Exam 28: The Evolution of Seed Plants

Which scenario described is not possible?

Which statement correctly describes the vasculature found in angiosperms and gymnosperms?

Pollen from a snapdragon flower lands on the stigma of a neighboring snapdragon.The pollen tube germinates and extends through the maternal sporophyte tissue to the ovule, where it encounters the female gametophyte and releases two sperm, one that fuses with the egg and another that fuses with the polar nuclei.Which statement about this scenario is true?

Which of the following structures is not part of the pistil?

Which two features found in seed plants play a clear role in preventing desiccation?

Refer to the figure. What is the name of the swollen base of the pistil? Identify its label.

A newly discovered fossil layer shows evidence that conifers and cycads flourished when the fossils were laid down.Below this layer there are no conifers or cycads.These fossils are most likely from the

A flower whose parts originate from a central point and appear as a mirror image across any diameter has _______ symmetry.

Describe how the evolution of seed plants changed Earth's landscape over the course of terrestrial colonization.What benefits seeds confer that seedless vascular plants did not have?

About 200 mya, dinosaurs were Earth's dominant animals, and _______ were the dominant vegetation.

Which structure forms the swollen basal part of the pistil that becomes the fruit?

Which of the following is not a major difference between monocots and eudicots?

The microgametophyte and the megagametophyte are

All seed plants can be classified as

Which of the following gymnosperms retain the ancestral trait of swimming sperm?

Despite the fact that only _______ produce true fruits, some conifers are known to produce fleshy rewards encasing their seeds.These tissues serve a similar purpose: to aid in seed dispersal by animal vectors.

You are sent to examine two adjacent farm fields with very similar soil types.Every year, one field is plowed before winter and allowed to sit bare until spring.The neighboring field is planted with a cover crop for winter.What difference would you most likely observe between the two fields?

Refer to the figure. Which term is least likely to be used when speaking of this flower?

Refer to the table. In 1879, W.J.Beal began an experiment that he could not hope to finish in his lifetime.He prepared 20 lots of seeds for long-term storage.Each lot consisted of 50 seeds from each of 23 species.He mixed each lot of seeds with sand and placed the mixture in an uncapped bottle, then buried all the bottles in a sandy knoll.At 5- or 10-year intervals over the next century, biologists excavated a bottle and checked the viability of its contents.The table shows the number of germinating seeds (of the original 50) from three of the species in years 50-100 of this ongoing experiment.Calculate the percentage of the seeds that were still viable for these three species in years 50-100, and graph percent viable seeds as a function of years after burial.

The evolution of pollen has enabled seed plants to thrive on Earth because it