Myelin 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

Areolar connective tissue joins

• fat body with muscles

• integument with muscles

• bones with muscles

• bones with muscles

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

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

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

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

• 50%

• 20%

• 70%

• 70%

Six highly chitinous plate-like teeth are found in ……. of cockroach

• Mandible

• Gizzard

• Mexilla

• Rectum

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 

Receptor sites for neurotransmitters are present on

• Membranes of synaptic vesicles

• Pre-synaptic membrane

• Tips of axons

• Tips of axons