A plant species A has a diploid number of chromosomes as 12. Another plant species B has a diploid number of chromosomes has 16. The allopolyploid developed by hybridization of Aand B shall have a diploid chromosomes number as? (1) 14 (2) 28 (3) 40 (4) 56

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

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