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NEET - September 2020 Previous Year Questions



NEET Biology Previous Year Questions - September 2020

The process of growth is maximum during:

[class-xi ]

  • Log phase
  • Lag phase
  • Senescence
  • Dormancy
  • Correct Option: A  [ Log phase ]

    Remark:

Name the plant growth regulator which upon spraying on sugarcane crop, increases the length of stem, thus increasing the yield of sugarcane crop.

[class-xi ]

  • Cytokinin
  • Gibberellin
  • Ethylene
  • Abscisic acid
  • Correct Option: B  [ Gibberellin ]

    Remark:

Identify the correct statement with reference to human digestive system.

[class-xi ]

  • Ileum opens into small intestine.
  • Serosa is the innermost layer of the alimentary canal.
  • Ileum is a highly coiled part.
  • Vermiform appendix arises from duodenum.
  • Correct Option: C  [ Ileum is a highly coiled part. ]

    Remark:

The enzyme enterokinase helps in conversion of:

[class-xi ]

  • protein into polypeptides
  • trypsinogen into trypsin
  • caseinogen into casein
  • pepsinogen into pepsin
  • Correct Option: B  [ trypsinogen into trypsin ]

    Remark:

Select the correct events that occur during inspiration.
A. Contraction of diaphragm
B. Contraction of external inter-costal muscles
C. Pulmonary volume decreases
D. Intra pulmonary pressure increases

[class-xi ]

  • (A) and (B)
  • (C) and (D)
  • (A), (B) and (D)
  • only (D)
  • Correct Option: A  [ (A) and (B) ]

    Remark:

Identify the wrong statement with reference to transport of oxygen.

[class-xi ]

  • Binding of oxygen with haemoglobin is mainly related to partial pressure of O2.
  • Partial pressure of CO2 can interfere with O2 binding with haemoglobin.
  • Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin.
  • Low pCO2 in alveoli favours the formation of oxyhaemoglobin.
  • Correct Option: C  [ Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin. ]

    Remark:

Match the following columns and select the correct option.

Column-I Column-II
(A)Eosinophils (I)Immune response
(B)Basophils (II)Phagocytosis
(C)Neutrophils (III)Release histaminase, destructive enzymes
(D)Lymphocytes (IV)Release granules containing histamine

[class-xi ]

  • (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
  • (A)-(IV), (B)-(I) (C)-(II), (D)-(III)
  • (A)-(I), (B)-(II, (C)-(IV), (D)-(III)
  • (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
  • Correct Option: A  [ (A)-(III), (B)-(IV), (C)-(II), (D)-(I) ]

    Remark:

The QRS complex in a standard ECG represents:

[class-xi ]

  • Repolarisation of auricles
  • Depolarisation of auricles
  • Depolarisation of ventricles
  • Repolarisation of ventricles
  • Correct Option: C  [ Depolarisation of ventricles ]

    Remark:

Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?

[class-xi ]

  • Uremia and Ketonuria
  • Uremia and Renal Calculi
  • Ketonuria and Glycosuria
  • Renal calculi and Hyperglycaemia
  • Correct Option: C  [ Ketonuria and Glycosuria ]

    Remark:

Which of the following would help in prevention of diuresis?

[class-xi ]

  • More water reabsorption due to undersecretion of ADH
  • Reabsorption of Na+ and water from renal tubules due to aldosterone
  • Atrial natriuretic factor causes vasoconstriction
  • Decrease in secretion of renin by JG cells
  • Correct Option: B  [ Reabsorption of Na+ and water from renal tubules due to aldosterone ]

    Remark: