Animal Kingdom — Set 3
Biology · जंतु जगत · Questions 21–30 of 50
The 'Canal System' is a characteristic feature found in?
Correct Answer: B. Sponges
Sponges use a canal system to circulate water throughout their bodies for nutrition and respiration. Water enters through ostia and exits through a large opening called the osculum. Choanocytes or collar cells line these canals to filter food particles.
Which group of animals is known as 'Amphibians of the Plant Kingdom' (Conceptual parallel in Zoology)?
Correct Answer: D. Amphibians
Amphibians are animals that live both on land and in water, requiring water specifically for reproduction. Their name is derived from the Greek words 'amphi' meaning dual and 'bios' meaning life. They represent a transitional group between aquatic and terrestrial vertebrates.
To which phylum do 'Earthworms' and 'Leeches' belong?
Correct Answer: B. Annelida
Earthworms and leeches belong to Annelida, the phylum of segmented worms. Their bodies are divided into repetitive segments called metameres. They possess a true coelom and a closed circulatory system.
Which of the following mammals is oviparous (lays eggs)?
Correct Answer: C. Duck-billed Platypus
The Duck-billed Platypus is a monotreme, a primitive group of mammals that lay eggs instead of giving birth. Despite laying eggs, they nourish their young with milk from mammary glands. They are found exclusively in eastern Australia and Tasmania.
What is the common name for the animal 'Pheretima posthuma'?
Correct Answer: B. Earthworm
Pheretima posthuma is the scientific name for the common Indian earthworm. It plays a vital role in soil fertility by aerating the ground and decomposing organic matter. It is often called the 'friend of the farmer'.
Which phylum consists exclusively of marine animals?
Correct Answer: C. Echinodermata
Echinodermata is the only major animal phylum that is entirely marine, with no freshwater or terrestrial representatives. They are characterized by a spiny skin and an endoskeleton of calcareous ossicles. Examples include starfish, brittle stars, and sea lilies.
The exoskeleton of insects is composed of which polysaccharide?
Correct Answer: C. Chitin
Chitin provides structural support and protection as the primary component of the arthropod exoskeleton. It is a nitrogen-containing polysaccharide that is tough and waterproof. During growth, insects must shed this exoskeleton in a process called molting.
Which of the following is a 'Social Insect'?
Correct Answer: B. Honeybee
Honeybees live in highly organized colonies with a clear division of labor among queens, drones, and workers. This complex social structure is a hallmark of certain hymenopteran insects. They communicate through specific behaviors like the 'waggle dance'.
To which group do 'Sea Horses' belong?
Correct Answer: D. Fishes
Sea horses are actually bony fishes belonging to the family Syngnathidae. They possess gills, fins, and a swim bladder despite their unusual upright swimming posture. A unique feature is that the males carry the developing eggs in a brood pouch.
The body of a Tapeworm is divided into segments called?
Correct Answer: C. Proglottids
Tapeworms are composed of a head called a scolex followed by a chain of reproductive segments called proglottids. As the worm grows, new proglottids are added near the neck. Mature segments containing eggs eventually detach and leave the host's body.