FIGURE 22–17 Pine Life Cycle In the life cycle of pine trees and other gymnosperms, the mature sporophyte trees produce male and female cones containing the gametophytes. Sequence Which sporophyte stage develops immediately after fertilization?
dReview List three adaptations of seed plants that allow them to reproduce without open water.
Apply Concepts Pollination is a process that occurs only in seed plants. What process in seedless plants is analogous to pollination?
Review Describe how fertilization takes place in a gymnosperm.
Classify Make a table with two columns—labeled haploid and diploid—and assign each of the following structures from the pine life cycle to the appropriate column: pollen tube, seed cone, embryo, ovule, seedling.
WRITE ABOUT SCIENCE
Design and write an advertisement promoting seeds. Your target audience, or customers, are seedless plants. Include information on how seeds will make their lives easier.