Free Kingdom Animalia MCQs with Answers

701. Ancestors to animals:

• A. Protozoan
• B. Algae
• C. Slime molds
• D. Bacteria

Explanation: Protozoans are considered ancestors of animals because they transitioned to multicellular organisms early in evolution. They marked the emergence of the animal kingdom.

702. To biologists a fish is a:

• A. Crayfish
• B. Jellyfish
• C. Vertebrate
• D. Starfish

Explanation: Answer is "Vertebrate"Explanation: A sliver fish (Lepsima saccharina) is small primitive wingless insect. Crayfish are fresh water crustaceans resembling small lobsters. Starfish is an echinoderm. However, dogfish (Squalis achanthias) belongs to squalidae family of sharks.

703. Which one of the following is not a parasitic adaptation?

• A. Development of adhesive organs
• B. Loss of digestive organs
• C. Loss of reproductive capacity
• D. Loss of unnecessary sense organs

Explanation: Parasitism is a relationship between two living organisms of different species in which one organism called a parasite obtains its food directly from another living organism called the host. The parasite spends a part or whole of its life either on or inside the body of the host. The general parasitic adaptations are (i) anaerobic respiration in internal parasites, (ii) loss of certain organs, (iii) presence of adhesive organs, (iv) excessive multiplication, (v) resistant cysts and eggs for the safe transfer of their progeny to new hosts and (vi) well developed and complicated reproductive organs.

704. In which of the following animals is a dimorphic nucleus found?

• A. Amoeba proteus
• B. Trypanosoma gambiense
• C. Plasmodium vivax
• D. Paramecium caudatum

Explanation: Dimorphic nucleus means that two types of nuclei are present in P. caudatum - a large macronucleus and a small micronucleus. The macronucleus is roughly kidney shaped with an inconspicuous nuclear membrane. The macronucleus is the somatic or vegetative nucleus that controls the day to day metabolic activities of the cell. The micronucleus is lodged in a depression on the surface of the macronucleus. It is usually spherical, with a nuclear membrane and with diploid number of chromosomes. It controls the reproductive activities of the organism. Amoeba, Trypanosoma and Plasmodium have only one nucleus.

705. The function of the contractile vacuole in protozoa is:

• A. Osmoregulation
• B. Reproduction
• C. Locomotion
• D. Digestion of food

Explanation: The function of contractile vacuole is osmoregulatory. Water in freshwater protozoa enters the organism by endosmosis and during feeding. If the organism does not possess a mechanism to get rid of this excess water, it will swell to the point of rupture and dissolution. The mechanism which is assumed to affect water regulation is the contractile vacuole. The vacuole periodically increases in volume (diastole) to get filled with water and contracts (systole) to discharge its water content to the surrounding environment.

706. Penguin are usually present in _

• A. Australia
• B. Antarctica
• C. Africa
• D. America

Explanation: Penguins are a group of aquatic, flightless birds living almost exclusively in Antarctica. All penguins are countershaded, i.e they have a white underside and a dark (mostly black) upperside. This is for camouflage.

707. Acoclomates 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.

708. The following group is the an example of acoelomates:

• A. Platyhelminthes
• B. Aschelminthes
• C. Molluscs
• D. Annelids

Explanation: Examples of acoelomates are found phylum Platyhelminthes, commonly known as flatworms. These invertebrate animals are unsegmented worms with bilateral symmetry.

709. The coelom is a cavity lined by:

• A. Mesoderm
• B. Epiderm
• C. Endoderm
• D. Ectoderm

Explanation: The coelom is a fluid-filled cavity which is lined by the mesoderm. It is present in between the gastrointestinal tract and the body wall. An organism that has a fluid filled cavity lined by the mesoderm are called coelomates.Roundworms have a cavity which is not lined by the mesoderm, thus they are known as pseudocoelomates. Those organisms that lack a fluid filled cavity are called acoelomates.

710. It is an endoparasite of humans, cattle, and pigs that completes its life cycle in two hosts:

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

Explanation: This belongs to phylum platyhelminthes, class Cestoda, being exclusively endoparasite. The primary host of tapeworm is human and the secondary host is pig. The most common way to pick up a tapeworm is by eating undercooked meat. If pigs eat the infected feces containing eggs, the eggs hatch and the larvae form into cysts that make their way into the animals' muscles.