Free Kingdom Animalia MCQs with Answers

211. In some coelenterates, there are special feeding zooids which are called_which perform only the function of nutrition for the whole colony:

• A. Gonozooids
• B. Gastrozooids
• C. Astrozoids
• D. Medusazoids

Explanation: Gastrozooids are specialized feeding zooids in some coelenterates (such as certain colonial cnidarians like hydroids). They perform the function of nutrition for the entire colony by capturing and digesting prey. These zooids are responsible for obtaining and processing food.

212. One of the reasons for the success of phylum Arthropoda is its:

• A. Large variety of organism
• B. Malpighian tubules
• C. Chondrichthyes
• D. Mammals

Explanation: Arthropods exhibit an incredible diversity of organisms, including insects, arachnids, crustaceans, and more. This diversity has contributed significantly to their evolutionary success, allowing them to adapt to various environments and ecological niches.

213. Pigment cells called chromatophores are present in:

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

Explanation: Chromatophores are pigment cells present in amphibians like frogs, salamanders, and newts. These cells enable them to change their skin color for camouflage, communication, and thermal regulation.

214. The mammal-like reptile that was found as a fossil in Texas:

• A. Archaeopteryx
• B. Duckbill platypus
• C. Varanope
• D. Opossum

Explanation: Varanope is a mammal-like reptile fossil found in Texas. It belongs to a group known as varanopids, which were early synapsids, a lineage that eventually gave rise to mammals.

215. The most important function of suckers is:

• A. Absorption of blood
• B. Attachment
• C. Ingestion of food
• D. Excretion of waste

Explanation: Suckers in various organisms, such as in insects or parasites like leeches, are specialized structures primarily designed for attachment. They allow these organisms to adhere to surfaces, including host organisms, for purposes like feeding or reproduction.

216. The animals of the phylum_are known as schizocoelous.

• A. Arthropoda
• B. Echinodermata
• C. Porifera
• D. Chordata

Explanation: Animals of the phylum Arthropoda exhibit schizocoelous development, which involves the splitting of the mesoderm to form a coelom. This type of coelom formation is characteristic of arthropods.

217. All of the following have no swim bladder except:

• A. Cyclostomes
• B. Chondrichthyes
• C. Osteichthyes
• D. Amphibians

Explanation: Osteichthyes, which include bony fish, do have a swim bladder. The swim bladder is a gas-filled sac that helps fish to control their buoyancy and maintain their position in the water column.

218. _is a common feature of all mammals.

• A. Viviparous
• B. Have placenta
• C. Right aortic arch
• D. Mammary glands

Explanation: Mammary glands are a characteristic of all mammals. These specialized glands produce milk, which is used to nourish and feed the young. The milk is rich in nutrients and antibodies, which help to protect the young from disease and infection. Mammals are named after these glands, which are unique to the class Mammalia.

219. Which phylum does not show tissue level of organization?

• A. Nematoda
• B. Coelenterata
• C. Porifera
• D. Echinodermata

Explanation: Phylum Porifera, which includes sponges, has no tissue level organization. Sponges are the simplest animals and are characterized by their lack of true tissues, organs, and body symmetry. Instead, they have a porous body with numerous openings called ostia, which allow water to flow through the sponge and filter out food particles.

220. What is false about the closed circulatory system?

• A. Blood pressure is high and regular
• B. Amount of blood is limited
• C. Blood circulates through arteries, veins, and capillaries
• D. Blood pressure is low and irregular

Explanation: In an open circulatory system, blood pressure is generally low and irregular, as the blood is not confined to vessels and instead flows freely through the body cavity. This can limit the efficiency of oxygen and nutrient delivery to the body's tissues, as well as the removal of waste products. In contrast, a closed circulatory system maintains a higher and more consistent blood pressure, which allows for more efficient delivery of oxygen and nutrients to the body's tissues.