The most primitive vertebrates are
Class-Ostracodermi of vertebrata includes most primitive vertebrates, e.g., Cephalaspis and Drepanaspis.
Theory of continuity of germplasm was propounded by
Theory of continuity of germplasm was proposed by August Weismann (1892), a German Biologist, he suggested that the changes occurring in germplasm are inherited by offsprings, whereas in somatoplasm are not transmitted to next generation.
Deficiency of vitamin -B12 causes
The deficiency (hypovitaminosis) of vitamin-B12 or cyanocobalamine causes pernicious anaemia, demyelination of nerve fibres and glossitis (inflammation of tongue).
The most active phagocytic white blood cells are
Neutrophils and eosinophils
Lymphocytes and macrophages
Eosinophils and lymphocyte
Neutrophils and monocytes
Neutrophils and monocytes
Neutrophils are most abundant granulecytes which engulf microbes by phagocytosis. These have 2-7 lobulated nucleus and do not stain any basic or acidic dye monocytes are large sized leucocytes, which are highly motile and phagocytic in nature.
Which is common to kidney and skeleton in mammals?
The term 'pelvis' is common to both kidney and skeleton in mammals. In relation to the kidney, it can be described as a chamber in the kidney into which the urine drains from renal tubules before passing to the ureter. For skeleton, it is related with a pelvic girdle or hip girdle.
Blood is a kind of
Fluid connective tissue
Reticular connective tissue
Blood is a living, vascular, fluid connective tissue, which is made of 60% plasma, 40% of blood cells and platelets.
Which is regarded as the urinary bladder of the embryo?
Allantois is an extraembryonic membrane developed as an outgrowth from hindgut. In the eggs of reptiles and birds, it functions as a urinary bladder and stores the waste excretory products. It also provides oxygen (in reptiles, birds and mammals) and food (in mammals) to the embryo.
Branch of zoology dealing with the study of fishes is called
|Branch of Zoology||Area|
|Arthrology||Study of Joints|
|Ichthyology||Study of Fishes|
|Saurology||Study of Lizards|
|Herpetology||Study of Reptiles|
Urea synthesis occurs in
The formation of urea from NH3, and CO2 Occurs in the liver. Through Ornithine cycle or Krebs Hansleit cycle. All the steps of this cycle are enzymatic and can be visualized as follows.
Change in the number of body parts is called
Meristic variations involve any change in the number of body parts. In other words, it may be defined as the numerical variation in the taxonomic characters, e.g., number of spots, vertebrae, etc.