Lab 9 - Meghan Wright Exercise 1: Which kind of tissue is responsible for the above observation? -the xylem and phloem tubes that transport fluids What are the functions of the following parts of a plant? : Stems: support for leaves, flowers and fruit, transport of fluids through xylem and phloem, storage of nutrients, and production of new living tissue Leaves: photosynthesis, transpiration, storage of food and water Buds: an embryonic shoot that will result in a flower or fruit Roots: absorption of water and inorganic nutrients, anchoring of the plant body to the ground and storage of food and nutrients Flowers: reproduction Fruit: aids in seed dispersal Seeds: covers the plant embryo What is the difference between transpiration and capillary action? -Transpiration is movement of water upwards out of the plant while capillary action is when water moves upward inside a plant. Which did you see in this experiment? -Capillary action; the water + stain moved up the stem Where is xylem and phloem tubes found in a tree? -The Bark Does transpiration occur when the tree drops its leaves in fall? -Yes In which tissue is the sap found? -Xylem cells Exercise 2: A 1. Diffusion describes the spread of particles through random motion from regions of higher concentration to regions of lower concentration; i.e. they spread out
2. Osmosis is the diffusion (or spreading) of water molecules across a semi-permeable membrane from a region of high concentration to a region of low concentration until a state of dynamic equilibrium is reached.
3. Osmosis is a type of diffusion in which equilibrium is reached, not all diffusions result in equilibrium of particles 4. Iodine is an indicator because it is used to bring out the contrast of something in order to show more detail. 5. Molecules tend to move from areas of high concentration to areas of low concentration. 6. 'Semi' or 'selectively permeable' means that only certain substances are allowed to move through it. B 1. Is the baggie or beaker more concentrated in starch? Baggie
2. Is the baggie or beaker more concentrated in iodine? Beaker
3. Iodine solution: is the baggie or the beaker hypertonic? Baggie
4. Starch solution: is the baggie or the beaker hypertonic? Beaker
5. Which one is hypotonic in relation to starch, baggie or beaker? Beaker C-Make Some Predictions 1. If the baggie was permeable to starch, which way would the starch move, into the bag or out of the bag? -Out of the bag 2. If the baggie was permeable to iodine, which way would the iodine move, into or out of the bag? -Into the bag 3. If the baggie was permeable to iodine, what color would you expect the solution in the baggie to turn? -yellow-ish What about the solution in the beaker? -Grey-ish 4. If the baggie was permeable to starch, what color would you expect the solution in the baggie to turn? -clear What about the solution in the beaker? Grey-ish 5. Make a prediction about what you think will happen: I think the iodine will mix with the solution inside the tubing and the starch in the tubing will mix with the iodine outside of it. D-Data Table
Starting Color
Color after 15 min
Solution in Beaker
Yellow
Yellow
Solution in Bag
White
Purple
E-Analysis 1. Based on your observations, which substance moved, the iodine or the starch? -Iodine
2. How did you determine this? -Only the solution in the baggie showed a reaction or change
3. Is the plastic baggie selectively permeable?-yes
4. Is the bag permeable to water? Why do you think so? -Yes, there was less water in the beaker and the baggie at the end of the experiment
5. Was there a net gain of water into the bag? Did you measure the contents of the bag in ml after the experiment? What was responsible for your observation? - No there was no gain of water in either the beaker or the baggies; I think the iodine and corn starch reacted to decrease the water in both.
Exercise 1:
Which kind of tissue is responsible for the above observation?
-the xylem and phloem tubes that transport fluids
What are the functions of the following parts of a plant? :
Stems: support for leaves, flowers and fruit, transport of fluids through xylem and phloem, storage of nutrients, and production of new living tissue
Leaves: photosynthesis, transpiration, storage of food and water
Buds: an embryonic shoot that will result in a flower or fruit
Roots: absorption of water and inorganic nutrients, anchoring of the plant body to the ground and storage of food and nutrients
Flowers: reproduction
Fruit: aids in seed dispersal
Seeds: covers the plant embryo
What is the difference between transpiration and capillary action?
-Transpiration is movement of water upwards out of the plant while capillary action is when water moves upward inside a plant.
Which did you see in this experiment?
-Capillary action; the water + stain moved up the stem
Where is xylem and phloem tubes found in a tree?
-The Bark
Does transpiration occur when the tree drops its leaves in fall?
-Yes
In which tissue is the sap found?
-Xylem cells
Exercise 2:
A
1. Diffusion describes the spread of particles through random motion from regions of higher concentration to regions of lower concentration; i.e. they spread out
2. Osmosis is the diffusion (or spreading) of water molecules across a semi-permeable membrane from a region of high concentration to a region of low concentration until a state of dynamic equilibrium is reached.
3. Osmosis is a type of diffusion in which equilibrium is reached, not all diffusions result in equilibrium of particles
4. Iodine is an indicator because it is used to bring out the contrast of something in order to show more detail.
5. Molecules tend to move from areas of high concentration to areas of low concentration.
6. 'Semi' or 'selectively permeable' means that only certain substances are allowed to move through it.
B
1. Is the baggie or beaker more concentrated in starch? Baggie
2. Is the baggie or beaker more concentrated in iodine? Beaker
3. Iodine solution: is the baggie or the beaker hypertonic? Baggie
4. Starch solution: is the baggie or the beaker hypertonic? Beaker
5. Which one is hypotonic in relation to starch, baggie or beaker? Beaker
C-Make Some Predictions
1. If the baggie was permeable to starch, which way would the starch move, into the bag or out of the bag? -Out of the bag
2. If the baggie was permeable to iodine, which way would the iodine move, into or out of the bag? -Into the bag
3. If the baggie was permeable to iodine, what color would you expect the solution in the baggie to turn? -yellow-ish
What about the solution in the beaker? -Grey-ish
4. If the baggie was permeable to starch, what color would you expect the solution in the baggie to turn? -clear
What about the solution in the beaker? Grey-ish
5. Make a prediction about what you think will happen:
I think the iodine will mix with the solution inside the tubing and the starch in the tubing will mix with the iodine outside of it.
D-Data Table
E-Analysis
1. Based on your observations, which substance moved, the iodine or the starch? -Iodine
2. How did you determine this? -Only the solution in the baggie showed a reaction or change
3. Is the plastic baggie selectively permeable? -yes
4. Is the bag permeable to water? Why do you think so? -Yes, there was less water in the beaker and the baggie at the end of the experiment
5. Was there a net gain of water into the bag? Did you measure the contents of the bag in ml after the experiment? What was responsible for your observation? - No there was no gain of water in either the beaker or the baggies; I think the iodine and corn starch reacted to decrease the water in both.