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

103.

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 basic unit of classification is

• Species

• Genus

• Family

• Phylum

In most fungi, cell wall is chiefly made of

• Cellulose

• Chitin

• Protein

• Lipid

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

Sciatic vein of frog opens in

• heart

• kidney

• pelvic region

• liver

Which is common between earthworm, leech and centipede?

• They have Malphigian tubules

• They are hermaphrodite

• They have ventral nerve cord

• None of the above