Question

seed plants evolved from a lineage of select answer. they rose to dominance as the climate became select answer.

which of the following is a haploid cell in seed plants that gives rise to a female gametophyte?

• ovule
• pollen sac

Explanation:

Analyze seed plant evolutionary origins

Using the Evolution of Land Plants and Seedless Vascular Plants knowledge points, we trace the ancestry of seed plants. Seed plants (spermatophytes) evolved from an ancestral lineage of heterosporous, seedless vascular plants, specifically closely related to progymnosperms or ancestral ferns. Thus, the first blank is filled by "seedless vascular plants" (or "ferns").

Analyze environmental drivers of seed plant dominance

During the Permian period, the global climate transitioned from warm and wet to much drier and cooler conditions. Seed plants, possessing drought-resistant adaptations like seeds and pollen, rose to dominance as the climate became "drier and colder" (or "drier").

Identify the haploid precursor of the female gametophyte

In seed plants, heterospory produces two types of spores: microspores and megaspores. A megaspore is a haploid cell that undergoes mitosis to develop into the multicellular female gametophyte (megagametophyte) inside the ovule.

Evaluate the given multiple-choice options

The visible options are "Ovule" and "Pollen sac". Neither of these is a single haploid cell; the ovule is a diploid megasporangium structure containing protective integuments, and the pollen sac is a microsporangium. The correct haploid cell that gives rise to the female gametophyte is a megaspore. Given the visible choices are cut off, we will provide the complete correct scientific terms for the fill-in-the-blanks and the multiple-choice question.

Answer:

Question 1

Seed plants evolved from a lineage of <blank>seedless vascular plants</blank>. They rose to dominance as the climate became <blank>drier and colder</blank>.

Question 2

Which of the following is a haploid cell in seed plants that gives rise to a female gametophyte?

• Megaspore (Correct answer)
• Ovule
• Pollen sac