- The diagram to the left illustrates the life cycle of a pine tree, a common type of gymnosperm. - Beginning at the far left of the diagram, the mature sporophyte (the tree) is the dominant generation in the life cycle of gymnosperms. The sporophyte gives rise to the male and female gametophytes within male and female cones, respectively. The male cone, or pollen cone, contains hundreds of microsporangia held within sporophylls. Cells within microsporangia undergo meiosis to give rise to pollen grains, which are immature male gametophytes. - The female cone is made up of many scales, each with two ovules. Each ovule contains a single megaspore mother cell that will undergo meiosis to produce a haploid megaspore. The magaspore will grow and divide to become the mature female gametophyte with two to three eggs (typically only one is fertilized). - The pollen grain lands on the micropyle of the female cone scale and germinates. The pollen grain grows a pollen tube and eventually fertilizes the nucleus of the egg. The fertilized egg then develops into an embryo, which will develop into a tree.

Which statement regarding conifers is correct?

- The male gameteophytes arise from the microspores

Which of the following statements regarding gymnosperms is incorrect?

- Gymnosperms are flowering plants.

Pollen grains in pine trees

- contain the male gameteophytes.

11.6.3 Alternation of Generations: Gymnosperms Flashcards by Irina Soloshenko

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11.6.3 Alternation of Generations: Gymnosperms Flashcards

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