1. What is the process of metamorphosis in amphibians?
a) Complete change
b) Partial change
c) Gradual change
d) No change
Answer: b) Partial change
Explanation: In amphibians, metamorphosis is a process of partial change, where they undergo changes from larvae (such as tadpoles) to adults (such as frogs).
2. Which of the following is NOT a characteristic of complete metamorphosis in insects?
a) Egg
b) Larva
c) Pupa
d) Juvenile
Answer: d) Juvenile
Explanation: In complete metamorphosis, the stages are egg, larva, pupa, and adult. Juvenile is not a specific stage in complete metamorphosis.
3. In which stage of amphibian metamorphosis do the lungs develop?
a) Tadpole
b) Froglet
c) Adult frog
d) Egg
Answer: b) Froglet
Explanation: The froglet is the stage between the tadpole and adult frog, during which the lungs develop to allow breathing on land.
4. Which hormone regulates metamorphosis in amphibians?
a) Thyroxine
b) Prolactin
c) Estrogen
d) Cortisol
Answer: a) Thyroxine
Explanation: Thyroxine plays a major role in the metamorphosis of amphibians by triggering the developmental changes from larvae to adult.
5. In insects, which of the following is the pupal stage associated with?
a) Metamorphosis
b) Feeding
c) Egg hatching
d) Growth
Answer: a) Metamorphosis
Explanation: The pupal stage in insects is part of complete metamorphosis and is a phase of transition where the insect changes from larva to adult.
6. Which stage of amphibian development involves the loss of gills and the appearance of limbs?
a) Egg
b) Tadpole
c) Froglet
d) Adult
Answer: c) Froglet
Explanation: The froglet is the stage where amphibians undergo major physical changes such as the loss of gills and the development of limbs.
7. The pupa of an insect is also known as:
a) Larva
b) Nymph
c) Chrysalis
d) Cocoon
Answer: c) Chrysalis
Explanation: The pupa stage is also referred to as the chrysalis, particularly in butterflies, where it undergoes transformation into the adult form.
8. Which of the following is an example of an insect that undergoes incomplete metamorphosis?
a) Butterfly
b) Moth
c) Grasshopper
d) Housefly
Answer: c) Grasshopper
Explanation: Grasshoppers undergo incomplete metamorphosis, which includes the egg, nymph, and adult stages without a pupal stage.
9. The complete metamorphosis of insects consists of how many stages?
a) 3
b) 4
c) 5
d) 6
Answer: b) 4
Explanation: Incomplete metamorphosis consists of 3 stages (egg, nymph, and adult), while complete metamorphosis involves 4 stages: egg, larva, pupa, and adult.
10. In the life cycle of amphibians, what follows the tadpole stage?
a) Egg
b) Froglet
c) Adult
d) Larva
Answer: b) Froglet
Explanation: After the tadpole stage, amphibians become froglets before fully transitioning into adult frogs.
11. What structure is used by insects to undergo complete metamorphosis?
a) Cocoon
b) Chrysalis
c) Molt
d) Exoskeleton
Answer: b) Chrysalis
Explanation: Insects that undergo complete metamorphosis form a chrysalis during the pupal stage where they transition to the adult form.
12. Which of the following animals undergoes complete metamorphosis?
a) Grasshopper
b) Dragonfly
c) Praying mantis
d) Butterfly
Answer: d) Butterfly
Explanation: Butterflies undergo complete metamorphosis, which includes the egg, larva (caterpillar), pupa (chrysalis), and adult stages.
13. What is the primary role of the pupa stage in insects?
a) Growth
b) Feeding
c) Reproduction
d) Transformation
Answer: d) Transformation
Explanation: The pupa stage is primarily for transformation, where the insect undergoes significant changes to become an adult.
14. What is the developmental form of an amphibian before it becomes a froglet?
a) Embryo
b) Tadpole
c) Adult
d) Juvenile
Answer: b) Tadpole
Explanation: Tadpoles are the early aquatic form of amphibians that undergo metamorphosis to become adult frogs.
15. Which of the following insects exhibits incomplete metamorphosis?
a) Dragonfly
b) Grasshopper
c) Termite
d) All of the above
Answer: d) All of the above
Explanation: All of these insects undergo incomplete metamorphosis, where they develop through egg, nymph, and adult stages.
16. How do amphibians breathe in the tadpole stage?
a) Lungs
b) Gills
c) Skin
d) Trachea
Answer: b) Gills
Explanation: Tadpoles primarily use gills for respiration in the aquatic environment before developing lungs during metamorphosis.
