Question 31:
Which of the following animals is an ectotherm?
A) Human
B) Dolphin
C) Frog
D) Penguin
Answer: C) Frog
Explanation: Frogs are ectothermic (cold-blooded) animals, meaning their body temperature is regulated by the environment, unlike mammals, which are endothermic (warm-blooded).
Question 32:
What is the primary function of the dorsal fin in fish?
A) Locomotion
B) Balance and stability
C) Respiration
D) Feeding
Answer: B) Balance and stability
Explanation: The dorsal fin helps fish maintain balance and stability while swimming.
Question 33:
Which of the following groups is characterized by having a water vascular system?
A) Arthropoda
B) Cnidaria
C) Echinodermata
D) Mollusca
Answer: C) Echinodermata
Explanation: Echinoderms, such as sea stars and sea urchins, possess a water vascular system used for locomotion, feeding, and gas exchange.
Question 34:
Which type of animal is known for having a beak?
A) Mammals
B) Fish
C) Birds
D) Amphibians
Answer: C) Birds
Explanation: Birds have beaks, which are specialized for their feeding habits, varying significantly among different species.
Question 35:
Which of the following structures is involved in gas exchange in fish?
A) Lungs
B) Gills
C) Skin
D) Kidneys
Answer: B) Gills
Explanation: Gills are specialized structures that allow fish to extract oxygen from water for respiration.
Question 36:
Which group of animals has a cloaca?
A) Mammals
B) Reptiles
C) Birds
D) Both B and C
Answer: D) Both B and C
Explanation: Reptiles and birds both possess a cloaca, a single opening for excretion and reproduction.
Question 37:
Which of the following is a characteristic feature of amphibians?
A) Scales
B) Feathers
C) Moist skin
D) Mammary glands
Answer: C) Moist skin
Explanation: Amphibians typically have moist skin, which plays a vital role in respiration and hydration.
Question 38:
What type of body plan do flatworms (Platyhelminthes) exhibit?
A) Radial symmetry
B) Bilateral symmetry
C) Asymmetry
D) Pentaradial symmetry
Answer: B) Bilateral symmetry
Explanation: Flatworms exhibit bilateral symmetry, meaning their bodies can be divided into mirror-image halves along a single plane.
Question 39:
Which class of animals includes species that are primarily nocturnal and possess a highly developed sense of smell?
A) Mammals
B) Reptiles
C) Birds
D) Amphibians
Answer: A) Mammals
Explanation: Many mammals, such as owls and some rodents, are primarily nocturnal and have evolved a highly developed sense of smell to navigate and find food in the dark.
Question 40:
Which of the following animals undergoes a life cycle that includes a larval stage?
A) Shark
B) Chicken
C) Frog
D) Rabbit
Answer: C) Frog
Explanation: Frogs undergo metamorphosis, starting as aquatic larvae (tadpoles) before transforming into adult frogs.
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