Free Kingdom Animalia MCQs with Answers

451. Centipedes belong to which class of arthropods?

• A. Arachnida
• B. Insecta
• C. Myriapoda
• D. Cephalopoda

Explanation: Centipedes belong to the class Myriapoda of Arthropoda. (myriapoda= many-legs)

452. Which of the following is not found in series protostomia?

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

Explanation: The correct answer for this is "Echinodermata". Echinoderms, Chordates and Hemichordates all belong to deuterostomes which means that their anus develops first, while "Annelids", "Arthropods", and "Molluscs" are protostomes.

453. Which of the following is an example of a tetrapod?

• A. Flesh fly
• B. Blue-ringed octopus
• C. Tarantula
• D. Hummingbird

Explanation: Tetrapods are a superclass of animals that include all four limbed vertebrates (backboned animals) constituting the classes Amphibia (amphibians), Reptilia (reptiles), Aves (birds), Mammalia (mammals), and their direct ancestors.In the question, "Octopus" belongs to invertebrate phylum of Mollusca while tarantula and "flesh fly" belong to invertebrates arthropods so the correct option is "humming bird" belonging to class aves of vertebrates.

454. The fate of each blastomere is foretold. What will that cleavage be?

• A. Spiral and indeterminate
• B. Radial and indeterminate
• C. Radial and determinate
• D. Spiral and determinate

Explanation: A spiral and determinate cleavage is that in which the lines or planes of cleavage are not symmetrical between poles instead these are diagonal to the polar axis and produce unequal cells around the axis of polarity and all the blastomeres have determined role to play in the formations of embryo. The fate of each blastomere is foretold.

455. Which of the following is an oviparous animal?

• A. Pigeon
• B. Elephant
• C. Sheep
• D. Humans

Explanation: Sheep, 'elephants, and humans are all viviparous, In viviparity, the individual doesn't lay eggs and the embryo is formed inside the maternal body. 'Pigeon' is the only option here that's oviparous meaning it lays eggs that are hatched outside the body.

456. Which of the following is the first group of invertebrates that have developed a closed circulatory system?

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

Explanation: Annelids are the first and the only non-chordates to have a closed circulatory system.

457. The shell of the egg is leathery in appearance in which of the following?:

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

Explanation: Eggs laid by snakes generally have leathery shells which often adhere to one another. Snake belongs to Class Reptiles so the correct answer is reptiles.

458. Animals like starfish have small groups of neurons in each arm connected to a ring of neurons in the centre. This type of nervous system is called _.

• A. Centralized nervous system
• B. Partially centralized nervous system
• C. Diffuse nervous system
• D. Partially diffuse nervous system

Explanation: The diffuse nervous system is the most primitive nervous system. In the diffuse system, nerve cells are distributed throughout the organism, usually beneath the outer epidermal layer.

459. The skeleton of sponges is made up of which of the following?:

• A. Calcium
• B. Silica
• C. Both A and B
• D. None of these

Explanation: The skeletal structures of sponges are spicules and spongin fibres. Spicules are formed by carbonates of lime or silica in the form of needle-like pieces so, calcium and silica both are correct.

460. The lungs of lungfish are thought to have evolved from _.

• A. The swimbladder of cartilaginous fish
• B. The swimbladder of bony fish
• C. The swimbladder of lobe-finned fish
• D. They evolved independently

Explanation: Lungfish have lungs that are derived from the swim bladder (an organ used for buoyancy in most bony fishes), which is connected to the alimentary tract.