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
Answers:
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