration outside the cells will create a hypertonic environment, leading to water moving out of the cells to try to balance the concentration of solutes.
Elodea is an aquatic plant commonly known as waterweed. It belongs to the genus Elodea within the family Hydrocharitaceae. Elodea is often used in biology classrooms for studying plant cells and photosynthesis.
Elodea leaf cells have chloroplasts, which are responsible for photosynthesis, a process that converts light energy into chemical energy. This is a unique organelle not found in animal cells. The central vacuole in Elodea leaf cells helps maintain turgor pressure, providing rigidity to the cell and aiding in photosynthesis, another feature not typically found in animal cells.
When you deal with problems like this, you need to consider diffusion and osmosis. In this case, you would refer to diffusion, which is the movement of water across a membrane from high concentrations to low concentrations (to try to balance the concentrations). First consider what happens to the cells when you place the elodea leaf in the salt solution; the water in the cells tries to balance the high concentration of salt (sodium chloride) in the surrounding solution, so the water leaves the leaf, thus the cells shrink. Now when you put the elodea leaf into regular water again, there is a higher concentration of water in the surrounding environment compared to inside the leaf's cells, so in attempt to balance concentrations, water goes INTO the cells, thus the cells in the elodea leaf swell (expand).
Yes, the elodea leaf will likely swell up in 5% saline water due to osmosis. The higher concentration of salt outside the leaf will cause water to move into the leaf cells, leading to an increase in turgor pressure and swelling.