Which of the following has a gut with two openings, a mouth, and an anus? a. cni

Question

Which of the following has a gut with two openings, a mouth, and an anus? a. cnidarians b. annelids c. flatworms d. sponges e. placozoans Cnidarians do NOT have a. tentacles equipped with nematocysts. b. three germ layers. c. radial symmetry. d. a saclike gut. e. medusa stages. Nematocysts are used for a. reproduction b. excretion. c. muscle action. d. circulation. e. defense. Which of the following statements is NOT true? a. Mammals are vertebrates. b. Invertebrates have no backbone. c. There are more vertebrates species than invertebrates. d. The phylogenetic tree of animals begins with the sponges. e. There are more species of arthropods than species in any other animals phylum. All animals are a. multicellular, heterotrophic, and diploid. b. multicellular, heterotrophic, and haploid. c. multicellular, autotrophic, and diploid. d. unicellular, autotrophic, and haploid. The second greatest number of named species in an animals phylum is found in a. nematodes. b. mollusks. c. Platyhelminthes. d. echinoderms e. cnidarians. Cephalopods are the only mollusks that possess a. a mantle b. gills c. a closed circulatory system. d. shells. e. a closed circulatory system and shells. Nephridia are a. circulatory organs. b. respiratory organs. c. excretory organs. d. endocrine organs. e. part of the nervous system. Which of the following is mismatched? a. cnidarians: nematocysts b. sponges: spicules c. flatworms: bilateral symmetry d. echinoderms: protostomes e. annelids: segmented body Nematocysts are found only in a. cnidarians. b. nematodes. c. crustaceans. d. echinoderms. e. sponges. Which of the following groups does NOT have either epithelial or connective tissues? a. nematodes b. sponges c. echinoderms d. flatworms e. cnidarians Unlike many other animals, sponges lack a. a digestive tract, b. a symmetrical body plan. c. nerve cells. d. larvae. e. all of these EXCEPT "larvae." A digestive tract is complete if it a. possesses specialized regions for different digestive tasks. b. produces acids and contains enzymes. c. is a one-way tube with a mouth and an anus. d. is surrounded by muscle. e. uses the same opening for ingestion and egestion. Which of the following is NOT a protostomes group? a. mollusks b. flatworms c. echinoderms d. roundworms e. arthropods

Explanation / Answer

Answer 24:B-Annelids example-Earthworm.

25:B-Cnidarians donot have three germ layers as they produce only two germ layers (the ectoderm and the endoderm) making them diploblastic .

26.E-They are used for defense .Nematocytes inject toxins to immobalize prey ,some other nematocytes serve to entangle and hold onto the entangled meal by wrapping around it.

27.C-incorrect because compared to invertebrates there are not that many species of vertebrates but they are larger than invertebrates and need more space to live.

28.A-All animals are multicellular,heterotropic and diploid.

29.B-mollusks.They include snails ,calms,slugs etc.

30.C-closed circulatory system.

31.C-excretory organs ,they remove metabolic wastes from an animal body.

32.C-ectinoderms,protostomes.

33.A-Cnidarians that include corals,jellyfish and sea anemones.

34.A-possess specialised regions for different digestive tasks.

35.E-all the above expect larvae.

36.C-ectinoderm

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.