Multiple Choice QuestionsMyelin sheath is produced by
Schwann Cells and Oligodendrocytes
Astrocytes and Schwann Cells
Oligodendrocytes and Osteoclasts
Oligodendrocytes and Osteoclasts
Which one of the following in birds, indicates, their reptilian ancestry?
Scales on their hindlimbs
Four-chambered heart
Two special chambers crop and gizzard in their digestive tract
Eggs with a calcareous shell
C.
Two special chambers crop and gizzard in their digestive tract
Nearly a century ago TH Huxley called birds 'glorified reptiles' thereby meaning that birds have evolved from some reptilian ancestor. Both birds and reptiles lay the same type of eggs, which are deposited outside water. Eggs are large and telolecithal. The ovum is surrounded by albumen, an egg membrane and a thick hard calcareous shell, which are all secreted by special gland located int he walls of oviduct.
Birds like mammals have completely four chambered heart with double circulation, in which there is no mixing of pure and impure bloods. Whereas the ventricle is imperfectly divided in reptiles, resulting in partial mixing of bloods.
All birds have horny epidermal scales confined to the lower parts of their legs and feet, which are exactly like the epidermal scales of the reptiles. Besides birds are covered by feathers, which are homologous to the reptilian horny scales as they have a similar origin and develop from similar germ buds.
Six highly chitinous plate-like teeth are found in ……. of cockroach
Mandible
Gizzard
Mexilla
Rectum
Organisms who are able to freely interbreed producing fertile off-springs and having a similar blueprint for making these organisms are referred to as
Species
Tribe
Genus
Sub-genus
The stratified epithelium is found in
Seminiferous tubule
Fallopian tube
Nasal cavity
Kidney tubules
The blood of cockroach contains no respiratory pigment. It means that
respiration is anaerobic
cockroach does not respire
oxygen goes directly into tissues by diffusion
oxygen goes into tissue by intracellular capillary system
Which is common between earthworm, leech and centipede?
They have Malphigian tubules
They are hermaphrodite
They have ventral nerve cord
None of the above
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