Arbor-vitae is composed of

• grey matter

• neurogleal cells

• white matter

• all of the the above

The main difference between white and yellow fibres is of

• protein

• colour of fibres

• both (a) and (b)

• none of the above

Lenticular transpiration takes place in

• fruits

• woody stems

• leaves

• all of these

44.

Which of the following is not found in vertebrates

• Bilateral symmetry

• Gill opening

• Body scales

• Cnidoblasts

In which of the following process 36 ATP molecules are produced by per hexose molecule

• Glycolysis

• Krebs' cycle

• Direct oxidation pathway

• None of the above

The value of RQ at compensation point is

• unity

• infinity

• > 1 

• zero

The vitamin present in Coenzyme is

• B₂

• niacin

• pyridoxine

• pantothenic acid

Symbiotic bacteria present in intestine of most primates, which synthesize certain vitamins are

• Entamoeba histolytic

• Entamoeba coli

• Entamoeba gingivali

• None of the above

In which form CO₂ is mostly carried by blood

•  bicarbonate

• carbonic acid

• Carbamino compound

• Carboxyhaemoglobin

Which artery is absent in frog

• Right systemic arch

• Phrenic artery

• Carotid artery

• Renal artery