Urea synthesis occurs in

• kidney

• Liver

• Brain

• Muscles

Which is common to kidney and skeleton in mammals?

• Cortex

• Medulla

• Pelvis

• Radius

13.

Which is regarded as the urinary bladder of the embryo?

• Amnion

• Allantois

• Chorion

• Yolk sac

Deficiency of vitamin -B₁₂ causes

• Cheilosis

• Thalassemia

• Beri-Beri

• Pernicious Anaemia

 Blood is a kind of

• Areolar tissue

• Connective tissue

• Fluid connective tissue

• Reticular connective tissue

The most primitive vertebrates are

• Ostracoderms

• Cephalochordates

• Placoderms

• Cyclostomes

Change in the number of body parts is called

• Continuous variation

• Discontinuous variation

• Meristic variation

• Substantive variation

Branch of zoology dealing with the study of fishes is called

• Arthrology

• Ichthyology

• Saurology

• Herpetology

Theory of continuity of germplasm was propounded by

• Mendel

• Lamarck

• Weismann

• Haeckel

The most active phagocytic white blood cells are

• Neutrophils and eosinophils

• Lymphocytes and macrophages

• Eosinophils and lymphocyte

• Neutrophils and monocytes