2 9. Which of the following arthropods is most closely related to a scorpion? (A

Question

2 9. Which of the following arthropods is most closely related to a scorpion? (A) centipede; (B) trilobite; (C) horseshoe crab; (D) butterfly; (E) crayfish. 10. Which of the following animal groups are carnivores? (A) Hydrozoa; (B) Asteroidea; (C) Cephalopoda; (D) A & B; (E) A,B &C; 11. Which of the following animals has a fluid-filled body cavity that is lined with peritoneum, which is derived from mesoderm? (A) earthworm; (B) roundworm; (C) flatworm; (D) A & B, (E) A,B & C. 12. What is an advantage for an animal in being ectothermal? (A) It allows an animal to remain active over a wider range of external temperatures. (B) It allows an animal to be distributed over a wider geographic area. (C) It requires an animal to consume less food. (D) It produces less water loss in the animal. (E) A & B 13. Which of the following is true of animals that have bilateral symmetry? (A) The body has anterior and posterior regions. (B) They are adapted for a sessile life. (C) There is only one plane that divides the body into mirror-image halves. (D) A & B (E) A & C 14. In the amniotic egg of reptiles and birds, nitrogenous wastes are stored in the: (A) allantois; (B) yolk sac; (C) chorion; (D) amnion; (E) body of the embryo. 15. Which of the following characteristic features of chordates is present in adult tunicates? (A) notochord; (B) pharyngeal slits; (C) dorsal, hollow nerve cord; (D)A&B; (E) A,B & C. 16. Which of the following animals live in an isoosmotic environment? (A) crayfish; (B) starfish; (C) tuna; (D) A&B; (E)A & C. 17. Cephalopods have a closed circulatory system because: (A) this is typical for mollusks and they inherited it from their molluscan ancestors (B) they are aquatic animals (C) it is necessary to maintain their high level of activity, which requires a high metabolic rate (D) A & B (E) A & C

Explanation / Answer

9. Horseshoe crabs are closely related to scorpion. Horseshoe crab remain unchanged from approximately 400 million years and one of the living fossil. The ancestor of scorpions were aquatic and crawled under the sea like horseshoe crabs.

10. Carnivorous animals mean the animals who are derived their nutrition from the animal flesh. In this question all three animal groups are carnivorous. Hydrozoa eat crustaceans, fish eggs etc. Asteroidea eat non insects arthropod. Cephalopoda eats other cephalopods, crustaceans, small fishes etc.

11. Fluid filled body cavity that is lined with peritoneum which is derived from mesoderm is called coelom. Earthworms having coelom,flatworm does not. Roundworm have the pseudocoelom.

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