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Biology
Chapter 8 – Osmosis pages 195 - 198
1. Define Osmosis
2. In the box, draw a square. Is this square
large or small? How do you know? The truth
is , that without another square, you cannot
say whether or not the square is large or small.
3. Draw two circles, making one larger than the other.
Now that there are two objects, you have something to compare to / or contrast against. The word is
called “relative” and can be used when talking about size (smaller than or larger than), position (to the left
of or to the right of), temperature (warmer than or colder than), and concentration (more than or less
than).
4. Do you already know the meanings of these prefixes? Use your background knowledge or page
196 to help you.
a. hypob. hyperc. iso5. In this box, draw an arc to represent a plasma membrane. Then, place several “x” marks on one
side of the line. Place even more “x” marks on the other side of the line. Based on the number of
“x” marks, label one side as hypotonic and the other side as hypertonic.
What would you call each
side if the number of “x”
marks on each side of the line
were the same?
6. Which side, the hypotonic or the hypertonic, has more molecules of water? ____________ So
which direction does the water move? Water moves from the ___________ side to the
_____________ side.
7. Draw figures 8.2, 8.3, 8.4
Condition
Movement of water
molecules
Picture of red blood cell
Picture of Plant Cell
8. Real life situations: For letters A & C draw a picture showing the movement of water and the
hyper/hypotonic solutions of the cells and their environments. Your drawings should show one
where water is leaving cells and one where water is entering cells.
a. Freshwater fish have more solute in their cells, so water is constantly moving _______
absorbs
contractile
vacuole
contracts
drinking
hypertonic
hypotonic
moving into
moving out of
passive
transport
peeing
plasmolysis
turgor pressure
wilt
Words may be
used more than
1x. Bank
applies to #6 &
8.
them. The fish gets rid of the extra water by __________ more often. Conversely,
saltwater fish has less solute in their cells, so water is constantly ___________ them. The
fish prevent dehydration by ________________ more.
b. Paramecia are unicellular organisms that live, like freshwater fish, in a hypotonic
environment. To get rid of the extra water, paramecia use an organelle called a
_______________ _____________. This organelle ___________ water, then
_____________ to push the water out of the paramecia’s bodies. Since this action requires
energy, it is not a form of __________ __________.
c. Plants that have access to water have a high __________ __________. This is the pressure
caused by ____________________________________________________. Plants that
are in a drier environment, and do not have an adaptation for preventing water loss, will
probably w____. This condition is due to ______________, which is caused by
__________________________________.
9. If excess fertilizer is placed around the root of a tomato plant, the leaves of the plant will shrivel
and turn brown. All of the statements help explain why EXCEPT. As you pick your answer, draw
a picture of the statement and state whether true or false.
a. The fertilizer makes the soil solution hypotonic to the root cells.
b. The water moves out of the root cells by osmosis into the soil.
c. The plants roots are in a hypertonic solution.
d. Water is moving from an area of high water concentration to low water