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CTET Sample paper "science Answer 1-2-3"

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1. (B) Cladode is a type of phylloclade consisting of one internode only. These are cylindrical (not fleshy) and are mistaken for leaves.
2. (D) Verticillaster is a complex inflorescence found in the Ocimum sanctum, a member of family Labiatae.
3. (B) 4. (A) 5. (A) 6. (C) 7. (A)
8. (D) Cleistogamy is seen in underground flowers of Commelina bengalensis which are small and inconspicuous. This plant also bears chasmogamous blue flowers above.
9. (B) 10. (C) 11. (A) 12. (A)
13. (C) Short day plant (SDP) requires a relatively short day light period (usually 8-10 hrs.) and a continuous dark period of about 14–16 hours for subsequent flowering.
14. (C) 15. (A) 16. (C) 17. (D) 18. (B)
19. (B)
 Kranz anatomy—It is a typical structure in the leaves of plants that have a C4–pathway of CO2 fixation. The leaves contain a ring of mesophyll cells, containing a few chloroplasts surroundings a sheath of bundle sheath cells having large chloroplasts involved in the Calvin cycle.
20. (B) 21. (D) 22. (C) 23. (C) 24. (B) 25. (D) 26. (A)
27. (D) Acid rain results from the emission into the atmosphere of various pollutant gases in particular sulphur dioxide (SO2) and oxides of nitrogen (NO2), which originate from the burning of fossil fuels and from motor-car exhaust fumes, respectively.
28. (A) 29. (B) 30. (B) 31. (C) 32. (D)
33. (C) The first National Park in India was set up in 1935 in the foot hills of Himalayas and was known as Hailey National Park. It is now known as Corbett National Park.
34. (A) Tobacco mosaic virus (TMV) is a rigid rod-shaped ssRNA-containing virus that causes distortion and blistering of leaves in a wide range of plants.
35. (B) Kingdom Monera includes all prokaryotes. They are basically unicellular but can be mycelial, colonial and filamentous.


36. (A) 37. (A)
38. (B) A striking feature of cnidarians is the high degree of polymorphism often seen in a single species. Two basic types—sessile polyp and free-swimming medusa–occur.
39. (D) 40. (D) 41. (C)
42. (D) Members of Elasmobranchii subclass have no swim (air) bladders.
43. (D) 44. (B) 45. (A) 46. (C) 47. (C) 48. (B) 49. (C)
50. (D) Golgi complex is a part of endomembrane system, which is the system of internal membranes within eukaryotic cells that divide the cell into functional and structural compartments, or organelles.
51. (A) 52. (B)
53. (B) AB blood group in human is an example of codominance in which both the alleles IA
 IB are equally expressed. It means IA IB individuals have a phenotype that is essentially a combination of those shown by individuals with A and B blood groups.
54. (A)
55. (A) A small autosome, chromosome 21, added to the normal complement (47, + 21) causes Down syndrome. This is a trisomic for chromosome 21.
56. (D) 57. (B) 58. (D) 59. (C) 60. (A)
61. (C) The Mesozoic era is often known as the “Golden Age of Reptiles” as these animals, which included the dinosaurs and ichthyosaurs, became dominant lifeform.
62. (B) 63. (D) 64. (A) 65. (B) 66. (A) 67. (A)
68. (D) Restriction enzyme is a class of nucleases originally extracted from the E . coli. Type I restriction enzymes bind to a recognition site of duplex DNA, travel along the molecule and cleave one strand only. Type II cleaves the duplex at specific target site at or near the binding site.
69. (C) 70. (B) 71. (A) 72. (C) 73. (A) 74. (B) 75. (D)

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