Investigations in General Biology by Kenneth Armitage (Auth.)

By Kenneth Armitage (Auth.)

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Among the essential functions, the root is specialized for exchange; the leaf, for transforming energy and exchange, and the stem, for transport. Additionally, the FUNCTIONAL ORGANIZATION OF FLOWERING PLANTS 61 root and stem provide support and may serve as organs of storage of chemical energy, primarily in the form of starch. The discussion of the functions of root, stem, and leaf emphasizes another characteristic of biological systems: specialization. Specialization occurs at all levels of biological organization.

D. Does light affect the rate of oxygen utilization? How does temperature affect the rate of oxygen consumption? What substrate is the seedling utilizing? Do different kinds of seedlings respire at the same rate? 2. The mouse. Some of the same questions that were asked of the seedling may also be asked of the mouse. Some other questions are: a. Do different strains of mice respire at different rates? b. Does a well-fed mouse use the same substrate in respiration as a starved mouse? EXPERIMENTAL ANALYSIS: THE U S E OF CONTROLS 51 The work may be expanded to include other animals.

The 1% starch solution is made up in buffers so that each starch solution has a known pH. Arrange your solutions to conform to the following pattern: Tube number 1 (includes 2 duplicate) 3 4 5 5 5 5 5 5 ml ml ml ml ml of of of of of 1% 1% 1% 1% 1% starch starch starch starch starch solution, solution, solution, solution, solution, pH pH pH pH pH 4 6 7 8 10 Record the temperature at which the solutions are maintained. Frequently temperature is recorded as room temperature. Room temperature is assumed tobe21°-22°C.

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