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Structural Organisation In Animals

Multiple Choice Questions

31.

Which of the following pairs are correctly matched?
Animals Morphological features
(i) Crocodile - 4-chambered heart
(ii) Sea urchin - Parapodia
(iii) Obelia - Thecodont
(iv) Lemur - Thecodont

A, C and D
B, C and D
Only A and D
Only A and D

542 Views

32.

What is true about Nereis, Scorpion, Cockroach and Silver fish?

They all have jointed paired appendages
They all possess dorsal heart
None of them is aquatic
None of them is aquatic

580 Views

33.

Areolar connective tissue joins

fat body with muscles
integument with muscles
bones with muscles
bones with muscles

427 Views

34.

Earthworms are

ureotelic when plenty of water is available
ureotelic when plenty of water is available
uricotelic under conditions of water scarcity
uricotelic under conditions of water scarcity

544 Views

35.

Select the correct route for the passage of sperms in male frogs :

Testes - Bidder's canal - Kidney - Vasa
efferentia - Urinogenital duct - Cloaca
Testes - Vasa efferentia - Kidney - Seminal
Vesicle - Urinogenital duct - Cloaca
Testes - Vasa efferentia - Bidder's canal -
Ureter - Cloaca
Testes - Vasa efferentia - Bidder's canal -
Ureter - Cloaca

1397 Views

36.

MALT constitutes about ___________ percent of the lymphoid tissue in human body.

1955 Views

37.

Receptor sites for neurotransmitters are present on

Membranes of synaptic vesicles
Pre-synaptic membrane
Tips of axons
Tips of axons

1074 Views

38.

Myelin sheath is produced by

Schwann Cells and Oligodendrocytes
Astrocytes and Schwann Cells
Oligodendrocytes and Osteoclasts
Oligodendrocytes and Osteoclasts

1069 Views

39.
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

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.