NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


Adrenaline and noradrenaline are hormones that act as

  • Energy producing agents

  • Food storage materials

  • Neurotransmitters

  • Energy storing substances



There are four neurotransmitters identified in vertebrates acetylcholine, serotonin, adrenaline and noradrenaline.


In the following diagram showing axon terminal and synapse A, B, C, D and E respectively represent

  • A-axon terminal, B-synaptic cleft, C-synaptic vesicles, D-neurotransmitters, E-receptors

  • A- axon terminal, B-synaptic vesicles, C-synaptic cleft, D-receptors, E-neurotransmitters

  •  A-synaptic cleft, B-synaptic vesicles, C-axon terminal, D-neurotransmitters, E-receptors

  •  A-synaptic vesicles, B-axon terminal, C-synaptic vesicles, D-neurotransmitters, E-receptors


A- axon terminal, B-synaptic vesicles, C-synaptic cleft, D-receptors, E-neurotransmitters


 Steroid hormones work as

  • They enter into target cells and binds with specific receptor and ativate4s specific genes to form protein

  • They bind to cell membrane

  • They catalyse formation of cAMP

  •  None of the above


They bind to cell membrane

A steroid hormone is lipid soluble, so easily pass through the plasma membrane.


Rh-factor can produce disease

  • AIDS

  • Tumer’s syndrome

  • Erythroblastosis foetalis

  • Sickle cell anaemia


Erythroblastosis foetalis

Erythroblastosis is a haemolytic disease of newborns. It occurs when father le Rh positive and mother Rh-negative.


Food storage in Leucosolenia occur by

  • Ostia

  • Osculam

  • Thesocyte

  • Spongocoel



It occurs by thesocyte which have lobose pseudopodia and are filled with food reserves, thus acting as storage cells.


Penumotoxic centre which a moderate the function of the respiratory rhythm centre is present at

  • Pons region in brain

  • Thalamus

  • Spinal cord

  • Right cerebral hemisphere


Pons region in brain

Pneumotoxic centre which can moderate the functions of the respiratory rhythm centre is present in the pons region of the brain Neural signals from this centre can reduce the duration of inspiration and thereby alter the respiration rate.


Which of the following disorder is an outcome of irregularities in the metabolism of the nitrogenous waste?

  • Osteoporosis

  • Gouty Arthritis

  • Osteoarthritis

  • Rheumatoid arthritis


Gouty Arthritis

Uric acid, a normal waste product of nucleic acid metabolism gets excreted normally through urine. When over concentration in blood, it gets deposited in the form of crystals in joints causing gouty arthritis.


Which of the following hormone secretes a gastric secretion?

  • Entero gastrone

  • Gastrin

  • CCK-PZ

  • Villikinin



Gastrin hormone is secreted by gastric glands to release gastric juice. Enterogastrone is secreted by the duodenal epithelium which inhibits the secretion of gastric juice.


Which type of cells is absent in sponges?

  • Trophocytes

  • Myocytes

  • Archeocytes

  • Cnidocytes



Cnidocytes or stinging cells are spherical or oval cells found in entire epidermis except that of basal disc and are found only in cnidarians other cells are found in sponges.


During urine formation, which of the following process create thigh osmotic pressure in the uriniferous tubule?

  • Active Na+ absorption, followed by absorption of Cl

  • Active Cl absorption, followed by absorption of Na+

  • Active secretion of Na+ into efferent arteriole followed by absorption of Cl into the efferent renal arteriole

  • Active secretion of Cl and absorption of Nainto the efferent renal arteriole


Active Na+ absorption, followed by absorption of Cl

Osmotic pressure is a measure of tendency to take water by osmosis. During urine formation, 2/3 of Nacl and water filtered in bowman's capsule, is immediately absorbed by PCT.