Entrance Preparation Biology Questions

31. Most suitable theory for ascent of sap is :
(a) transpiration pull and cohesion theory of Dixon and Jolly
(b) pulsation theory of J. C. Bose
(c) relay pump theory of Godleweski
(d) none of the above
32. Active absorption of water creates
(a) positive pressure in the xylem sap of shoot
(b) negaive pressure in the xylem sap of root
(c) positive pressure in the xylem sap of root
(d) negative pressure in the xylem sap of shoot
33. The pressure created in the tracheary elements of the root and which pushes water or sap upwards into the shoot system is known as :
(a) osmotic pressure (b) root pressure
(c) wall pressure (d) turgor pressure
34. The active absorption of Water does not required a direct supply of energy is known as
(a) non osmotic active absorption (b) osmotic active absorption (c) passive water absorption (d) imbibition
35. Metabolic energy is required and roots play a positive role in :
(a) passive mineral absorption (b) active absorption
(c) passive water absorption (d) none of these
36. Cohesion-transpiration pull theory operates only in :
(a) conditions restricting transpiration
(b) passive water absorption
(c) conditions favouring transpiration
(d) active water absorption
37. The plant tissue specialized for vertical transport belongs to :
(a) phloem and cortex (b) medulla and cortex
(c) xylem and phloem (d) xylem and epidermis
38. The oxidation of one NADH2 yields :
(a) 3 ATP (b) 38 ATP (c) 1ATP (d) 2 ATP
39. A molecule of sedoheptulose has carbon atoms numbering :
(a) 6 (b) 7 (c) 3 (d) 4

40. Emerson effect is associated with
(a) photosynthesis (b) transpiration
(c) respiration (d) salt absorption
41. NADP is converted to NADPH2 by ..... cycle
(a) PS I (b) PS II
(c) dark respiration (d) non cyclic
42. (102 acceptor in C3 plants is
(a) PEP (b) RuBP (c) RUP (d) PAG
43. Magnesium is the major constituent of : (a) nitrogenase enzyme (b) myoglobin (c) chlorophyll (d) ferridoxin
44. One of the plant which has been provided urea but is deficient of Mg will exhibit :
(a) curling of leaves (b) sudden leaf-fall
(c) yellowing of leaves (d) necrosis of shoot tips
45. Which one of the following is a micronutrient ?
(a) Ca (b) Mg (c) N (d) Mn
46. Nickel is an essential part of which of the followings enzymes ?
(a) (I cease (b) Nitrogenase
(c) Nitrate reductase (d) PEP carboxylase
47. The symbiotic association of fungi and algae is called :
(a) I ichen (b) mycrrohiza.
(c) myxomycetes (d) mycoplasma