NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


The joint between atlas and axis is called

  • Pivot joint

  • Hinge joint

  • Saddle joints

  • Angular joint


Pivot joint

Axis vertebra possesses a peg-like structure called the odontoid process which projects forward from the centrum. It fits into the cavity of the atlas below the ligament so that it is separated from the neural canal. Such an arrangement gives a pivot joint which allows the head to shake (rotate from one side to the other).


Chondrichthyes is characterised by

  • Placoid scale

  • Ventral mouth

  • Ctenoid scale and ventral mouth

  • Placoid scale and ventral mouth


Placoid scale and ventral mouth

Chondrichthyes is one of the classes of super-class-Pisces, sub-phylum-Vertebrata and phylum Chordata. The members of class-Chondrichthyes are marine animals with a streamlined body and have a cartilaginous endoskeleton. Mouth is located ventrally. The skin is tough, containing minute placoid scales. The teeth are modified placoid scales which are backwardly directed, e.g., Dog fish (Scoliodon), sawfish (Pristis), great white shark (Carcharodorus sting ray (Trygon), etc.


Which cranial nerve has the highest number of branches?

  • Facial nerve

  • Trigeminal

  • Vagus nerve

  • None of these


Vagus nerve

Vagus nerve has five branches:

(i) Superior laryngeal nerve
(ii) Recurrent laryngeal nerve
(iii) Cardiac nerve
(iv) Pneumogastric nerve
(v) Depresser nerve


The blood group with antibody-a and antibody-b is

  • B

  • A

  • O

  • AB



Persons having blood group - O has no antigens but have both antibodies a and b in their plasma.


Vetebrate brain differentiates from

  • Endoderm

  • Mesoderm

  • Ectoderm

  • Blastoderm



The brain is the centre of the nervous system in all vertebrates and most invertebrate animals. The neural plate of ectoderm forms the brain, spinal cord and nerves.


The junction between the axon of one neuron and the dendrite of the next is called

  • Junction point

  • A synapse

  • A joint

  • Constant bridge


A synapse

The end-to-end position of the axon of the one neuron and the dendrites of another neuron called synapse.

Most neutrons do not actually touch other neurons with which they communicate, instead, there is a minute space, separating these two called the synaptic cleft.


The problem due to Rh factor arises when the blood of two (Rh and Rh) mixup

  • During Pregnancy

  • Through transfusion

  • In a test tube

  • Both (a) and (b)


Both (a) and (b)

Landsteiner and Weiner (1940) discovered Rh antigens in the rhesus monkey. Now, it is found in most human beings. A human with this factor are said to be Rh and humans without this factor are said to be Rh The problem due to Rh incompatibility arises when the blood of Rh person and Rh women mix up during pregnancy or through blood transfusion.


Rate of heart beat is determined by

  • Purkinje Fibres

  • Papillary muscles

  • SA-node

  • AV-node



The contraction of heart depends on small cluster of specialised muscle cells which are embedded in the upper wall of the right atrium. This cluster of cells is called the sino-atrial node (SA-node). It automatically and rhythmically sends out impulses that initiate each heart beat.


The stratified epithelium is found in

  • Seminiferous tubule

  • Fallopian tube

  • Nasal cavity

  • Kidney tubules


Nasal cavity

Epithelium made up of a series of layers is called stratified epithelium. The cells of each layer vary in size and shape. It is also called laminated epithelium. It is found in olfactory region of the nasal cavity and contains the receptors for the sense of smell.


Dead space air in man is

  • 500 ml

  • 150 ml

  • 250 ml

  • 1.5 L


150 ml

Dead space is the air that is inhaled by the body in breathing but does not take part in gas exchange. In man, it is 150 mL.