Animal Kingdom — Set 2
Biology · जंतु जगत · Questions 11–20 of 50
Which of the following is a characteristic feature of Mammals?
Correct Answer: A. Presence of mammary glands
The presence of mammary glands to nourish the young is a defining trait of the class Mammalia. They also typically possess hair on their bodies and a four-chambered heart. Most mammals are viviparous, meaning they give birth to live young.
To which phylum does the 'Octopus' belong?
Correct Answer: A. Mollusca
The Octopus belongs to the phylum Mollusca, specifically the class Cephalopoda. Mollusks are soft-bodied animals that often possess a hard external or internal shell. The octopus is notable for its high intelligence and lack of a protective shell.
The 'Radula' is a rasping tongue-like organ found in?
Correct Answer: A. Mollusks
A radula is used by most mollusks for feeding by scraping or cutting food. It consists of several rows of tiny chitinous teeth. It is absent in bivalves like clams which are filter feeders.
Which phylum is characterized by the presence of a 'Notochord' at some stage of life?
Correct Answer: B. Chordata
Chordata is defined by the presence of a notochord, a dorsal hollow nerve cord, and pharyngeal gill slits. In vertebrates, the notochord is replaced by the vertebral column during development. This phylum includes fishes, amphibians, reptiles, birds, and mammals.
Insects belong to which class under Phylum Arthropoda?
Correct Answer: A. Insecta
Insects are classified under the class Insecta, which is the most diverse group of animals. They are characterized by having three body segments and three pairs of legs. Most insects also possess one or two pairs of wings.
Which of the following animals exhibits radial symmetry in its adult form?
Correct Answer: D. Starfish
Starfish exhibit radial symmetry as adults, meaning their body parts are arranged around a central axis. However, their larval stages show bilateral symmetry. This transition is a key evolutionary feature of the phylum Echinodermata.
The body cavity of a 'Roundworm' is known as a?
Correct Answer: A. Pseudocoelom
Roundworms, or nematodes, possess a pseudocoelom, which is a body cavity not fully lined by mesoderm. This cavity acts as a hydrostatic skeleton and helps in the distribution of nutrients. True coeloms appear first in the phylum Annelida.
Which of these is a flightless bird found in Australia?
Correct Answer: A. Emu
The Emu is a large, flightless bird native to Australia. While the Ostrich is from Africa and the Kiwi is from New Zealand, the Emu is the second-largest living bird. They have strong legs adapted for running long distances.
What is the specialized cell found in Cnidarians for defense and capturing prey?
Correct Answer: A. Cnidocytes
Cnidocytes contain stinging capsules called nematocysts that inject toxins into prey or predators. They are primarily located on the tentacles of jellyfish and corals. This feature gives the phylum Cnidaria its name.
Which of the following animals has a four-chambered heart?
Correct Answer: B. Crocodile
Crocodiles are unique among reptiles because they possess a fully four-chambered heart. Most other reptiles have a three-chambered heart with an incomplete septum. This efficient circulatory system supports their large size and predatory lifestyle.