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

Which of the following amino acids is not optically active?

• Glycine

• Valine

• Leucine

• Isoleucine

'Adaptation' of eyes in dark is due to

• depletionof vision pigment in rods

• depletion of vision pigment in cones

• repletion of vision pigment in rods

• repletion of vision pigment in cones

Human ear ossicles are

• incus and stapes

• stapes

• incus, malleus and stapes

• incus and malleus

During strenuous excercise, glucose is converted into

• glycogen

• pyruvic acid

• starch

• lactic acid

Follicle Stimulating Hormone is secreted by

• anterior lobe of pituitary

• hypothalamus

• gonads

• poterior lobe of pituitary

Tube feet is the locomotory organ in 

• starfish

• jelly fish

• silver fish

• Scoliodon

The echinoderms are

• arborial insects

• marine animals

• terrestrial insects

• freshwater forms

Which of the following vitamins is water soluble as well as an antioxidant?

• Vitamin- B₁

• Vitamin-A

• Vitamin-D

• Vitamin-C

Which part of an animal virus is not reproduced in multiple copies?

• Capsid

• Protein

• Envelope

• Ribosome