Free Kingdom Animalia MCQs with Answers

871. Which of the following animals is sedentary in the adult and active in the larval stage?

• A. Sponge
• B. Leech
• C. Salamander
• D. Grasshopper

Explanation: Sponges are animals that belong to the phylum Porifera. They have a sedentary or sessile lifestyle in their adult stage and are active in their larval stage.

872. Which of the following is included in protostome?

• A. Amphioxus
• B. Sea horse
• C. Cheatopterus
• D. Sea cucumber

Explanation: Cheatopterus is a genus of trilobite, which is a group of extinct arthropods. Trilobites are examples of protostomes, which represent a major evolutionary branch of bilaterally symmetrical animals.

873. Book lungs may be found in which of the following

• A. Clam worm
• B. Spider
• C. Silverfish
• D. Leech

Explanation: Book lungs are respiratory organs found in certain arachnids, such as spiders. They are called "book lungs" because their structure resembles a series of pages in a book. These respiratory organs are located in the abdomen of spiders and are used for gas exchange, allowing spiders to breathe oxygen from the surrounding air.

874. Aestivation is also known as:

• A. Spring sleep
• B. Winter Sleep
• C. Autumn sleep
• D. Summer sleep

Explanation: Aestivation is a term used to describe a state of inactivity or dormancy that certain animals enter during hot or dry periods, typically in the summer season. It is similar to hibernation but occurs in response to high temperatures or drought conditions rather than cold temperatures. During aestivation, animals may reduce their metabolic rate, seek shelter, and conserve energy until more favorable conditions return. Therefore, aestivation is commonly referred to as "summer sleep."

875. Which of the following is a swimming bird?

• A. Penguin
• B. Ostrich
• C. Hawk
• D. Kiwi

Explanation: Penguins are swimming birds. They are highly adapted to aquatic life and are known for their ability to swim and drive in the ocean. They have streamlined bodies, webbed feet, and wings modified as flippers, which help them navigate through water.

876. Round worms, which have body cavities that are partially lined with mesoderm, are classified as:

• A. Acaelomate
• B. ceolomates
• C. Pseudocoelomates
• D. Deuterostomes

Explanation: A pseudocoelomate is an organism with a body cavity called a pseudocoelem that is not derived from the mesoderm, as in a true coelom, or body cavity. In invertebrates, the pseudocoelom is filled with fluid that lies between the mesoderm layer of the external body wall and the endoderm layer of the gut. But this is not a true coelem as it originates from the blastocoel, not the archenteron of Gastrula, which is the true site of origin of coelem. Roundworms in the phylum Aschelminthes are pseudocoelemates.

877. Crustaceans are the only arthropods that have:

• A. chitin in their exoskeleton
• B. chlicitae
• C. three pairs of legs
• D. two pairs of antennae

Explanation: Crustaceans are the only arthropods with two pairs of antennae, so option D is correct. All arthropods have chitin in their exoskeleton. Chelicerae are mouth parts present in some arthropods like arachnids, horseshoe crabs, and sea spiders, but they are absent in crustaceans. Crustaceans have five pairs of legs, not three.

878. In spiders, the organs that contain the silk glands are called

• A. spinneret
• B. Carapace
• C. Medriporite
• D. Tube feet

Explanation: Spiders, which belong to the phylum Arthropoda, are predators who trap their prey by producing silk threads. The spinneret is the silk-producing organ in spiders.

879. Which of the following bird structures are especially adapted to support flight?

• A. Cloacas
• B. Bills
• C. Gizzard
• D. chest muscles

Explanation: The shape of the sternum and chest muscles aid birds in flight.

880. Which of the following is NOT an innate behavior?

• A. A mammal sucking milk
• B. A dog looking for its food dish
• C. A worm moving away from bright light
• D. A spider spinning a web

Explanation: The correct answer is Option B: 'A dog looking for its food dish.' This behavior is learned because dogs associate the dish with food through experience. In contrast, the other behaviors listed are innate, meaning they are instinctive and do not require learning or experience. A mammal sucking milk, a worm moving away from bright light, and a spider spinning a web are all actions that animals perform without prior learning, driven by instinctual responses.