In DNA, which is absent

• Adenine

• Thymine

• Guanine

• Uracil

Blood leaving liver and going towards heart is rich in

• bile

• urea

• ammonia

• oxygen

Digestion' word means

• burning of food

• oxidation of food

• hydrolysis of food

• oxidation of food

Maximum absorption of water occurs in

• colon 

• rectum

• large intestine

• small intestine

Chloragogen cells of earthworms are analogous to vertebrate

• lungs

• liver

• gut

• kidneys

Class Crustacea differs from lnsecta in having

• two pairs of antennae

• jointed foot

• chitinous cuticle

• none of the above

Neural canal is present in

•  humerus

•  tibia-fibula

• vertebral column

•  cranial bones

Sigmoid notch is formed by

• cavity formed by humerus

• cavity formed by radius-ulna

• cavity formed by tibia-fibula

• cavity formed by femur

Which of the following character is present essentialy in chordates 

• Ventral spinal chord

• Dorsal heart

•  Pharyngeal gill slits

• Blood flow in forward direction in ventral blood vessels

If dorsal nerve of spinal cord is broken down then its effect is

• no impulse is transmitted

• impulse is transmitted but slowly

• impulse is transmitted fast

• no effect on impulse