Free Kingdom Animalia MCQs with Answers

641. Everything is true about coelom except:

• A. Found between body wall and gut
• B. Fluid filled
• C. Lined by mesoderm
• D. Bound internally by cuticle of intestine

Explanation: Coelom is internally lined by visceral layer of mesoderm. In pseudocoelomates body cavity is internally bound by cuticle of intestine.

642. Acoelomates do not lack:

• A. Coelom
• B. Mesoderm
• C. Special transport system
• D. Coelomic fluid

Explanation: Acoelomates are triploblastic animals in which all the three germinal layers ectoderm. mesoderm and endoderm are present.

643. _is a human parasite commonly known as pinworm.

• A. Fasciola hepatica
• B. Taenia solium
• C. Enterobius vermicularis
• D. Aurelia aurita

Explanation: Enterobius vermicularis commonly known as pinworm is cosmopolitan but more common in Europe and America. Pinworms are parasites in the human caecum, colon, and appendix.

644. The internal opening of nephridia is called:

• A. Nephridiopore
• B. Nephrostome
• C. Metanephridia
• D. Nephropore

Explanation: Nephronstome is the internal opening of nephridia, serving as the entry point for waste and fluids to enter the excretory system.

645. Scavenger insects may eat:

• A. Dead matter present in an organism
• B. Dead animals and plants
• C. Dead plant matter only
• D. Living animals only

Explanation: Scavengers are those animals that feed on dead animals and plants e.g. Drosophila and Vulture.

646. Members of this phylum are exclusively marine:

• A. Porifera
• B. Cnidaria
• C. Mollusca
• D. Echinodermata

Explanation: The echinoderms are exclusively marine.There are over 5,000 known species of echinoderms. They are marine organisms living at the sea bottom.

647. Water enters the water vascular system through:

• A. Radial canal
• B. Ampulla
• C. Ostla
• D. Madreporite

Explanation: The madreporite is a sieve-like, porous plate found on the aboral surface (the side opposite the mouth) of echinoderms such as starfish.It acts as the entry point for water into the water vascular system.Water enters through the madreporite and then circulates through a series of canals (stone canal → ring canal → radial canals → tube feet).

648. _is a common parasite of the intestine of humans and pigs, which belongs to phylum nematode.

• A. Taenia solium
• B. Ascaris lumbricoides
• C. Schistosoma
• D. Fasciola hepatica

Explanation: Ascaris worms inhabit the lumen of the small intestine of human and pig.

649. Which group of organisms has the following features?1. Three pairs of jointed legs2. Three-part segmented body3. One pair of antennae

• A. Arachnoids
• B. Crustaceans
• C. Insects
• D. Myriapods

Explanation: In insects, the head bears a pair of antennae, which serve as important sensory organs for detecting smell, touch, and vibrations, and also carries compound eyes, each made up of many small visual units that provide a wide field of view. The insect body is divided into three distinct regions: head, thorax, and abdomen. The thorax, which is the locomotory center, consists of three segments prothorax, mesothorax, and metathorax. Each of these segments carries one pair of jointed legs, giving insects a total of three pairs of legs. Additionally, many insects bear one or two pairs of wings on the middle and last thoracic segments, making them the only invertebrates capable of active flight. The abdomen contains major internal organs, including those for digestion, excretion, and reproduction, completing the characteristic body plan of insects.

650. The lower jaw is composed of only one large bone:

• A. Reptiles
• B. Amphibian
• C. Chondrichthyes
• D. Mammals

Explanation: The lower Jaw of mammals consists of only one bone, the dentary, and the jaw hinge connects the dentary to the squamosal (flat) part of the temporal bone in the skull. Working together, these muscles permit up-and-down and side-to-side movements of the jaw,making chewing possible which is unique to mammals.