Question 21:
Which of the following animals is a filter feeder?
A) Shark
B) Whale
C) Octopus
D) Eagle
Answer: B) Whale
Explanation: Certain species of whales, like baleen whales, are filter feeders that strain small organisms from the water using baleen plates.
Question 22:
In which class of animals is the presence of mammary glands a defining feature?
A) Aves
B) Reptilia
C) Amphibia
D) Mammalia
Answer: D) Mammalia
Explanation: Mammals are characterized by the presence of mammary glands, which produce milk to nourish their young.
Question 23:
Which structure in the earthworm is primarily responsible for the circulation of blood?
A) Aortic arches
B) Gills
C) Tracheae
D) Hemocoel
Answer: A) Aortic arches
Explanation: Earthworms have a closed circulatory system where the aortic arches function like a heart, pumping blood through vessels.
Question 24:
Which of the following groups of animals are primarily herbivores?
A) Carnivores
B) Omnivores
C) Insectivores
D) Ruminants
Answer: D) Ruminants
Explanation: Ruminants, such as cows and sheep, are specialized herbivores that have a multi-chambered stomach to digest plant material efficiently.
Question 25:
Which of the following organisms is considered an invertebrate?
A) Frog
B) Starfish
C) Turtle
D) Human
Answer: B) Starfish
Explanation: Starfish belong to the phylum Echinodermata and are invertebrates, meaning they lack a backbone.
Question 26:
What type of reproduction is primarily seen in cnidarians?
A) Sexual reproduction only
B) Asexual reproduction only
C) Both sexual and asexual reproduction
D) Parthenogenesis
Answer: C) Both sexual and asexual reproduction
Explanation: Cnidarians can reproduce both sexually (producing gametes) and asexually (through budding or fragmentation).
Question 27:
Which of the following is a characteristic of mammals that distinguishes them from reptiles?
A) Laying eggs
B) Cold-blooded metabolism
C) Presence of hair or fur
D) Scales on the skin
Answer: C) Presence of hair or fur
Explanation: Mammals are characterized by the presence of hair or fur, unlike reptiles, which have scales.
Question 28:
Which of the following groups has members that can live both in water and on land?
A) Reptiles
B) Birds
C) Amphibians
D) Fish
Answer: C) Amphibians
Explanation: Amphibians, such as frogs and salamanders, are adapted to live in both aquatic and terrestrial environments.
Question 29:
What is the main function of the exoskeleton in arthropods?
A) Locomotion
B) Protection and support
C) Respiration
D) Digestion
Answer: B) Protection and support
Explanation: The exoskeleton in arthropods provides protection from physical damage and helps maintain body structure.
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