Change in the number of body parts is called
Continuous variation
Discontinuous variation
Meristic variation
Substantive variation
C.
Meristic variation
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.
Branch of zoology dealing with the study of fishes is called
Arthrology
Ichthyology
Saurology
Herpetology
B.
Ichthyology
Branch of Zoology | Area |
Arthrology | Study of Joints |
Ichthyology | Study of Fishes |
Saurology | Study of Lizards |
Herpetology | Study of Reptiles |
Which is regarded as the urinary bladder of the embryo?
Amnion
Allantois
Chorion
Yolk sac
B.
Allantois
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.
Which is common to kidney and skeleton in mammals?
Cortex
Medulla
Pelvis
Radius
C.
Pelvis
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.
Urea synthesis occurs in
kidney
Liver
Brain
Muscles
B.
Liver
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.
Blood is a kind of
Areolar tissue
Connective tissue
Fluid connective tissue
Reticular connective tissue
B.
Connective tissue
Blood is a living, vascular, fluid connective tissue, which is made of 60% plasma, 40% of blood cells and platelets.
The most primitive vertebrates are
Ostracoderms
Cephalochordates
Placoderms
Cyclostomes
A.
Ostracoderms
Class-Ostracodermi of vertebrata includes most primitive vertebrates, e.g., Cephalaspis and Drepanaspis.
The most active phagocytic white blood cells are
Neutrophils and eosinophils
Lymphocytes and macrophages
Eosinophils and lymphocyte
Neutrophils and monocytes
D.
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.
Deficiency of vitamin -B12 causes
Cheilosis
Thalassemia
Beri-Beri
Pernicious Anaemia
D.
Pernicious Anaemia
The deficiency (hypovitaminosis) of vitamin-B12 or cyanocobalamine causes pernicious anaemia, demyelination of nerve fibres and glossitis (inflammation of tongue).
Theory of continuity of germplasm was propounded by
Mendel
Lamarck
Weismann
Haeckel
C.
Weismann
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.