Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

The most primitive vertebrates are

  • Ostracoderms

  • Cephalochordates

  • Placoderms

  • Cyclostomes


A.

Ostracoderms

Class-Ostracodermi of vertebrata includes most primitive vertebrates, e.g., Cephalaspis and Drepanaspis.


12.

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).


13.

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.


14.

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.


15.

 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.


16.

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.


17.

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.


18.

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.


19.

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

20.

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.