The Iowa Science Teachers is sponsoring the following activities for science teachers of Iowa

Krohn, Milbert

University of Northern Iowa

Iowa Science Teachers Journal Volume 10 Number 1 Article 3 1972 Did You Know about Our Activity? Milbert Krohn Follow this and additional works at: https://scholarworks.uni.edu/istj  Part of the Science and Mathematics Education Commons Let us know how access to this document benefits you Copyright © Copyright 1972 by the Iowa Academy of Science Recommended Citation Krohn, Milbert (1972) "Did You Know about Our Activity?," Iowa Science Teachers Journal: Vol. 10 : No. 1 , Article 3. Available at: https://scholarworks.uni.edu/istj/vol10/iss1/3 This Article is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Iowa Science Teachers Journal by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. and allow it to set over night or longer. Now examine the stalks or stem. What changes have taken place? B. Next take a short piece of the stem and split it lengthwise (see page 140 of Life diagram 3 for more information on how to cut the stalk) and look at it under a dissecting stereoscope. Sketch one or two of the tubes that you split open. C. Now cut a very thin cross section of the stem and examine it under a compound micro-scope. (See diagram 2 on page 140 of Life.) Sketch and label the pattern of water tubes. D. Select a small piece of stem from a dicot (ask the instructor) and make a cross-section slide as you did with the celery and sketch and label the water tube pattern you see. (See figure 24.10 on page 335 of Modern Biology.) Fern Spore Case Lab Ferns are the only group of vascular plants that reproduce by spores. The others use seeds. You know, from past experience, that seeds are dispersed in many ways. Some seeds are carried by the wind like the milkweed. Birds carry poison ivy seeds, or seeds may be carried by water and animal's fur. The spores are very tiny and do not move except by the wind, water, and a "spring snapper." When the air is moist the spore cases which contain the spores, spring open. The edge of the spore case opens up and acts as a coiled spring to propel the spores out into the world. In this activity you will be looking at a fern leaflet and seeing the springed spore case and some spores. Look at the diagram on page 78 of WLT. A. From·an instructor, get a fern leaflet and examine it . Notice how the edges are curled up in some places . These still have the spore cases in t hem! Those that are open and fuzzy -9-on the back have already dispersed their spores . B. Take a clean slide and place the leaflet on it and smash part of it with your finger lnd you will notice little black granules which are the spore cases. Use a microscope to examine them. Sketch one of the spore cases and label the "spring." C. Next add water and a cover slip. Smash the cover slip down to force the spores out. Take a good look and have your slide checked by an instructor. Slide check ---------You may want to take a slide of spore cases and add water and heat them to see if you can make them snap open. These types of methods have proved to be effective in our particular educational setting. We believe that the added incentives, which are provided for the learner by such methods, have enhanced the interests and the achievement of students. Therefore, we would like to see this model implemented into more classrooms throughout the state of Iowa. DID YOU KNOW ABOUT OUR ACTIVITY? Milbert Krohn Past President 506 20th Street Spirit Lake, Iowa 51306 The Iowa Science Teachers is sponsoring the following activities for science teachers of Iowa. Inland Waters Seminar Earth Science Seminar Junior High Seminar. Fall Programs ... . Short Course .... . Iowa Academy Science Teaching Section SSMA National Meeting St. Louis NSTA Regional Junior Academy Field Days Bloody Run Okoboji Luther Camp Lake Okoboji Knoxville Oskaloosa Des Moines, !SEA Ames Gri nne 11 Des Moines 73 1972 Earth Science Aquatic Field Winter Field We are going to try to expand our program to include seminars in physics, chemistry and elementary science. We need teachers with ideas to join us in our effort to ge t science education moving. We will help supply the personnel for your idea. Get wi th us in our movement to place Iowa in the forefront of activity in science education. 2ND ANNUAL WORKSHOP ON INLAND WATERS SPAWNS PROJECT ON LITTLE SIOUX Milbert Krohn The second annual workshop on Inland Waters held at Lakeside Laboratory at Lake West Okoboji has ended . Participants have returned to their home schools and are now engaged in 

Did You Know about Our Activity?

https://scholarworks.uni.edu/cgi/viewcontent.cgi?article=2528&context=istj

Did You Know about Our Activity?

Abstract

Similar works

Full text

Available Versions

University of Northern Iowa