Chemistry 175/ Zoology 115/ Botany 115/-
36. Assertion (A) : Flowers are com plete in sub-class Monochlamy-
deae.
Reason (R) : In this sub-class
flowers usually possess only one whorl of perianth, which is sepa- loid.
(A) (B) (C) (D) (E) 37. Assertion (A) : A motor mole-
cule of kinetochore accounts for the movement of daughter chro- mosomes during anaphase of cell division.
Reason (R) : Dyenin found in
kinetochore accounts for the
movement of daughter chromo- somes at anaphase during cell division.
(A) (B) (C) (D) (E) 38. Assertion (A) : All the various
genesofa population make up its gene pool.
Reason (R) : The Hardy-Wein-
berg equilibrium is a constancy of gene pool.
(A) (B) (C) (D) (E) 39. Assertion (A) : Tendrils of plants
such as cacti are leaves modified to protect the plant.
Reason (R) : Storage leaves are
floral leaves that protect develop- ing flowers.
(A) (B) (C) (D) (E) 40. Assertion (A) : Speciation is the
formation of one or more new species from an existing species.
Reason (R): Speciation can take place in two modes based on the geographical relationships of a new species to its ancestral species.
(A) (B) (C) (D) (E)
Physics
1. A line of force in an electric field is the path traced by a unit positive charge, free to move in that field.
—T/F
2. Taking the radius of the earth as 6400 km, its capaci- tance should be 711 μF.
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3. In a Young’s double slit experiment, performed with a source of white light, only black and white fringes are observed.
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4. A current flows in a conductor only when there is an electric field within the conductor.
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5. Across any length segment of a current path in an electric circuit, there must be a potential difference.
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6. The product of magnetic susceptibility and absolute temperature for a paramagnetic substance is a cons- tant.
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7. Anelectric line of force in the x-y plane is given by the
equation x2 + y2 = 1. A particle with unit positive charge, initially at rest at the point x = 1, y = 0, in the x-y plane, will move along the circular line of force.
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8. A substance gives yellow fluorescence when white light is incident in it. It gives no fluorescencewhen red light or infrared rays are incident on it.
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9. All points on the same horizontal must lie in the same plane.
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10. The whole charge of a conductor cannot be trans- ferred to another isolated conductor.
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11. A ring of radius ‘R’ carries a uniformly distributed charge + Q. A point charge – q is placed on the axis
of the ring at a distance 2R from the centre of the ring and released from rest. The particle executes a S.H.M. along the axis of the ring.
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12. The root-mean square speeds of the molecules of different ideal gases at the same temperature are the same.
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13. Snow is better heat insulator than ice.
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14. Equal masses of helium and oxygen gases are given equal quantities of heat. There will be a greater rise in the temperature of helium as compared to that of oxygen.
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15. In order to hit a target, a man should point his rifle in the same direction as the target.
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Chemistry
16. All amino acids form zwitter ions at all pH values and they have nearly same isoelectric points.
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17. The acid strength of alcohols decreases in the order
R— R | C | R —OH > R R CHOH > R—CH2OH —T/F
18. Benzaldehyde is condensed with aniline in presence of anhydrous zinc chloride, to give a Schiffs base.
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19. Benzaldehydeontreatmentwithconcentratedsolution of NaOH undergoes a disproportionation reaction.
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20. The specific optical rotation of freshly prepared solu- tion of glucose decreases slowly and finally becomes constant.
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21. At lowerconcentration of electrolytes, the aggregation of sol particles is known as flocculation which can be reversed on shaking.
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22. The maximum number of electrons which can be placed in an orbital with angular quantum number, 2 will be ten.
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23. For the equilibriumH2O(l) H2O(g) at 1 atm pres- sure and 25°C, the standard free energy change is equal to zero.
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24. Aniline on direct nitration with a mixture of concen- trated HNO3 andconcentratedH2SO4 gives ortho and para nitroaniline.
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25. Chlorobenzene of reacting with KCN easily give aromatic nitrile.
26. The normal density of a gas is equal to the product of vapour density ofgasand normaldensityof hydrogen.
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27. Element A combine with B to give AB and with C to give A2C, the formula of the compound formed by B and C will be B2C.
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28. Carbon monoxide(CO) is a neutral oxide and hence it can be easily dried over concentrated sulphuric acid.
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29. ThepairofoxidesofcopperhavingformulaeCuO and Cu2O illustrates the law of multiple proportions.
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30. When excess ethyl alcohol is heated with concen- trated sulphuric acid one mole of water is eliminated per mole of alcohol.
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Zoology
31. Parts of nervous system that regulates digestion is peripheral nervous system.
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32. Analogous organs explain ‘Divergent evolution’.
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33. Theridges and lines of finger tips forming finger prints are produced by epidermis.
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34. Descent with modification is the central theme of evolution.
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35. Lymphatic capillaries remove excess fluids from tissues.
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36. Duct of Botallo is vascular connection between aortic arch IV and aortic arch VI.
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37. Exocytosis transport materials out of cells.
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38. Skull of humans is monocondylic.
—T/F
39. Eccrine glands secrete sweat and apocrine glands secrete oils.
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40. Haversian system or osteon are anatomical unit of compact bone.
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41. Mucous cells of small intestine release enzymes disaccharidase and peptidase.
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42. Part of nervous system that regulates digestion is peripheral nervous system.
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43. Protein catabolism breaks down cellular protein mole- cules into their individual amino acids which can be used as a source of energy during dieting or starva- tion.
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44. Pulse rate is equivalent to heart rate.
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45. The haemoglobin of the foetus has a greater affinity for O2 than does adult haemoglobin.
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Botany
46. The corn is really a solid very much condensed vertical rootstock with a large apical bud.
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47. Sub-metacentric chromosome has unequal arms and assume L or J-shaped.
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48. Agranalchloroplastbears bundle sheath in sugarcane leaves.
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49. Fruitfly having four pairs of chromosomes will have four linkage groups.
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50. Leaves must synthesize amino acids before they can make any proteins.
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51. Rhizophora is a viviparous mangrove plant.
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52. In leaves, branched and non-articulated laticifers are not found.
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53. Biological oxygen demand is the amount of oxygen required for biological oxidation by microbes in any unit volume of water.
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54. In Allium, the megaspore mother cell divides only
once giving rise to two haploid cells one of which develops a bisporic embryo sac.
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55. Materials of biological origin that are applied com- monly to maintain and improve soil fertility are known as biofertilizers.
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56. Xylem transport usually organic nutrients from the leaves to the roots.
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57. Nucleoli are chiefly formed by chromatin.
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58. The trace element which causes the ‘black necrosis’ of stem due to the deficiency of boron.
—T/F
59. The causal organism of ‘black rust of wheat’ is
Puccinia graminis, a fungus.
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60. Actual amounts of trace elements range from as little as 2-3 parts in 100 million parts upto 10–100 parts in 100 million.
Physics
Q. What is the unit cell of a