Lab 10: Plants

Exercise 1: Plants and Functions

What kind of tissue????

  1. Stems
  2. Leaves
  3. Buds
  4. Roots
  5. Flowers
  6. Fruits
  7. Seeds

external image celery.gif
A. Epidermis
B. Sclerenchyma
C. Collenchyma
D. Parenchyma
E. Vascular Tissue

  1. Transpiration is essentially the lack of evaporation for plants much like sweating, and capillary action is when liquid is able to flow against the force of gravity. Liquid has the capability of rising in tight spaces such as a tube. We saw capillary action.
  2. There are both found throughout the plant particularly vascular tissue transporting water.
  3. Yes.

Sap is found in the vascular tissue: phloem to be specific.

Exercise 2: Osmosis and Diffusion



  1. Diffusion- when particles spread through motion from an area of a higher concentration to that of a lower one
  2. Osmosis- this is the process which allows particles to move through a selectively permeable layer to an area or higher concentration.
  3. The main difference between osmosis and diffusion is that one moves from higher to lower concentration while the other does the opposite.
  4. Iodine is called an indicator because it is used in experiments to show whether osmosis or diffusion is occurring.
  5. Molecules tend to move from areas of high concentration to areas of low concentration.
  6. Semipermeable means that it is permeable to some substances but not permeable to others, and selectively permeable means is function and feature of the semipermeable layer.
  1. The baggie is more concentrated in starch.
  2. The beaker is more concentrated in iodine.
  3. The beaker is the hypertonic solution for iodine.
  4. The baggie is the hypertonic solution for starch.
  5. The beaker is hypotonic for starch.
  1. The starch should move out of the baggie.
  2. The iodine should move into the baggie.
  3. I would expect the baggie to change to a diluted yellowish brown and be rather cloudy. The solution in the beaker should take on a faded yellowish brown color.
  4. I would expect the baggie to change to a much less cloudy white color. The solution in the beaker would take on a murky yellowish brown color.
  5. I think the bag will be permeable to iodine since starch is to thick of a substance to eek through.

Starting Color
Color After 15 Minutes
Solution in Beaker (Iodoine & Water)
yellowish brown
lighter yellow
Solution in Bag (Starch & Water)
Cloudy, murky white
dark brown accumulated
  1. The iodine moved from the beaker into the baggie.
  2. I saw the large area of dark brownish black gathered in the tube and not the beaker.
  3. Yes.
  4. I would say yes because it is allowed to pass freely between the two, and I think that the baggie had more water in it than when it started.
  5. I think there was because the water is the solvent and it binds to the solute and goes through the selectively permeable layer.