Question 71:
Which type of organism has a hard exoskeleton made primarily of chitin?
A) Mollusks
B) Annelids
C) Arthropods
D) Echinoderms
Answer: C) Arthropods
Explanation: Arthropods, such as insects and crustaceans, have an exoskeleton made of chitin, providing support and protection.
Question 72:
Which of the following animals is an endotherm?
A) Lizard
B) Frog
C) Penguin
D) Shark
Answer: C) Penguin
Explanation: Penguins are endothermic (warm-blooded) birds that maintain a constant body temperature regardless of the environment.
Question 73:
Which of the following is a characteristic feature of amphibians?
A) Feathers
B) Scales
C) Moist skin
D) Mammary glands
Answer: C) Moist skin
Explanation: Amphibians typically have moist skin that is important for respiration and hydration.
Question 74:
What type of reproduction do jellyfish typically undergo?
A) Asexual reproduction
B) Sexual reproduction
C) Both asexual and sexual reproduction
D) Budding
Answer: C) Both asexual and sexual reproduction
Explanation: Jellyfish can reproduce both sexually (producing eggs and sperm) and asexually (through budding in their polyp stage).
Question 75:
Which group of animals has a three-chambered heart?
A) Mammals
B) Reptiles
C) Birds
D) Fish
Answer: B) Reptiles
Explanation: Most reptiles have a three-chambered heart, which consists of two atria and one ventricle, allowing for some mixing of oxygenated and deoxygenated blood.
Question 76:
What is the primary function of the gills in fish?
A) Digestion
B) Circulation
C) Respiration
D) Excretion
Answer: C) Respiration
Explanation: Gills are specialized organs in fish that extract oxygen from water for respiration.
Question 77:
Which of the following statements about sponges is true?
A) They have a complex nervous system.
B) They are primarily autotrophic.
C) They lack true tissues.
D) They have a circulatory system.
Answer: C) They lack true tissues.
Explanation: Sponges are simple organisms that lack true tissues and organs, functioning instead through a porous body structure.
Question 78:
Which of the following animals is known for having a large brain relative to body size?
A) Ant
B) Dolphin
C) Snake
D) Goldfish
Answer: B) Dolphin
Explanation: Dolphins are known for their high intelligence and have a large brain-to-body ratio compared to many other animals.
Question 79:
Which of the following is a characteristic of all mammals?
A) Laying eggs
B) Hair or fur
C) External fertilization
D) Cold-blooded
Answer: B) Hair or fur
Explanation: All mammals possess hair or fur at some stage of their life cycle, which distinguishes them from other animal groups.
Question 80:
Which of the following animals undergoes metamorphosis?
A) Shark
B) Crab
C) Butterfly
D) Alligator
Answer: C) Butterfly
Explanation: Butterflies undergo complete metamorphosis, transforming from a larval stage (caterpillar) to a pupa (chrysalis) and finally to an adult.
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