Free Kingdom Animalia MCQs with Answers

901. "Portuguese-man of war" is the:

• A. Desert-snake
• B. Coelenterate
• C. A big-reptile
• D. Black-forest monkey

Explanation: The Portuguese-man-of-war is a coelenterate, a marine invertebrate belonging to a group that includes jellyfish and sea anemones. It is a colonial organism composed of specialized polyps that perform different functions such as buoyancy, prey capture, and reproduction. Unlike reptiles, which are vertebrates with scales, or monkeys, which are mammals, the Portuguese-man-of-war is a venomous coelenterate capable of delivering a painful sting. It is not related to desert snakes or any type of mammal.

902. Amphibians generally have three chambers in their hearts. What type of chambers they are?

• A. One ventricle, two atria
• B. Two ventricles, one atrium
• C. One ventricle, one atrium
• D. One ventricle, one atrium, one sinus venosus

Explanation: Amphibians typically have a heart with three chambers, which includes one ventricle and two atria. This structure allows for some mixing of oxygenated and deoxygenated blood, which is suitable for their metabolism and lifestyle. In contrast, the hearts of birds and mammals have four chambers (two atria and two ventricles) to completely separate oxygenated and deoxygenated blood. The incorrect options either suggest an incorrect number of chambers or misidentify the sinus venosus as a primary chamber.

903. The study of fishes is:

• A. Ornithology
• B. Ichthyology
• C. Herpetology
• D. Serpetology

Explanation: The correct answer is Ichthyology, which is the scientific study of fishes, including their biology, classification, and conservation. Ornithology refers to the study of birds, Herpetology covers amphibians and reptiles, and 'Serpetology' is not an established scientific term.

904. Tornaria larva resembles with:

• A. Bipinnaria larva
• B. Trochophore larva
• C. Glochidium larva
• D. Instar larva

Explanation: Tornaria larva resembles with Bipinnaria larva. Because Tornaria larva of hemichordates and Bipinnaria of Echinodermata are very similar in shape and structure. The pattern of cleavage of a fertilised egg, formation of mesoderm, anus, mouth, and coelom in echinoderms and hemichordates is similar. So, most resemblance is with Bipinnaria larva.

905. Which of the following is not isotonic to sea water?

• A. Myxine (Hagfish)
• B. Skates
• C. Sharks
• D. Teleost (Bony Fishes)

Explanation: Marine teleosts are hypoosmotic to seawater, so they face osmotic loss of water and diffusional gain of NaCl across the gill.

906. Placoid scales are present in:

• A. Class cyclostomata
• B. Class osteichthyes
• C. Class chondricthyes
• D. Ceplialochordate

Explanation: Placoid scales are a unique type of scales that are present in cartilaginous fishes like sharks and rays. These scales have a characteristic tooth-like structure with a hard enamel-like surface. They are embedded in the skin and provide protection and reduce drag in the water. The presence of placoid scales is one of the distinguishing features of the class Chondrichthyes, which includes sharks, rays, and skates.

907. The giezard is used for crushing food in:

• A. Crocodile
• B. Frog
• C. Tiger
• D. Pigeon

Explanation: In the case of a pigeon, the gizzard is the part of their digestive system that helps with crushing and grinding food. Pigeons don't have teeth, so the gizzard, which is a muscular organ, contracts and uses small stones or grit to break down the food they eat. This process helps them extract as many nutrients as possible from their food. So, the gizzard in a pigeon is like a natural food processor.

908. Trichonympha lies in the digestive tract of _ which produces an enzyme that helps in the digestion of wood:

• A. Cattle
• B. Tumefaciens
• C. Human
• D. Termite

Explanation: Trichonympha is a tiny organism that lives inside the digestive tract of termites. It's like a little helper for termites because it produces special enzymes called cellulases. These enzymes are super important because they help termites break down and digest wood, which is their main source of food.

909. The amazing example of genetic and environmental influence on animal behavior is:

• A. Habituation
• B. Imprinting
• C. Operant learning
• D. Insight learning

Explanation: Imprinting is a behavior in which a young animal forms an attachment to another organism or object during a critical period early in life. It demonstrates a clear interaction between genetic predispositions and environmental influences. For example, the classic example is the imprinting of ducklings on their mother shortly after hatching.

910. Hag fish belongs To:

• A. Cartilaginous fishes
• B. Bony fishes
• C. Cyclostomes
• D. Both (A) & (B)

Explanation: Hagfish, also known as cyclostomes, are a type of jawless fish. They have a unique anatomy and behavior compared to cartilaginous fishes like sharks and rays. Hagfish are known for their slimy secretion and their ability to produce copious amounts of mucus as a defense mechanism. They play an important role in marine ecosystems.