17. What is the primary advantage of complete metamorphosis in insects?
a) Faster development
b) Different niches for larvae and adults
c) Reduced competition
d) Increased feeding time
Answer: b) Different niches for larvae and adults
Explanation: Complete metamorphosis allows the larvae and adults to occupy different ecological niches, reducing competition for resources.
18. What happens during the pupal stage of metamorphosis?
a) Larvae continue to feed
b) Insect undergoes significant changes to become adult
c) Eggs are laid
d) Insects die
Answer: b) Insect undergoes significant changes to become adult
Explanation: During the pupal stage, the insect undergoes dramatic changes to develop into its adult form.
19. Which of the following is true about amphibian metamorphosis?
a) It occurs rapidly
b) It includes a major transformation from aquatic to terrestrial life
c) It involves the development of wings
d) It occurs during a single stage
Answer: b) It includes a major transformation from aquatic to terrestrial life
Explanation: Amphibian metamorphosis involves a transition from aquatic larvae (tadpoles) to terrestrial adults (frogs) with changes like the development of limbs and lungs.
20. In insects that undergo incomplete metamorphosis, how does the nymph differ from the adult?
a) Nymph has wings
b) Nymph has no wings and looks similar to the adult
c) Nymph is not active
d) Nymph undergoes pupation
Answer: b) Nymph has no wings and looks similar to the adult
Explanation: In incomplete metamorphosis, the nymph resembles the adult but lacks wings and matures through a series of molts.
21. How do hormones influence metamorphosis in amphibians?
a) By causing physical change
b) By controlling behavior
c) By regulating reproductive cycles
d) By controlling temperature
Answer: a) By causing physical change
Explanation: Hormones, such as thyroxine, regulate the physical changes that occur during amphibian metamorphosis.
22. In which stage of insect metamorphosis do wings first appear?
a) Egg
b) Larva
c) Pupa
d) Adult
Answer: d) Adult
Explanation: Wings develop during the adult stage of insects that undergo complete metamorphosis, like butterflies and beetles.
23. What is the function of the pupa stage in insect metamorphosis?
a) Feeding and growth
b) Flying
c) Sexual reproduction
d) Transformation into adult form
Answer: d) Transformation into adult form
Explanation: The pupa is a resting stage where the insect transforms from the larval form into its adult form, such as a butterfly.
24. Which of the following does NOT occur during amphibian metamorphosis?
a) Development of gills
b) Development of lungs
c) Development of limbs
d) Change in body structure
Answer: a) Development of gills
Explanation: Amphibians lose their gills during metamorphosis and develop lungs for breathing on land.
25. In the life cycle of a butterfly, which stage is equivalent to the pupa in other insects?
a) Caterpillar
b) Chrysalis
c) Egg
d) Adult butterfly
Answer: b) Chrysalis
Explanation: The chrysalis is the pupal stage in the butterfly’s life cycle, where it undergoes metamorphosis into an adult.
26. What type of metamorphosis do grasshoppers undergo?
a) Complete metamorphosis
b) Incomplete metamorphosis
c) Both complete and incomplete
d) None of the above
Answer: b) Incomplete metamorphosis
Explanation: Grasshoppers undergo incomplete metamorphosis, which consists of the egg, nymph, and adult stages.
27. What happens to an insect during the larval stage?
a) It develops wings
b) It feeds and grows
c) It becomes dormant
d) It mates
Answer: b) It feeds and grows
Explanation: During the larval stage, insects feed and grow, preparing for the next stage of transformation into the pupa.
28. Which factor influences the rate of metamorphosis in amphibians?
a) Temperature
b) Hormonal changes
c) Diet
d) All of the above
Answer: d) All of the above
Explanation: Temperature, hormonal changes, and diet all play a role in the rate at which amphibians undergo metamorphosis.
29. What is the key difference between complete and incomplete metamorphosis?
a) The number of stages
b) The presence of wings
c) The appearance of larvae
d) The type of diet
Answer: a) The number of stages
Explanation: Complete metamorphosis involves 4 stages (egg, larva, pupa, adult), while incomplete metamorphosis only has 3 stages (egg, nymph, adult).
30. Which stage in insect metamorphosis is most crucial for the insect’s physical transformation?
a) Larval stage
b) Nymph stage
c) Pupal stage
d) Egg stage
Answer: c) Pupal stage
Explanation: The pupal stage is where the insect undergoes major changes in its body structure, transforming into its adult form.
