A) phosphate nutrition
B) breaking of dormancy
C) decrease in diseases
D) retarding flowering
Correct Answer: A
Solution :
VAM is vesicular-arbuscular mycorrhiza, a symbiotic association of roots of most plants with fungi, usually of benefit to plant in providing phosphorus. VAM is a type of endomycorrhiza, in which fungal hyphae form two special organs called the vesicles and arbuscules cells of the roots. Arbuscules are branched haustorial fungal hyphae, which absorbs phosphorus and transport to vesicles, which stores the food. VAM functions only in mineral especially phosphate nutrition and has no role in breaking of dormancy, decrease in diseases and retardation of flowering. These physiological factors can be treated with chemicals and hormones.
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