(A) Boron $(B)$ is an essential micronutrient for plants. It plays a critical role in pollen germination,pollen tube growth,and fruit setting. It is a

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(A) Boron $(B)$ is an essential micronutrient for plants. It plays a critical role in pollen germination,pollen tube growth,and fruit setting. It is also involved in the translocation of carbohydrates and is essential for cell division and cell elongation. Therefore,it is directly associated with flowering and fruit development.