CBSE
Multiple Choice QuestionsSix highly chitinous plate-like teeth are found in ……. of cockroach
Mandible
Gizzard
Mexilla
Rectum
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
Myelin sheath is produced by
Schwann Cells and Oligodendrocytes
Astrocytes and Schwann Cells
Oligodendrocytes and Osteoclasts
Oligodendrocytes and Osteoclasts
MALT constitutes about ___________ percent of the lymphoid tissue in human body.
50%
20%
70%
70%
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
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
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
Receptor sites for neurotransmitters are present on
Membranes of synaptic vesicles
Pre-synaptic membrane
Tips of axons
Tips of axons
Areolar connective tissue joins
fat body with muscles
integument with muscles
bones with muscles
bones with muscles
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
