Free Kingdom Animalia MCQs with Answers

41. Which of the following pairs are correctly matched? (i) Crocodile & 4 chambered heart (ii) Sea urchin & Parapodia (iii) Obelia & Metagenesis (iv) Lemur & Thecodont

• A. (ii), (iii) and (iv)
• B. Only (i) and (iv)
• C. Only (i) and (ii)
• D. (i), (iii) and (iv)

Explanation: Reptiles have two auricles and a partly divided ventricle except crocodiles which have a four chambered heart. Obelia shows metagenesis i.e., alternation of generations which may be defined as a phenomenon in which diploid asexual phase alternates with haploid sexual phase. Lemur has thecodont teeth i.e., the teeth are embedded in the sockets of the jaw bone.

42. What is common between parrot, platypus and kangaroo?

• A. Toothless jaws
• B. Functional postanal tail
• C. Ovoparity
• D. Homoiothermy

Explanation: Homoiothermy is the maintenance by an animal of its internal body temperature at a relatively constant value by using metabolic processes to counteract fluctuations in the temperature of the environment. Homoiothermy occurs in birds and mammals, which are described as endotherms. The heat produced by their tissue metabolism and the heat lost to the environment are balanced by various means to keep body temperature constant: 36-38ºC in mammals and 38-40ºC in birds. The hypothalamus in the brain monitors blood temperature and controls thermoregulation by both nervous and hormonal means. Thus, parrots (birds), platypuses and kangaroos (mammals) are homoiothermic animals.

43. What is true about Nereis, scorpion, cockroach and silver fish?

• A. They all possess dorsal heart.
• B. None of them is aquatic
• C. They all belong to the same phylum.
• D. They all have jointed paired appendages.

Explanation: Nereis, scorpion, cockroach and silver fish are all invertebrates and thus possess dorsal heart. Nereis is a marine animal while other animals mentioned in the question are terrestrial. Nereis belongs to Phylum Annelida while rest of the animals belong to Phylum Arthropoda. Jointed appendages are present in scorpion, cockroach and silver fish.

44. Two common characters found in centipede, cockroach and crab are:

• A. Book lungs and antennae
• B. compound eyes and anal cerci
• C. Jointed legs and chitinous exoskeleton
• D. Green gland and trachea

Explanation: Centipede, cockroach, and crab all belong to phylum arthropoda which are characterized by jointed legs and chitinous exoskeleton. Arthropods have bilaterally symmetrical and metamerically segmented body with haemocoel and open blood vascular system.

45. In which one of the following sets of animals do all four give birth to their young ones?

• A. Kangaroo, hedgehog, dolphin and loris
• B. Lion, bat, whale and ostrich
• C. Platypus, penguin, bat and hippopotamus
• D. Shrew, bat, cat and kiwi

Explanation: Kangaroo, hedgehog, dolphin and Loris are mammals and thus give brith to young ones. Ostrich and kiwi are brids that lay eggs. Platypus is the most primitive living mammal that lays eggs. Other animals in the options are mammals and give birth to young ones.

46. Which one of the following is not a living fossil?

• A. Peripatus
• B. King crab
• C. Sphenodon
• D. Archaeopteryx

Explanation: The earliest known bird fossil is that of archaeopteryx, two species of which have been found from rocks of Jurassic period of earth's history. The fossil shows that archaeopteryx, was about the size of a crow with skull similar to that of present day birds. It had bony teeth in the jaw socket unlike modem birds which do not have teeth. Jaws extended into a beak and there was a long tail. Each wing had three claws. With the exception of feathers these birds showed resemblance to the dinosaurs (giant reptiles of the past). Many fossils of birds from later eras of earth history have also been found that had teeth. The above evidence suggests that birds evolved from reptilian ancestors. The archaeopteryx and others had characteristic of both reptiles and birds and therefore form a connecting link between the two distinct groups.

47. Annual migration does not occur in the case of:

• A. Arctic tern
• B. Salmon
• C. Siberian crane
• D. Salamander

Explanation: Salamander- These animals do not migrate but when the snow starts to melt and when it rains they tend to go to a warmer place so they hibernate in the underground near to the pond.

48. Metameric segmentation is the characteristic of:

• A. Mollusca and Chordata
• B. Platyhelminthes and Arthropoda
• C. Echinodermata and Annelida
• D. Annelida and Arthropoda.

Explanation: The term metamerism refers to a linear repetition of parts in an animal body. It occurs in three highly organized phyla : Annelida, Arthropoda and Chordata. Each segment is called a metamere, or somite. Segmentation often affects both external and internal structures. Such a condition is called metameric segmentation. In chordates, the segmentation is apparent only in the embryonic stage. In the adult chordates, segmentation is visible in the internal structures, such as vertebrae, ribs, nerves and blood vessels. Other animals have unsegmented bodies.

49. In contrast to annelids the platyhelminthes show :

• A. Absence of body cavity
• B. Bilateral symmetry
• C. Radial symmetry
• D. Presence of pseudocoel

Explanation: Platyhelminthes do not have body cavity so they are acoelomates. In annelids, the body cavity is true and schizocoelous. Both annelids and platyhelminthes have bilateral symmetry.

50. From the following statements select the wrong one:

• A. Prawn has two pairs of antennae
• B. Nematocysts are characteristics of the phylum cnidaria
• C. Millepedes have two pairs of appendages in each segment of the body
• D. Animals belonging to phylum porifera are marine and fresh water

Explanation: Prawns have one pair of antennae, one on either side, just below the antennules. They are sensory, excretory and balancing in function. Antennules are attached on either side, below the bases of eye stalks. They are tactile in function. Nematocysts are present in cnidoblasts that act as organs of offence and defence. Millipedes belong to class myriapoda. They are called thousand leggers because of possession of numerous walking legs. Their body is made up of a small head and 40 trunk segments, each with two pairs of jointed legs. Animals belonging to phylum porifera are mostly marine while a few are freshwater.