複選題16. 有關無脊椎動物的敘述，哪些正確？ (A)軟體動物的頭足綱，屬於開放式循環系統，不具血紅素 (B)海綿動物的各細胞之間並未有明顯的分工，各細胞可各自進行攝食、排泄等功能 (C)扁形動物呈現兩側對稱，是最早出現頭化現象的動物 (D)最早出現身體分節現象的是環節動物 (E)棘皮動物(如海星)的幼體為兩側對稱，而成體則演化為次生性的輻射對稱

複選題

16. 有關無脊椎動物的敘述，哪些正確？
(A)軟體動物的頭足綱，屬於開放式循環系統，不具血紅素
(B)海綿動物的各細胞之間並未有明顯的分工，各細胞可各自進行攝食、排泄等功能
(C)扁形動物呈現兩側對稱，是最早出現頭化現象的動物
(D)最早出現身體分節現象的是環節動物
(E)棘皮動物(如海星)的幼體為兩側對稱，而成體則演化為次生性的輻射對稱

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統計： A(2), B(2), C(4), D(4), E(4) #3834966

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B1 · 2026/10/20

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本題考查的核心觀念身體構造的複雜程度...

(共 1145 字，隱藏中）

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複選題17. Plant hormones (phytohormones) trigger significant physiological changes at extremely low concentrations. Their mechanism of action typically involves the binding of hormone molecules to specific receptors, which activates internal signal transduction pathways to regulate gene expression or enzymatic activity. Based on current understanding of plant hormone signaling, which of the following statements are correct? (A) Each hormone triggers a single, specific physiological response that remains consistent across all tissues and plant species. (B) The same hormone can produce different physiological outcomes depending on the tissue type, developmental stage, and receptor/signaling context. (C) Hormone action is strictly independent of dosage; the physiological outcome is determined only by the presence or absence of the signal. (D) Physiological outcomes are often the result of complex interactions—such as synergy or antagonism—between multiple hormone classes rather than a single isolated signal. (E) Plant hormones act only locally at the site of synthesis and are incapable of functioning as long-distance systemic signals through vascular tissues.

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