1. What is the exoskeleton of insects made of?
a) Chitin
b) Keratin
c) Collagen
d) Protein
Answer: a) Chitin
2. Which of the following is a characteristic feature of arthropods?
a) Endoskeleton
b) Jointed legs
c) Lack of segmentation
d) Soft body
Answer: b) Jointed legs
3. What is the primary function of an insect’s antennae?
a) Locomotion
b) Detection of pheromones and stimuli
c) Reproduction
d) Feeding
Answer: b) Detection of pheromones and stimuli
4. What type of circulatory system do arthropods have?
a) Closed
b) Open
c) Lymphatic
d) None of the above
Answer: b) Open
5. The process by which insects grow by shedding their exoskeleton is called:
a) Regeneration
b) Metamorphosis
c) Ecdysis
d) Germination
Answer: c) Ecdysis
6. Which organ is primarily responsible for respiration in insects?
a) Lungs
b) Tracheae
c) Gills
d) Spiracles
Answer: b) Tracheae
7. What structure do insects use to sense light?
a) Compound eyes
b) Simple eyes (ocelli)
c) Antennae
d) Palps
Answer: b) Simple eyes (ocelli)
8. Which of the following is true about the nervous system of insects?
a) It has a centralized brain and nerve cords
b) It has a brain but no ganglia
c) It lacks a brain
d) It is controlled solely by the spinal cord
Answer: a) It has a centralized brain and nerve cords
9. The exoskeleton of arthropods serves which of the following functions?
a) Protection
b) Support
c) Muscle attachment
d) All of the above
Answer: d) All of the above
10. What type of digestive system do insects have?
a) One-way digestive system
b) Two-way digestive system
c) Simple stomach
d) None of the above
Answer: a) One-way digestive system
11. Which part of the insect’s body is responsible for food ingestion?
a) Head
b) Thorax
c) Abdomen
d) Mandibles
Answer: a) Head
12. Insects have how many pairs of wings?
a) One pair
b) Two pairs
c) Three pairs
d) No wings
Answer: b) Two pairs
13. What is the primary function of the malpighian tubules in insects?
a) Reproduction
b) Respiration
c) Excretion
d) Feeding
Answer: c) Excretion
14. Which is the largest group of arthropods?
a) Crustaceans
b) Insects
c) Myriapods
d) Arachnids
Answer: b) Insects
15. What is the term for the shedding of an insect’s exoskeleton?
a) Metamorphosis
b) Ecdysis
c) Molting
d) Both b and c
Answer: d) Both b and c
16. Insects with complete metamorphosis go through how many stages?
a) Two
b) Three
c) Four
d) Five
Answer: c) Four
17. What is the name of the insect’s heart?
a) Dorsal vessel
b) Ventral nerve cord
c) Malpighian tubules
d) Spiracles
Answer: a) Dorsal vessel
18. What are the legs of insects typically used for?
a) Locomotion
b) Defense
c) Feeding
d) Reproduction
Answer: a) Locomotion
19. Which of the following is true about insect wings?
a) They are all membranous
b) They are always present in pairs
c) They may be modified for different functions
d) None of the above
Answer: c) They may be modified for different functions
20. The main function of an insect’s compound eyes is:
a) Detection of sound
b) Detection of temperature
c) Vision and perception of light
d) Reproduction
Answer: c) Vision and perception of light
21. What is the name of the organ system responsible for excretion in arthropods?
a) Digestive system
b) Circulatory system
c) Excretory system
d) Reproductive system
Answer: c) Excretory system
22. Which structure in the insect’s body is responsible for secreting silk in silkworms?
a) Mandibles
b) Spinnerets
c) Spiracles
d) Abdomen
Answer: b) Spinnerets
23. How do insects primarily reproduce?
a) Asexual reproduction
b) Sexual reproduction
c) Budding
d) Binary fission
Answer: b) Sexual reproduction
24. Insect larvae and nymphs are examples of:
a) Egg stages
b) Immature stages
c) Adult stages
d) Pupa stages
Answer: b) Immature stages
25. Which type of insect metamorphosis involves a pupa stage?
a) Incomplete metamorphosis
b) Complete metamorphosis
c) Both a and b
d) None of the above
Answer: b) Complete metamorphosis
26. Which part of the insect’s brain is responsible for regulating sensory information?
a) Cerebrum
b) Mushroom bodies
c) Compound eyes
d) Ocelli
Answer: b) Mushroom bodies
27. The circulatory system of arthropods primarily transports:
a) Oxygen
b) Nutrients
c) Blood
d) Hemolymph
Answer: d) Hemolymph
28. Which of the following is a function of the insect’s spiracles?
a) Respiration
b) Feeding
c) Locomotion
d) Reproduction
Answer: a) Respiration
29. Insects can detect chemical signals called:
a) Pheromones
b) Light signals
c) Vibration signals
d) Sound signals
Answer: a) Pheromones
30. Which of the following is NOT a feature of the insect’s thorax?
a) Legs
b) Wings
c) Digestive system
d) All are features
Answer: c) Digestive system
These questions cover important aspects of insect biology, focusing on the structure and functions of arthropods, and are useful for exam preparation and general knowledge.
