Free Kingdom Animalia MCQs with Answers

351. Roundworms have all of the following characteristics except:

• A. Pseudocoelom
• B. Bilateral symmetry
• C. Mesoderm germ layer
• D. Ectoderm germ layer
• E. Notochord

Explanation: Only members of the phylum Chordata have notochords. Roundworms are in the phylum Nematoda.

352. A characteristic common to all chordates that is lacking in other animal groups is

• A. The appearance of pharyngeal gill slits
• B. The presence of three germ layers
• C. The presence of vertebrae
• D. A true coelom
• E. The embryonic appearance of an archenteron

Explanation: Pharyngeal gill slits appear only in chordates. All eumetazoa possess three germ layers and develop an archenteron. A true coelom is shared with other phyla, such as Echinodermata and Arthropoda. Not all chordates have vertebrae (only the vertebrates do).

353. The deuterostomes differ from protostomes in all of the following respects except:

• A. Early cleavages of the zygote
• B. The ultimate function of the opening to the Archenteron
• C. Number of germ layers in the developing embryo
• D. Embryonic origin of the mouth
• E. Embryonic origin of the coelom

Explanation: Both deuterostomes and protostomes have three germ layers.

354. An organism appears to be a segmented worm. Upon observation, it is determined that the organism has a closed circulation, a mouth, and an anus and does not have an exoskeleton. The organism most likely belongs to the phylum:

• A. Mollusca
• B. Annelida
• C. Echinodermata
• D. Arthropoda
• E. Chordate

Explanation: Annelida: This phylum includes segmented animals like; earthworms, leech, etc Their body is soft and bilaterally symmetrical Their body is divided into the ring like grove(segments) called annuli. They have a complete digestive system from the mouth to anus Excretion is by nephridia. They have a closed circulatory system. Sexes may be separate or united (sexual reproduction ). The true body cavity is present. Eg; Pheretima, leech.

355. An amphibian's heart has _ chambers:

• A. Two
• B. Three
• C. Four
• D. Five

Explanation: From an evolutionary perspective, amphibians are between fishes and reptiles i.e. more developed than fishes and less developed than reptiles. Amphibians have 3 chambers, more than fishes but less than reptiles.

356. Amphibians live on:

• A. Water
• B. Water and land
• C. Land
• D. Air

Explanation: Amphibians have gills as well as lungs which make it possible for them to live on both water and land.

357. Egg-laying mammals are called:

• A. Prototheria
• B. Protozoa
• C. Chordata
• D. Monotremes
• E. Both A and D

Explanation: Monotremes lay eggs and prototheria are both egg-laying mammals so the question has two correct answers. Chordata, the classification to which humans belong, are those that do not lay eggs but rather give birth to young ones. Protozoa, on the other hand, are unicellular organisms.

358. Organs which produce voice in birds is:

• A. Larynx
• B. Pharynx
• C. Syrinx
• D. Both A and C

Explanation: Organs of voice production in birds are called syrinx.

359. Coelom is a cavity lined by:

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

Explanation: Option A is correct as coelom is a fluid-filled cavity that is entirely lined by mesoderm. Options B, C, and D are incorrect as coelom is primarily lined by mesoderm only.

360. Which one of the following does not have intermediate host?

• A. Tapeworm
• B. Ascaris
• C. Liver fluke
• D. Plasmodium

Explanation: Organisms that have an intermediate host spend their lifetimes in two different organisms.