51. Which of the following are also called as 'drought evaders' or 'drought escapers'?
52. Consider the following statements and choose the correct answer:
1. At low temperature, the viscosity of water increases
2. Low temperature retards the growth of the roots
3. At low temperature, viscosity of protoplasm and cell wall decreases
4. Low temperature increases the metabolic activities of the root cells
1. At low temperature, the viscosity of water increases
2. Low temperature retards the growth of the roots
3. At low temperature, viscosity of protoplasm and cell wall decreases
4. Low temperature increases the metabolic activities of the root cells
53. Haberlandt (1922) has given the "necrohormone" theory for the production of
54. The porphyrin head of chlorophyll is made up of porphyrin system in which four pyrole rings are linked together by
55. Process by which plant prepare their food is
56. Yellow spots on citrus leaves is due to the deficiency of
57. The commonest characters found in case of total phanerogamic parasite include
58. Which of the following forests are also called Selvas?
59. Ustilago tritici absorbs nutrition from the host cells by
60. The first hint that apical dominance might be because of auxin produced at the terminal bud and transported downward through the stem was given by
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