Students Manual of Exercises in Elementary Biology

Cover Students Manual of Exercises in Elementary Biology
Students Manual of Exercises in Elementary Biology
Benjamin C Benjamin Charles Gruenberg
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3. Try to tell how bending is brought about in the stem of the plant ?
4. How are changes in position brought about in the leafstalk ?
5. Do all plants behave the same way with relation to light?
6. Of what use to the plant is the reaction of light?
[43] EXERCISE 39 We learned that air is a mixture of several odorless, tasteless, colorless gases, of different specific gravities. Instead of forming layers with the heaviest at the bottom and the lightest at the top, gases in contact spread throug
...h each other in all directions, or diffuse.
Problem. How readily can gases spread and mix (diffuse) ?
What to use. Several volatile substances with distinct odors for example, carbon bisulfid, perfume, chloroform, ether, alcohol, acetic acid.
What to do. Open a bottle of one of the substances in the middle of the room ; as soon as pupils in the farthest parts of the room detect the odor, make a note of the time. Repeat with each of the other substances.
Record. Make a table showing the time required for each of the gases to diffuse a given distance.


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