Free Kingdom Animalia MCQs with Answers

891. In which of the following, does the pharynx opens directly into the intestine?

• A. Planaria
• B. Earthworm
• C. Cockroach
• D. Snail

Explanation: In planaria, the mouth opens into muscular tubular pharynx which leads into the intestine.

892. Coelentrates have hydrostatic skeletion except:

• A. Coral
• B. Sea anemone
• C. Hydra
• D. Jellyfish

Explanation: Corals are unique among coelenterates because they secrete a hard exoskeleton made of calcium carbonate (CaCO3), which is distinct from the hydrostatic skeleton found in other coelenterates like sea anemones, hydras, and jellyfish. These other organisms use fluid pressure within their bodies to maintain shape and support movement. Thus, corals are the exception to the typical hydrostatic skeleton seen in this group.

893. A complex form of learning that requires the manipulation of mental concepts to arrive at adaptive behavior is:

• A. Imprinting
• B. Insight learning
• C. Latent learning
• D. Trial & error learning

Explanation: The complex form of learning that requires the manipulation of mental concepts for developing an adaptive behaviour is called insight learning.

894. All of the following are triploblastic animals except:

• A. Annelida
• B. Mollusca
• C. Coelenterata
• D. Echinodermata

Explanation: Phylum Coelenterata is a group of aquatic and marine organisms with a radially symmetrical body. They are diploblastic organisms in which the body is made up of two embryonic layers i.e. ectoderm and endoderm.

895. Hermaphrodite phylum is:

• A. Annelida
• B. Arthropoda
• C. Echinodermata
• D. Mollusca

Explanation: A hermaphrodite is an organism with both male and female reproductive organs. Annelids are mostly hermaphroditic, making option A the correct answer. Arthropods, echinoderms, and mollusks generally have separate sexes, with only some exceptions showing hermaphroditism.

896. The larva of balanoglossus (Hemichordate) is called:

• A. Bipinnaria
• B. Radiolaria
• C. Tornaria
• D. Trochophore

Explanation: Balanoglossus is a genus of ocean-dwelling acorn worms (Enteropneusta). Many hemichordates such as acorn worms have a larval stage in their life cycle; the larvae, called tornariae, swim using microscopic hairs called cilia. The tornaria larva resembles the bipinnaria larva of echinoderms.

897. Which of the following animal is included in deuterostome?

• A. Mytilus
• B. Chaetopterus
• C. Penguin
• D. Jellyfish

Explanation: Deuterostomes are a group of animals characterized by their embryonic development, where the anus forms before the mouth. Penguins, as part of the phylum Chordata, are considered deuterostomes. In contrast, Mytilus and Chaetopterus are classified as protostomes, which develop with the mouth forming first. Jellyfish, from the phylum Cnidaria, do not fit into either category due to their unique body structure and embryonic development.

898. Porifera is related to the sub Kingdom of:

• A. Protozoa
• B. Parazoa
• C. Metazoa
• D. Aves

Explanation: Porifera, commonly known as sponges, belong to the subkingdom Parazoa within the kingdom Animalia. Parazoa is characterized by simple multicellular organisms that lack true tissues. This distinguishes them from the more complex tissue organization found in the subkingdom Metazoa, which includes most other animals. Protozoa are not part of the animal kingdom and are instead considered protists. Aves, being a class within the subphylum Vertebrata, are not related to the simple structure of Porifera.

899. The females of one of the following classes possess a single overy, that is:

• A. Pisces
• B. Amphibia
• C. Reptilia
• D. Aves

Explanation: The correct answer is Aves. Female birds generally possess a single ovary on the left side of their body, an adaptation believed to support flight by minimizing body weight. In contrast, the other vertebrate classes listed-Pisces, Amphibia, and Reptilia-usually have two ovaries. This bilateral ovary arrangement is suited to their respective environments and does not have the weight constraints associated with flight.

900. Chiroptera are:

• A. Flying mammals
• B. Flesh-eating mammals
• C. Hoofed mammals
• D. Aquatic mammals

Explanation: Chiroptera, commonly known as bats, are the only flying mammals. Their wings are composed of a thin membrane of skin supported by elongated finger bones, enabling them to achieve powered flight. This adaptation distinguishes them from other mammals that might glide but cannot sustain flight. The incorrect options include: flesh-eating mammals, which are not an accurate general classification as most bats eat insects or fruits; hoofed mammals, which have hooves unlike the bat's wing structure; and aquatic mammals, which are adapted to life in water, in contrast to the terrestrial and aerial adaptations of bats.