Day 6

How do the processes of diffusion and osmosis impact the environment?

 Objectives:

 Apply knowledge of cellular transport to diffusion in the environment.

Texas and National Standards

1A,B;2A,B,C,D; 3A,C,E;11C;12E

Materials:

Lab procedure hand-out

Onion or Elodea

Lugol’s Iodine

15% salt solution

Glass slides

Coverslips

Compound microscopes

PowerPoint presentation – “Superfund Sites in Texas”

Transparency of  Some Interesting Comparisons  on understanding parts per million.

Quiz on drinking water components

Nine clear plastic cups

Food coloring

Activities:

1. Students will make observations of plasmolysis in cells (the effect of a hypertonic solution on cells).
2. Teacher will briefly introduce the Superfund sites in Harris County and surrounding area. PowerPoint presentation, “Superfund Sites in Texas”
3. Teacher demonstration to assist students in uncovering the meaning of “parts per million” and “parts per billion”. (Handout and transparency)