Animal Kingdom — Set 5
Biology · जंतु जगत · Questions 41–50 of 50
Which animal is known as the 'Vampire of the Sea' due to its parasitic nature on fish?
Correct Answer: A. Lamprey
Lampreys are jawless fishes that often attach themselves to other fish to suck their blood. They use a circular, sucker-like mouth filled with sharp teeth to rasp away the host's skin. They belong to the primitive vertebrate class Cyclostomata.
The 'Pearly Nautilus' is a unique member of which phylum?
Correct Answer: B. Mollusca
The correct answer is 'Mollusca'. The Nautilus is a cephalopod mollusk that has retained a coiled external shell. While most other cephalopods like octopuses have lost their shells, the Nautilus uses its shell for buoyancy. It is often referred to as a 'living fossil'.
Which of the following is the largest living land animal?
Correct Answer: B. African Elephant
The African Elephant is the largest and heaviest land animal currently in existence. While the Blue Whale is the largest animal overall, it lives in the ocean. African elephants are known for their large ears and long trunks.
What is the scientific term for the study of fishes?
Correct Answer: C. Ichthyology
Ichthyology is the branch of zoology devoted to the study of fish. Ornithology is the study of birds, while Entomology focuses on insects. Herpetology is the study of amphibians and reptiles.
Which of the following is a mammal that can fly?
Correct Answer: D. Bat
Bats are the only mammals capable of true, sustained flight. Their wings are made of a thin membrane of skin stretched over elongated finger bones. Flying squirrels can only glide between trees and do not actually fly.
In which phylum do we find 'Symmetry-less' or 'Asymmetrical' animals?
Correct Answer: D. Porifera
Most sponges in the phylum Porifera do not have any fixed body symmetry and are thus called asymmetrical. They cannot be divided into two equal halves through any plane passing through the center. Some higher sponges, however, may show radial symmetry.
Which organ is used by fish for maintaining buoyancy in water?
Correct Answer: D. Swim bladder
The swim bladder is a gas-filled organ that helps bony fish control their depth in water without swimming. By adjusting the amount of gas, the fish can stay at a constant depth. Cartilaginous fish like sharks lack this organ and must swim to stay afloat.
To which class does the 'Whale' belong?
Correct Answer: A. Mammalia
The correct answer is 'Mammalia'. Whales are aquatic mammals that breathe air through lungs and give birth to live young. They also possess mammary glands to feed their young, which distinguishes them from fish. Despite their fish-like appearance, they are warm-blooded and have a four-chambered heart.
Which of the following phyla contains the maximum number of species?
Correct Answer: B. Arthropoda
Arthropoda is the largest phylum of the animal kingdom, including over two-thirds of all named species on Earth. This success is attributed to their versatile exoskeleton and jointed appendages. Insects alone make up the majority of this phylum.
The 'Water Canal System' is the hallmark of which animal group?
Correct Answer: C. Sponges
Sponges rely on a water canal system for gathering food, gas exchange, and waste removal. Water enters through ostia into a central cavity called the spongocoel. It is then expelled through the osculum.