NEET 2020 - Biology Questions and Answers (41-50)

 41. Match the following columns and select the correct option.

Column-I                                                 Column-II

(a) Bt cotton                                           (i) Gene therapy

(b) Adenosine deaminase deficiency   (ii) Cellular defence

 (c) RNAi                                               (iii)Detection of HIV infection

(d) PCR                                                 (iv) Bacillus thuringiensis

(a) (b) (c) (d)

(1) (iii) (ii) (i) (iv)

(2) (ii) (iii) (iv) (i)

(3) (i) (ii) (iii) (iv)

(4) (iv) (i) (ii) (iii)

42. Flippers of Penguins and Dolphins are examples of

(1) Convergent evolution

(2) Industrial melanism

(3) Natural selection

(4) Adaptive radiation

43. The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of

(1) 1 molecule of 3-C compound

(2) 1 molecule of 6-C compound

(3) 1 molecule of 4-C compound and 1 molecule of 2-C compound

(4) 2 molecules of 3-C compound

44. The infectious stage of Plasmodium that enters the human body is

(1) Sporozoites

(2) Female gametocytes

(3) Male gametocytes

(4) Trophozoites

45. Identify the incorrect statement.

(1) Sapwood is involved in conduction of water and minerals from root to leaf

(2) Sapwood is the innermost secondary xylem and is lighter in colour

(3) Due to deposition of tannins, resins, oils etc., heart wood is dark in colour

(4) Heart wood does not conduct water but gives mechanical support

46. Which of the following is correct about viroids?

(1) They have free RNA without protein coat

(2) They have DNA with protein coat

(3) They have free DNA without protein coat

(4) They have RNA with protein coat

47. Match the following diseases with the causative organism and select the correct option.

Column-I      Column-II

(a) Typhoid (i) Wuchereria

(b) Pneumonia (ii) Plasmodium

(c) Filariasis (iii)Salmonella

(d) Malaria (iv) Haemophilus

    (a) (b) (c) (d)

(1) (iii) (iv) (i) (ii)

(2) (ii) (i) (iii) (iv)

(3) (iv) (i) (ii) (iii)

(4) (i) (iii) (ii) (iv)

48.  If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 109 bp, then the length of the DNA is approximately

(1) 2.5 meters

(2) 2.2 meters

(3) 2.7 meters

(4) 2.0 meters

49.According to Robert May, the global species diversity is about

(1) 20 million 

(2) 50 million

(3) 7 million 

(4) 1.5 million

50. The QRS complex in a standard ECG represents

(1) Depolarisation of auricles

(2) Depolarisation of ventricles

(3) Repolarisation of ventricles

(4) Repolarisation of auricles


41. (4) (iv) (i) (ii) (iii)

42. (1) Convergent evolution

43. (1) 1 molecule of 3-C compound

44. (1) Sporozoites

45. (2) Sapwood is the innermost secondary xylem and is lighter in colour

46. (1) They have free RNA without protein coat

47. (1) (iii) (iv) (i) (ii)

48. (2) 2.2 meters

49. (3) 7 million 

50. (2) Depolarisation of ventricles

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