Free Kingdom Animalia MCQs with Answers

291. Both radial and bilateral symmetry is found in which of the following phylum?

• A. Protozoa
• B. Porifera
• C. Echinodermata
• D. All of these

Explanation: Echinoderms exhibit a unique form of symmetry known as pentaradial symmetry in their adult stages. This means that their body parts are arranged in multiples of five around a central axis. This radial symmetry is evident in animals like starfish, sea urchins, and sea cucumbers. However, during their larval stages, echinoderms, especially in the early developmental phases, display bilateral symmetry. This bilateral symmetry is a characteristic of their larval forms and undergoes a transformation as they mature into the pentaradial symmetry seen in the adults.

292. Shell of egg is leathery in appearance in which of the following?

• A. Amphibians
• B. Prototherians
• C. Birds
• D. Reptiles

Explanation: Prototherians (monotremes) lay eggs with a leathery appearance. The eggs of monotremes like the platypus and echidna have a soft, leathery shell that provides protection and allows gas exchange.

293. One of these animals is a prototherian:

• A. Green plants
• B. Green algae
• C. Animals
• D. Both A and B

Explanation: The category "animals" includes a wide variety of organisms, and prototherians (monotremes) are one group of animals that are egg-laying mammals.

294. Which of the following character belongs to oligochaete?

• A. No prominent head region
• B. Separate sexes
• C. Trochophore larva
• D. Parapodia

Explanation: Oligochaetes, like earthworms, do not have a prominent head region. Their body lacks well-defined sensory structures or appendages at the anterior end.

295. Aschelminthes is also known as which of the following?

• A. Protozoans
• B. Eumetazoa
• C. Protoctista ancestors
• D. Nematodes

Explanation: Aschelminthes is also known as nematodes, which are a group of worms within the animal kingdom.

296. Which of the following combinations is incorrect?

• A. Nematoda-roundworms, pseudocoelomate
• B. Arthropoda - coelom present, bilateral symmetry
• C. Platyhelminthes - gastrovascular cavity, flatworms, acoelomate
• D. Calcarea-gastrovascular Cavity, coelom present

Explanation: This combination is incorrect. Calcarea is a class of sponges (phylum Porifera), not a phylum on its own. Sponges do not have a gastrovascular cavity; instead, they have a simple body plan with specialized cells for feeding and water flow. Additionally, sponges lack a true coelom; instead, their body organization is based on a cellular level with no true tissues or organs. Therefore, the combination of "gastrovascular cavity" and "coelom present" is incorrect for Calcarea.

297. Of the following which one is not included in Protostomes?

• A. Arthropods
• B. Hemichordates
• C. Annelids
• D. Molluscs

Explanation: Hemichordata, chordata and echinodermata belong to deuterostomes.

298. Flame cells in Planaria constitute the:

• A. Mechanoreceptors
• B. Reproductive system
• C. Respiratory system
• D. Excretory system

Explanation: The excretory system consists of branching tubes ending in bulb-like cells, the flame cells.

299. Which of the following is not associated to exoskeleton of arthropods?

• A. Non-living
• B. Secreted by endodermis
• C. Acellular
• D. Polysaccharide in nature

Explanation: The exoskeleton is secreted by a layer of cells called the epidermis, which is located beneath the existing exoskeleton. As the arthropod grows, it molts or sheds its old exoskeleton in a process called ecdysis and secretes a new, larger exoskeleton to accommodate its increased size.

300. Which of the following is incorrect about annelida?

• A. Triploblastic organisation.
• B. Bilateral symmetry
• C. Segmentation
• D. Pseudocoelom

Explanation: Pseudocoelom is not possessed by annelida. It is the major characteristic of phylum nematoda.