Free Kingdom Animalia MCQs with Answers

531. In most triploblastic organisms, after embryonic development, the three layers are represented as?

• A. Their functions in the body
• B. Structures associated with them
• C. Separate layers of cells
• D. Structures formed from them

Explanation: Option A is wrong because, in triploblastic animals, the three layers represent the structures formed from them instead of separate layers of the cells. Option B is wrong because, in most triploblastic animals, the three germ layers represent structures formed from them instead of structures associated with them. Option C is wrong because, in most triploblastic animals, the three germ layers represent structures formed from them instead of their functions in the body.Option : D Gastrulation is a key phase in embryonic development when pluripotent stem cells differentiate into three primordial germ layers. It is characterized by movement and rearrangement of cells in the embryo. After embryonic development, in most triploblastic animals, three layers are represented as structures formed from them.

532. Haemolymph is present in?

• A. Amphibians
• B. Reptiles
• C. Fish
• D. None of the above options are correct

Explanation: Hemolymph is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues.

533. Ascaris is characterized by which of the following?

• A. Presence of true coelom and metamerism
• B. Presence of true coelom but the absence of metamerism
• C. Absence of true coelom but the presence of metamerism
• D. Absence of true coelom and metamerism

Explanation: Ascaris belongs to phylum Aschelminthes. It lacks a true coelom, possesses pseudocoelom and body is not metamerically segmented.

534. Which of the following exhibits both radial and bilateral symmetry?

• A. Molluscs
• B. Echinoderms
• C. Flatworms
• D. Sponges

Explanation: Echinoderms exhibit both radial and bilateral symmetry. During larval stages, echinoderms have bilateral symmetry whereas they have penta-radial or simply, radial symmetry during adult life. Molluscs and flatworms are phyla of bilateral symmetry. Sponges don't exhibit any symmetry; they are irregular/asymmetrical.

535. Saccoglossus belongs to

• A. Chordata
• B. Annelida
• C. Hemichordata
• D. Mollusca

Explanation: The Saccoglossus, which is also commonly known as the acorn worm, belongs to the phylum hemichordate. Saccoglossus is a genus of acorn worm (Class Enteropneusta). It is the largest genus in this class, with 18 species. This genus is characterized especially by the concentric rings of muscle fibers in the proboscis.

536. What is the distinctive feature of mammals?

• A. Ears
• B. Intellectual capability
• C. Diaphragm
• D. Limbs

Explanation: There are multiple features unique to mammals, like malleus, incus, and stapes in the ear, mammary glands, hair, and a diaphragm separating the heart and lungs from the abdomen.

537. Name common gut roundworm parasites of humans and pigs.

• A. Ascaris lumbricoides
• B. Lumbricus terrestris
• C. Pheretima posthuma
• D. Hirudo Medicinalis

Explanation: Ascaris lumbircoides is a large roundworm parasite that can infect both humans and pigs.

538. Fasciola is the name given to

• A. Tapeworm
• B. Planaria
• C. Liver fluke
• D. Earthworm

Explanation: Fasciola is a type of parasitic flatworm that is commonly known as the liver fluke. It is found in the liver and bile ducts of various mammals, including humans. Infection occurs by ingesting contaminated water or plants. The life cycle of the liver fluke involves a snail as an intermediate host and a mammal as a definitive host. The disease caused by Fasciola is called fascioliasis, which can lead to liver damage and other serious health problems if left untreated.

539. Ascaris is

• A. Diploblastic
• B. Triploblastic
• C. Haploid
• D. Acoelomate

Explanation: Ascaris is a genus of parasitic nematode worms known as the "small intestinal roundworms" that can infect the human small intestine. Ascaris worms are triploblastic, which means they have three germ layers during embryonic development: the ectoderm, mesoderm, and endoderm. They are also pseudocoelomates, meaning they have a body cavity that is not completely lined by mesodermal tissue.

540. During development, in an animal, mesoderm layer gives rise to

• A. Nervous System
• B. Alimentary canal lining
• C. Muscular and skeletal system
• D. Mouth

Explanation: During development, the mesoderm layer gives rise to the muscular system, skeletal system, circulatory system, and other organs such as the kidneys and reproductive system. The ectoderm gives rise to the nervous system and the skin, while the endoderm gives rise to the lining of the digestive and respiratory tracts and other internal organs such as the liver and pancreas.