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Zorluk: ZorSpermatophytes: Gymnosperms and Angiosperms

During a botanical field survey, two seed-bearing plants, designated as Plant P and Plant Q, are analyzed for their structural and reproductive traits. Plant P displays ovules borne exposed on the surfaces of cone scales without carpels, while Plant Q displays ovules completely enclosed within an ovary wall. Which of the following statements correctly compares the reproductive and anatomical characteristics of these two plant groups?

  1. Plant P produces naked seeds relying on a pre-fertilization haploid female gametophyte for embryo nutrition, whereas Plant Q forms seeds enclosed within fruits following double fertilization.Cevap
  2. B
    Plant P encloses its developing seeds within a protective ovary wall that ripens into a true fruit, whereas Plant Q bears exposed naked seeds directly on megasporophylls.
  3. C
    Plant P uses phloem to conduct water and minerals upward to developing cones, whereas Plant Q uses xylem to translocate synthesized organic food down to the ovary.
  4. D
    Plant P belongs to a genus correctly written as pinus Caribaea, while Plant Q produces seeds containing a haploid endosperm formed after double fertilization.

Cevap

Plant P produces naked seeds relying on a pre-fertilization haploid female gametophyte for embryo nutrition, whereas Plant Q forms seeds enclosed within fruits following double fertilization.
The correct answer accurately distinguishes gymnosperms from angiosperms. Plant P is a gymnosperm, which produces naked seeds exposed on scales and utilizes a haploid female gametophyte as nutritive tissue formed prior to fertilization. Plant Q is an angiosperm, which encloses its ovules within an ovary that matures into a fruit, and relies on double fertilization to produce a triploid endosperm.

Adım Adım Çözüm

1
Identify the taxonomic divisions of Plant P and Plant Q based on ovule enclosure.
Plant P represents a gymnosperm (naked seed plant) because ovules are exposed on cone scales without a surrounding carpel. Plant Q represents an angiosperm (flowering plant) because ovules are enclosed within an ovary wall.
The defining morphological criterion separating gymnosperms from angiosperms is whether ovules/seeds are exposed on megasporophylls or enclosed within carpels.
2
Analyze the reproductive features and nutritive tissue origins of gymnosperms and angiosperms.
Gymnosperms develop a haploid (nn) nutritive tissue from the female gametophyte prior to fertilization. Angiosperms undergo double fertilization where one sperm nucleus fuses with the polar nuclei to yield a triploid (3n3n) endosperm, and the ovary wall matures into a protective fruit.
Double fertilization and true fruit development from an ovary wall are key innovations of angiosperms.
3
Evaluate the options to identify the statement that accurately reflects these differences.
The statement that describes Plant P as bearing naked seeds with haploid nutritive tissue and Plant Q as producing enclosed seeds inside fruits after double fertilization is correct.
This statement aligns precisely with gymnosperm and angiosperm anatomical and developmental definitions.

Anahtar Kavram

Structural and reproductive distinctions between gymnosperms and angiosperms
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Konular

Spermatophytes: Gymnosperms and Angiosperms

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