The diploid generation of plants is called the ____________.

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First, let's restate the question and the choices to ensure clarity: The diploid generation of plants is called the ____________. Options: egg or sperm; sporophyte; gametophyte; gamete; spore.
Option 1: egg or sperm. These are haploid reproductive cells (gametes) that fuse during fertilization to form a diploid zygote. However, they themselves are not the diploid generation; they are the haploid stage that leads to the diploid stage. So this is not the correct term for the diploid generation.
Option 2: sporophyte. The sporophyte is the diploid phase in the plant life cycle that produces spores by meiosis. This generation is diploid and gives rise to the next generation of spores through meiosis, fitting the description of the diploid generation.
Option 3: gametophyte. The gametophyte is the haploid phase that produces gametes (sperm and eggs) by mitosis. This is the opposite of the diploid generation, so it is incorrect for the diploid stage.
Option 4: gamete. A gamete is a haploid reproductive cell (egg or sperm). Since gametes carry half the chromosome number, this term does not describe the diploid generation.
Option 5: spore. Spores are usually haploid and give rise to the gametophyte in many plant life cycles. While spores are involved in the life cycle, they themselves are not the diploid generation, so this option does not describe the diploid phase.
In summary, the options split between terms that describe haploid stages (gametophyte, gamete, spore) and the one that accurately names the diploid stage (sporophyte). The logic hinges on recognizing that diploidy refers to two sets of chromosomes, which is characteristic of the sporophyte generation in plants, whereas the haploid phases have one set.
Additionally, understanding alternation of generations helps: the sporophyte (diploid) produces haploid spores via meiosis, which then grow into the gametophyte (haploid), and the gametophyte produces gametes (haploid) that fuse to form a new diploid sporophyte. This cycle reinforces why sporophyte is the correct descriptor for the diploid generation, while the other terms correspond to haploid components of the life cycle.

BIOL 312 BIOL 312 - Exam 3

The diploid generation of plants is called the ____________.

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