Page 19 - Demo

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AGRICULTURE, CONTINUED
Plant Wars—Student Laboratory Kit
Which is more important—heredity or envi- ronment? Students investigate this age-old question using albino tobacco seeds from heterozygous parents—ones that should produce a ratio of three green for every one albino tobacco plant. Some seeds
are germinated in the light and others are germinated in the dark. Students must use their data to defend which is more import- ant: heredity or environment.
FB1563 I $33.45
Gibberellic Acid and Plants—
The Grass Won ̓t Grow—Student Laboratory Kit
Why does grass grow in one area and not another? In this activity, seeds are planted in two different environments, and the results of growth are compared using the scientific method. Students will define the problem, make observations, develop a hypothesis, design and conduct an experiment, analyze data and draw a conclusion. Complete for 30 students working in pairs.
FB1653 I $23.10
Student Laboratory Kit
What effects do hormones have on plants? Will different concentrations of hormones affect plants differently? Students place gibberellic acid solutions of varying concen- trations on bean seedlings and observe and record the exciting results. Students will also have the opportunity to design and conduct their own gibberellic acid experiments. Kit contains enough materials for 30 students working in pairs.
FB0478 I $107.75
Stomata and Transpiration
Rates—Student Laboratory Kit
First, students observe the physical proper- ties of stomata and determine the average number of stomata in a leaf by viewing plant leaf impressions under a microscope. Then they investigate and measure the rate of transpiration of plants under different condi- tions. Includes enough materials for
30 students working in pairs.
FB1861 I $73.50 Plants in the Spotlight—A Photosynthesis
Investigation—Student Laboratory Kit
This activity uses cooperation among lab groups as experiments are conducted to answer two important questions: Do plants prefer certain colors (wavelengths) of light for photosynthesis? How do environmental conditions affect the rate of photosyn- thesis? Using hornwort, student groups carry out experiments, such as changing the wavelengths of light, the temperature, light intensity and the concentration of a sodium bicarbonate solution. All class data are pooled, graphed and analyzed. For 30 students working in groups of three. Hornwort is available separately.
FB1780 I $24.10
FLINN SCIENTIFIC
I GROWING STEM WITH FLINN BIOLOGY 17