Which of the following does not come under the Class Mammals?
Flying fox
Hedgehog
Manatee
Lamprey
D.
Lamprey
Lamprey (or Petromyzon) belongs to class cyclostomata. The lamprey has about 1m long greenish brown, cylindrical body with smooth, scaleless, slimy skin; anterior circular, jawless mouth; a single dorsal naris; seven pairs of circular gill slits; 2 dorsal tins and a tail tin. It's life cycle includes two quite different phases. The larval phase (called ammocoete) is a fresh water sedentary, filter feeding and microphagus creature reminiscent of the lancet. The fish like adult lives in the sea and is parasitic on fishes.
During the life-cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively
redia and miracidium
cercaria and redia
metacercaria and cercaria
miracidium and metacercaria.
A lizard-like member of reptilia is sitting on a tree with its tail coiled around a twig. This animal could be
Hemidactylus showing sexual dimorphism
Varamus showing mimicry
garden lizard (Calotes) showing camouflage
Chamaeleon showing protective colouration
Which one of the following features is common in silverfish, scorpion, dragonfly and prawn?
Two pairs of legs and segmented body
Living chitinous cuticle and two pairs of antennae
Jointed appendages and chitinous exoskeleton
Closed blood carcular system
Which one of the following animals is correctly matched with its one characteristic and the taxon
| Animal | Characteristic | Taxon |
| Millipede | Ventral nerve cord | Arachnida |
| Duckbill platypus | Oviparous | Mammalia |
| Silverfish | Pectoral and pelvic fin | Chordata |
| Sea anemone | Triploblastic | Cnidaria |
All mammals without any exception are characterised by
viviparity and biconcave red blood cells
extra-abdominal testes and a four chambered heart
heterodont teeth and 12 pairs of cranial nerves
a muscular diaphragm and milk producing
glands.
Assertion : Torison can be seen in ctenidium.
Reason : Ctenidium acts as the respiratory organ.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
Which one of the following pairs of the kind of cells and their secretion is correctly matched
| Oxyntic cells | a secretion with pH between 2.0 and 3.0 |
| Alpha cells of islets of Langerhans | secretion that decreases blood sugar level |
| Kupffer cells | a digestive enzyme that hydrolyses nucleic acids |
| Sebaceous glands | a secretion that evaporates for cooling |
Assertion: Blood in cockroach is colourless haemolymph with no respiratory pigment.
Reason: Respiration in cockroach occurs through diffusion in haemolymph.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Assertion: Cephalization is advantageous to an animal.
Reason: It improves the appearance of the animal
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
