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1. Which class has the largest number of animals?
A. Fishes
B. Reptiles
C. Insects
D. Mammals
ANSWER: C.Insects
SOLUTION :Insects form the largest class of animals in the phylum Arthropoda. Arthropoda is the largest phylum of animals within which, the class Insecta has the maximum number of species.
2. Identify the characteristic of acoelomates ____________.
A. Absence of mesoderm
B. Absence of brain
C. Coelom that is incompletely lined with a mesoderm
D. Solid body without a cavity surrounding internal organs
ANSWER: D.Solid body without a cavity surrounding internal organs
SOLUTION:So, the correct option is ‘a solid body without a cavity surrounding internal organs’.
3. Salamander belongs to the class ___________.
A. Pisces
B. Aves
C. Reptiles
D. Amphibian
ANSWER :D.Amphibian
SOLUTION:Amphibians are ectothermic, anamniotic, four-limbed vertebrate animals that constitute the class Amphibia. In its broadest sense, it is a paraphyletic group encompassing all tetrapods, excluding the amniotes.
4. Which of the following combinations is incorrect?
A. Nematoda- roundworms, pseudocoelomate
B. Calcarea- gastrovascular cavity, coelom present
C. Echinodermata- coelom present, bilateral symmetry
D. Platyhelminthes- gastrovascular cavity, flatworms, acoelomate
ANSWER: B.Calcarea- gastrovascular cavity, coelom present
SOLUTION:Calcarea- gastrovascular cavity, coelom present
5. Flame cells are the excretory structures for ______.
A. Annelida
B. Coelenterates
C. Platyhelminthes
D. Echinodermata
ANSWER: C. Platyhelminthes
SOLUTION:Flame cell/solenocytes are the main excretory structures of Platyhelminthes
6. Phylum Porifera is classified based on ________.
A. Branching
B. Symmetry
C. Spicules
D. Reproduction
ANSWER: C.Spicules
SOLUTION: Porifera is the phylum composed of the sponges. They lack true tissues, have no body symmetry, and are sessile. The classification of phylum Porifera is based upon the presence and composition of spicules.
7. The canal system in sponges develops due to ______.
A. Porous walls
B. Gastrovascular system
C. Reproduction
D. Folding of inner walls
ANSWER: D.Folding of inner walls
SOLUTION: In sponges, canal system develops due to. Gastrovascular system. Folding of inner walls.
8. Ascaris is characterized by _______.
A. Presence of true coelom and metamerism
B. Presence of true coelom but the absence of metamerism
C. Absence of true coelom and metamerism
D. Absence of true coelom but the presence of metamerism
ANSWER: C.Absence of true coelom and metamerism
SOLUTION:Absence of true coelom and metamerism
9. Cnidaria is characterized by __________.
A. Tissue level of organization
B. Nematoblasts
C. Coelenteron
D. All
ANSWER: D.All
SOLUTION: Cnidarians have a real coelom or coelenteron. Their specialized stinging structures or nematocysts/nematoblasts assist in the defence. At the tissue level of organization, Cnidarians are said to be the simplest organisms; their cells are organized into true tissues.
10. Which of the following characters is not typical to class Mammalia?
A. Alveolar lungs
B. Seven cervical vertebrae
C. Thecodont dentition
D. Ten pairs of cranial nerves
ANSWER: D. Ten pairs of cranial nerves
SOLUTION:Ten pairs of cranial nerves.