74. While sampling marine plankton in a lab, a student encounters large numbers of fertilized eggs. The student rears some of
the eggs in the laboratory for further study and finds that the blastopore becomes the mouth. The embryo develops into a
trochophore larva and eventually has a true coelom. These eggs probably belonged to a(n) ____.
(A) arthropod
(B) nematode
(C) echinoderm
(D) mollusk
(E) chordate
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統計: A(8), B(3), C(6), D(33), E(4) #939064
統計: A(8), B(3), C(6), D(33), E(4) #939064
詳解 (共 3 筆)
#6490488
(A) Arthropod(節肢動物)
✔️ 是原口動物(blastopore 形成口部)
✘ 不發育為 trochophore larva。
(B) Nematode(線蟲)
✘ 是偽體腔動物(pseudocoelomate)
✘ 沒有 trochophore larva。
(C) Echinoderm(棘皮動物)
✘ 是後口動物(blastopore 形成肛門)
✔️ 有真體腔,但✘沒有 trochophore larva。
(D) Mollusk(軟體動物) ✅
✔️ 原口動物
✔️ 有 trochophore larva 發育階段
✔️ 有真體腔
(E) Chordate(脊索動物)
✘ 是後口動物
✘ 沒有 trochophore larva。
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