Evolution

142 soru

Tüm türler142 Çoktan seçmeli76 Doğru / Yanlış14 Eşleştirme26 Sıralama26

In the evolutionary transition of plants from aquatic and moist habitats to dry land, which structural adaptation first enabled pteridophytes to overcome the height limitations of bryophytes by facilitating long-distance transport and mechanical support?

The differentiation of true vascular tissues containing lignified xylem and phloem

The development of non-vascular rhizoids for water absorption in bryophytes

The formation of naked seeds enclosed within protective floral ovaries in gymnosperms

The complete separation of fluids in a three-chambered internal transport organ

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Cevap: The differentiation of true vascular tissues containing lignified xylem and phloem

Cevap

The differentiation of true vascular tissues containing lignified xylem and phloem

The development of specialized conducting tissues (lignified xylem for water and mechanical strength, plus phloem for organic nutrients) represents the main evolutionary milestone that enabled pteridophytes and higher vascular plants to grow tall on land.

Adım Adım Çözüm

Analyze the evolutionary limitation of bryophytes (mosses and liverworts).

Bryophytes lack true vascular bundles and rely on simple diffusion across short distances, keeping them small and restricted to moist habitats.

Without specialized conducting cells, water transport is constrained by physical diffusion limits.

Identify the key evolutionary advance in pteridophytes (ferns).

Pteridophytes were the first plant group to develop true vascular tissues (xylem and phloem).

Lignified xylem vessels provide compressive strength for vertical support as well as efficient water transport over tall distances.

Anahtar Kavram

Evolution of plant vascular systems and land adaptation trends

Tahmini Süre:1m 0s

Soru 142Soru →

Following the mass extinction event at the end of the Cretaceous period, ancestral mammals underwent rapid diversification into diverse ecological roles, giving rise to burrowing, aquatic, flying, and terrestrial forms. Which of the following evolutionary processes best accounts for this rapid diversification into varied ecological niches?

Adaptive radiation driven by the availability of unoccupied ecological niches

Convergent evolution resulting in homologous structures across unrelated mammalian lineages

Inheritance of acquired traits resulting from mammals actively adapting to new habitats during their lifetime

Discontinuous variation caused by non-heritable environmental modifications in distinct ancestral groups

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Cevap: Adaptive radiation driven by the availability of unoccupied ecological niches

Cevap

Adaptive radiation driven by the availability of unoccupied ecological niches

The correct answer highlights adaptive radiation, which occurs when a single ancestral species rapidly evolves into a variety of forms adapted to specific ecological niches, especially after mass extinctions free up ecological space.

Adım Adım Çözüm

Identify the key evolutionary pattern described in the stem

A single ancestral mammalian lineage rapidly diverged into multiple specialized forms (flying, aquatic, burrowing) following a mass extinction event.

Mass extinctions clear ecological niches, creating opportunities for adaptive radiation.

Match the biological observation with the corresponding evolutionary mechanism

Diversification from one common ancestor into distinct morphological forms suited for different ecological niches defines adaptive radiation.

Natural selection acts on variations in the ancestral population as subgroups adapt to different ecological roles.

Anahtar Kavram

Adaptive Radiation and Mechanisms of Speciation

Tahmini Süre:1m 0s

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Evolution

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