# Does the initial uptake of water by seeds depend on temperature?

One way to answer this question is Show more Does the initial uptake of water by seeds depend on temperature? One way to answer this question is to soak seeds in water at different temperatures and measure the rate of water uptake at each temperature. The collected data can be used to calculate the temperature coefficient Q10 the factor by which a physiological process or reaction rate increases when the temperature is raised by 10C: where t2 = higher temperature (C) t1 = lower temperature k2 = reaction rate at t2 and k1 = reaction rate at t1. (Note that if t2t1 = 10 as in this exercise the math is simplified.) Q10 values may be used to make inferences about the physiological process under investigation. Chemical (metabolic) processes involving large-scale protein shape changes are highly dependent on temperature and have higher Q10 values closer to 2 or 3. In contrast many but not all physical parameters are relatively independent of temperature and have Q10 values closer to 1. For example theQ10 of the change in the viscosity of water is 1.21.3. In this exercise you will calculate Q10 using data for radish seeds (Raphanus sativus) to assess whether the initial uptake of water by seeds is more likely to be a physical or a chemical process. Samples of radish seeds were weighed and placed in water at four different temperatures. After 30 minutes the seeds were removed blotted dry and reweighed. The researchers then calculated the percent increase in mass due to water uptake for each sample. Their data are shown in the table. (Figure 1) Question: Calculate Q10 for water uptake by radish seeds for each 10C increase in temperature and then calculate the average Q10. Enter your answers to two decimal places. Show less

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