Animal Kingdom — Set 1
Biology · जंतु जगत · Questions 1–10 of 50
Which of the following animals belongs to the Phylum Porifera?
Correct Answer: A. Sycon
Sycon is a member of Phylum Porifera, which are commonly known as sponges. These animals are characterized by the presence of numerous pores called ostia on their body. They are generally marine and possess a cellular level of organization.
The presence of a 'Water Vascular System' is a unique feature of which phylum?
Correct Answer: D. Echinodermata
Echinodermata is the phylum that possesses a water vascular system used for locomotion and respiration. Examples of this phylum include sea stars and sea urchins. They also exhibit pentamerous radial symmetry in their adult stage.
Which class of animals is characterized by the presence of pneumatic (hollow) bones?
Correct Answer: A. Aves
Aves, or birds, have hollow bones containing air cavities to reduce body weight for flight. This adaptation is crucial for their aerial lifestyle. Their forelimbs are also modified into wings to support flying.
Animals that can maintain a constant body temperature regardless of the environment are called?
Correct Answer: A. Homeotherms
Homeotherms, such as mammals and birds, are warm-blooded animals that regulate internal heat. This allows them to remain active in a wide variety of climates. In contrast, cold-blooded animals rely on external heat sources.
Which of the following phyla is known for having a segmented body with jointed appendages?
Correct Answer: A. Arthropoda
Arthropoda is characterized by a segmented body and the presence of jointed legs. It is the largest phylum in the animal kingdom, comprising over 80% of all known species. They also possess a tough exoskeleton made of chitin.
Metagenesis (alternation of generations) is commonly observed in which group?
Correct Answer: C. Cnidarians
Cnidarians like Obelia exhibit metagenesis, where they alternate between polyp and medusa forms. The polyp is usually sessile and asexual, while the medusa is free-swimming and sexual. This phenomenon helps in the colonization of different marine habitats.
Which animal is considered a connecting link between reptiles and birds?
Correct Answer: A. Archaeopteryx
Archaeopteryx displays features of both reptiles, like teeth and a long tail, and birds, like feathers. It is widely regarded by paleontologists as a transitional fossil. Its discovery provided significant insights into the evolution of flight.
Flame cells are the excretory structures found in which of the following?
Correct Answer: C. Flatworms
Flatworms, belonging to the phylum Platyhelminthes, use flame cells for osmoregulation and excretion. These cells function like a kidney by filtering waste products from the body. Planaria and liver flukes are typical examples of this group.
To which class do sharks and rays belong?
Correct Answer: A. Chondrichthyes
Sharks and rays are members of Chondrichthyes, which are fishes with a cartilaginous skeleton. They lack a swim bladder and must swim constantly to avoid sinking. Their skin is covered with microscopic placoid scales.
What is the primary respiratory organ in adult frogs when they are on land?
Correct Answer: D. Lungs
Adult frogs primarily use their lungs for respiration while they are on land. However, they also utilize their moist skin for gas exchange, a process known as cutaneous respiration. Tadpoles, the larval stage of frogs, rely entirely on gills.