MCQ'S: Animal Kingdom By: Aprajita shankhdhar
1.Which of the following statements is without exception for sponges? . (a) they all have calcareous spicules .(b) they have high regenerative power .(c) they are found only in marine water .(d) they are all radially symmetrical.
2.Most appropriate term to describe the life cycle of Obelia is . (a) metamorphosis . (b) neoteny .(c) metagenesis .(d) all of these.
-3,which of the following is not found in birds? * (a) pelvic girdle (b) pectoral girdle . (c) hind limb . (d) for limb.
.4 .Aquatic reptiles are . (a) ureotelic . (b) Ureotelic in water .(c) ammonotelic . (d) ureotelic over land
5. What is true for mammalia? (a) Platypus is oviparous . (b) bats have feather . (c) elephant is ovoviviparous .(d) diaphragm is absent in them.
.6.Which of the following characters is absent in all chordates? (a) diaphragm *(b) coelom .(c) pharyngeal gill clefts . (d) dorsal nerve cord
. In which of the following, notochord is present in embryonic stage? . (a) all chordates . (b) some chordates . (c) vertebrates . (d) non chordates.
.1 . b): Sponges may have calcareous or siliceous spicules. All sponges are not marine, some are freshwater living also. Sponges may be asymmetrical or bilaterally symmetrical, besides being radially symmetrical. So, these characters are with exception. The character without exception is the regenerative power of sponges.
2.C .(c): Obelia belongs to the phylum coelenterata. In Obelia, life-cycle includes two clearly defined phases: A fixed polypoid phase (hydroid colony) and a pelagic medusoid phase. Hydroid colony has no gonads and reproduces by asexual budding to give rise to medusae. On the other hand, medusae reproduce exclusively by sexual method (ova and sperms) to give rise to new hydroid colonies. This fact apparently seems to have given rise to the idea of alternation of generations, also called metagenesis.
4 .b): The waste material of aquatic reptiles chiefly consists of urea, so they are ureotelic. Land forms are uricotelic i.e., their water material consists of uric acid
6. .(a): Diaphragm is a membrane that separates thoracic cavity from abdominal cavity. It is present only in mammals. All other chordates do not have diaphragm as their body cavity is not divided into thoracic and abdominal cavities. Chordates are coelomate animals having a true coelom, entercoelicand shizocoelic irn origin. Pharyngeal gill slits are present at some stage, may or may not be functional. Nerve cord is dorsal and tubular.
Loves teaching and tries to simplify teaching learning process as much as possible by my side NEET \ AIIMS \ CTET.