MCQ'S: Animal Kingdom By: Aprajita shankhdhar
1. The animals with bilateral symmetry in young stage, and radial pentamerous symmetry in the adult stage, belong to the phylum (a) annelida .(b) mollusca .(c) cnidaria . (d) echinodermata
.2 . In contrast to annelids the platyhelminthes show .(a) absence of body cavity . (b) bilateral symmetry .(c) radial symmetry .(d) presence of pseudocoel.
3. . What is common between parrot, platypus and kangaroo? (a) toothless jaws (b) functional post-anal tail . (c) ovoparity .(d) homoiothermy.
4. .Which one of the following characters is not typical of the class mammalia? . (a) thecodont dentition . (b) alveolar lungs .(c) ten pairs of cranial nerves .(d) seven cervical vertebrae.
5. In Arthropoda, head and thorax are often use to form cephalothorax, but in which one of the following classes, is the body divided into head thorax and abdomen? . (a) insecta (b) myriapoda .(c) crustacea . (d) arachnida and curstacea
.6 . Presence of gills in the tadpole of frog indicates that (a) fish were amphibious in the past .(b) fish evolved from frog-like ancestors .(c) frogs will have gills in future .(d) frogs evolved from gilled ancestors.
.7 When a fresh-water protozoan possessing a contractile vacuole, is placed in a glass containing marine water, the vacuole will (a) increase in number .(b) disappear .(c) increase in size (d) decrease in size
.8 . In which of the following animals, haemocyanin pigment is found (a) annelid .(b) echinodermata .(c) insecta *(d) mollusca
1. .d): Echinoderms are triploblastic animals with organ system level of organisation. Larval forms possess bilateral symmetry while adults have radial symmetry
3. .d): 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: 36-38 C in mammals and 38-40 C in birds. The hypothalamus in the brain monitors blood temperature and controls thermoregulation by both nervous and hormonal means. Thus parrot (bird) and platypus and kangaroo (mammals) are homoiothermic animals.
5. .a): Body in arthropoda is segmented .Segments are grouped into 3 forms - head, thorax and abdomen. When head and thorax are fused then they are referred to as cephalothorax. . Class insecta of arthropoda phylum have body divided into head, thorax and abdomen.
8. .(d): In molluscs, blood often has a copper- containing, In insects, the blood called haemolymph is colourless. In In annelids, the blood is red with haemoglobin dissolved blue respiratory pigment called haemocyanin. echinodermates, blood is colourless as it has no respiratory pigment. in plasma
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