Chapter 3, Problem 1TC

Summary Introduction

(a)

To determine: How to test the hypothesis that seeds of temperate plants contain unsaturated fatty acids, while the seeds of tropical plants contain saturated fatty acids.

Explanation of Solution

To test the hypothesis, take two seeds; one from tropical plant and one from temperate plant. These seeds are kept in temperature below and above freezing points for a period of time. Then, these seeds are tested for their survival rates. Temperate seeds show high survival rates due to the presence of unsaturated fatty acids in them.

Summary Introduction

(b)

To determine: An explanation assuming that the hypothesis is supported.

Explanation of Solution

Unsaturated fatty acids in the seeds of temperate plants prevent the seeds from freezing under cold temperature as temperate regions have very cold winters. This might be an adaptation to survive in the environment. The unsaturated fatty acids have double bonds in their structure that prevent freezing or tight packaging of molecules.

Conclusion

Seeds of plants in temperate regions are adapted such that they could survive in cold environments. Presence of unsaturated fatty acids in their seeds is one such adaptation.