Animal life cycles Knowledge-Based Practice

Questions

1. 1.

   In many animal species with complex life cycles, which ecological advantage is primarily provided by having distinct larval and adult stages?

   • A) It allows offspring to bypass vulnerable juvenile periods entirely.
   • B) It prevents environmental temperature fluctuations from affecting individual survival.
   • C) It eliminates the metabolic requirement of allocating energy toward reproductive maturity.
   • D) It reduces direct competition for food and habitat resources between juveniles and adults.
2. 2.

   Which statement correctly characterizes an animal life cycle that exhibits direct development?

   • A) The offspring emerges resembling a smaller form of the adult and grows without passing through a distinct larval stage.
   • B) The offspring undergoes a dormant pupal phase during which its juvenile tissues are systematically remodeled.
   • C) The offspring hatches as a free-living larva that occupies a completely different ecological niche before metamorphosis.
   • D) The offspring requires an aquatic intermediate nymph stage to gradually develop adult reproductive structures.
3. 3.

   Which statement correctly describes a major anatomical change that occurs as a frog tadpole transforms into an adult frog?

   • A) External gills develop to replace internal lungs as the organism moves to land.
   • B) The muscular tail elongates and develops rigid bones to support movement on land.
   • C) The intestinal tract elongates significantly to facilitate a shift from an animal-based diet to a fibrous plant-based diet.
   • D) Functional gills are resorbed while lungs develop to enable atmospheric gas exchange alongside the moist skin.
4. 4.

   Which statement correctly describes the nymph stage in an insect undergoing incomplete metamorphosis?

   • A) It is an inactive resting stage during which internal tissues are completely broken down and reorganized.
   • B) It hatches as a worm-like organism that feeds continuously before enclosing itself in a cocoon.
   • C) It resembles a smaller, wingless version of the adult and gradually develops adult features through successive molts.
   • D) It represents the fully mature, reproductive stage that immediately lays eggs without further growth.
5. 5.

   Which sequence correctly represents the stages of complete metamorphosis in an insect life cycle?

   • A) Egg → nymph → adult
   • B) Egg → pupa → larva → adult
   • C) Egg → larva → pupa → adult
   • D) Larva → nymph → pupa → adult

Answers and step-by-step solutions appear after you finish the test.