What is Mass Flow Hypothesis

What is Mass Flow Hypothesis


According to mass flow hypothesis, the sugars in solution can move freely through the sieve tubes from the leaves to all non-photosynthetic parts of the plants. This movement is because of the difference in the concentration gradient at the place of manufacture of sugar.


Objection of Hypothesis:


One objection against the mass flow hypothesis is that the phloem often transports substances in the opposite direction too i.e. dup the stem to provide nourishment and energy to the leaves and shoots for their growth and also to the developing seeds and fruits.


But this objection does not hold good if we recall the structures of the phloem tissue. The phloem tissue consists of many sieve tubes, not just one, and the fluids can move in opposite direction in two different but closely situated sieve tubes. Here too, the movement of fluids in opposite direction would also depend on opposing pressure gradients in the two sieve tubes.


Note: In general, correspondence education has its own “advantages”: combining work with study is especially successful, if the profile of education and the profession coincide; the student himself plans his study time; the cost of training is lower, and the quality of knowledge is the same as that of full-time students, because the material is read by the same professors and teachers; the student from the first course learns to independently find the missing information and to separate important knowledge from the secondary. The main thing in correspondence education is to conscientiously treat your education in order to get a decent diploma in your hands. But it is worth noting that there were some “minuses”. Whatever one may say, the part-time students avoid all the gay student life, which many graduates miss. However, if this is not important to everyone, then there are other more tangible nuances. For example, young men who study on the part-time form of training do not receive a respite from the army. And in general all benefits on the student card for part-time students do not apply.

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