7.4: Data Analysis and Discussion

Instructions

Discussion should be typed (double spaced, size 12 font and standard 1” margins). There are no specific length requirements for this discussion but be sure to address all the components in the prompt below. You will submit this discussion along with your plant observations for your completed lab report.

Prompt/Questions to Address

Write a discussion for this experiment which explores the adaptations and diversity of vascular seed plants. Provide specific examples from the activity to support your conclusions. Be sure to address each of the following in your discussion:

1. Characteristics and advantages of seeds. What structures were visible in your seed cross section? Describe the function of each labeled part (seed coat, embryo, and endosperm). How does the presence of a seed provide an evolutionary advantage compared to spore-based reproduction in non-seed plants (HINT: How do the features of a seed contribute to the plant’s ability to survive and disperse?).
2. Characteristics of gymnosperms. Why are gymnosperms commonly referred to as “naked-seed” plants? How does their method of seed production differ from that of angiosperms?
3. Characteristics of angiosperms. Compare the number and arrangement of sepals, petals, stamens, and carpels in the two flowers you dissected. What patterns or differences did you notice? How do the flower’s color, shape, and structure relate to the type of pollinator it might attract?
4. Evaluate the adaptations of land plants. Looking across nonvascular, seedless vascular, gymnosperm, and angiosperm plants, summarize the major evolutionary trends in plant reproduction and structural complexity.