Diversity of Living Organisms – Animal Kingdom Quiz - ICSE Class 11 Biology

Free practice quiz: Diversity of Living Organisms – Animal Kingdom (ICSE Class 11 Biology). 42 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which class of fish is characterized by a cartilaginous skeleton, a ventral mouth with replaceable teeth, and placoid scales?

   1. Osteichthyes
   2. Chondrichthyes
   3. Agnatha
   4. Cyclostomata
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   Answer: B. Chondrichthyes

   Chondrichthyes, which includes sharks, rays, and skates, possess a skeleton made entirely of cartilage. They also have placoid scales (dermal denticles), a ventral mouth, and gill slits lacking an operculum.

2. Which class of molluscs is characterized by a shell divided into two halves, hinged together, and a flattened body with a reduced head?

   1. Gastropoda
   2. Cephalopoda
   3. Bivalvia
   4. Polyplacophora
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   Answer: C. Bivalvia

   Bivalves, such as clams and oysters, have shells composed of two articulating valves and lack a distinct head and radula. They are also characterized by paired gills and a laterally compressed body.

3. Which of the following is a characteristic of the class Agnatha?

   1. Paired fins
   2. Jawless mouth
   3. Cartilaginous skeleton
   4. Gills covered by operculum
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   Answer: B. Jawless mouth

   Agnatha, meaning 'without jaws', represents the jawless fishes like lampreys and hagfish. They lack paired fins and jaws, and their gills are not covered by an operculum.

4. Animals exhibiting metamorphosis, with a larval stage that is morphologically and often ecologically distinct from the adult, are found in which of the following phyla?

   1. Porifera
   2. Cnidaria
   3. Mollusca
   4. All of the above
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   Answer: D. All of the above

   Metamorphosis is common across many invertebrate phyla. Porifera have various larval forms, Cnidaria have planula larvae, and Mollusca have trochophore and veliger larvae, all indicating significant changes from larval to adult stages.

5. Which class of mammals is characterized by the presence of a placental embryo and is the most diverse group, including humans?

   1. Monotremata
   2. Marsupialia
   3. Eutheria (Placentalia)
   4. Chondrichthyes
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   Answer: C. Eutheria (Placentalia)

   Eutherians, or placental mammals, are characterized by a long gestation period where the embryo develops within the uterus, nourished via a placenta. This group comprises the vast majority of mammal species.

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