59 Comprehension check % is composed of Assume that the interior of an onion cel

Question

59 Comprehension check % is composed of Assume that the interior of an onion cell is 96% water molecules. The remaining 4 various dissolved particles. 1. The salt solution you applied to the slide is -% water molecules and " 2. Using the in solution, showing the direction of water movement. formation in question I, add an arrow to the picture you drew of the onion cells in saline ffusion/osmosis. 3. The process that occurred to the onion cells in salt solution was an example of di Explain your answer The onion cell membranes allowed cles to diffuse into the cells. 4. water to enter and leave the cells freely, but did not allow salt parti- This is an example of a 5. A student performed the onion cell experiment using human blood cells, When the student placed the blood cels in the salt water, they shriveled up and died. When the student placed other blood cells in distilled water, they filled up, exploded and died. What cellular structure present in onion cells, but not animal cells, prevented the leaf cells from shrivel- ing or exploding during your experiment? Self test 1. Of the cell organelles studied in this exercise, list three that are found in plant cells but not in animal cells. Reference: Bres and Weisshar. Thinking About Biology Laboratory Manual. 1998. Prentice Hall.

Explanation / Answer

1- 4% water and 96% Salt

2- direction of water movement will now be from inside of cell to outside because of low concentration of water in saline. it happens to maikntain equilibrium

3- it is an example of osmosis because onion cells only let water come outside and not the other particles from inside of cell

4- Selectively permeable membrane

5- because in salty solution the conc of salt was more in outside environment hence the cells gave out the water from semi permeable membrane , shrinked and died

in case 2, the solutes conc was higher in cell compared to outside environment, hence cells took up the water from outside sweelled and in lack of some control mechanism of uptake of water it finally bursted and died.

waxy coating of leaves which is gelatenous prevents water loss in levaes and also do not allow water uptake from outer environment

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