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Notes on Munch's mass flow hypothesis - …

Munch’s mass flow hypothesis

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THE MASS FLOW HYPOTHESIS OF TRANSPORT IN PHLOEM

The cross walls present in between the sieve tubes offer a considerable resistance and thus prevent a rapid mass flow of food materials with in the phloem tissue.

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Therefore, it seems to take into consideration the
importance of phloem being a living tissue.
(4) For CAPE purposes we will consider the mass (pressure) flow hypothesis as a physical explanation.

Munch mass flow hypothesis by Aurelia Pugh - issuu

describe munch's mass flow hypothesis? | Yahoo Answers

I am writing to clarify a few areas.
(1) The mass flow hypothesis as we discussed in class is a purely physical explanation of translocation in the phloem.
(2) Because the mass flow hypothesis involves pressure being created to move the organic solutes from source to sink,
Munch revised his mass flow, to the pressure flow hypothesis.
Therefore it is called mass (pressure) flow hypothesis.
(3) In science articles the pressure flow hypothesis is usually discussed using active transport as an explanation for the high
hydrostatic pressure created to move sucrose in the sieve tubes.

Over the course of their evolutionary history, many organisms have lost genes, but sometimes the function of the discarded gene can be regained by repurposing genetic material the species has left. Many vertebrate species possess three genes related to taste, named T1R1, T2R2 and T3R3. Among this trio, T2R2 gives humans and other animals the ability to taste sweet foods. Genetic studies indicate that birds have lost the gene that would enable them to appreciate a candy store. But nectar-sipping hummingbirds show a clear preference for a sugary diet. A study led by Maude Baldwin in 2014 concluded that hummingbirds had repurposed T1R1 and T3R3, which pair up to sense umami (savory) flavors, to sense sweet ones as well. Baldwin postulated that hummingbird ancestors might have been introduced to a sweet diet by hanging out near flowers to catch insects. If so, it would bolster Darwin's claim that taste "must be acquired by certain foods being habitual — [and] hence become hereditary," though Baldwin cautioned that more evidence, such as early hummingbird fossils, was needed to flesh out her hypothesis.

Ernst Munch • Mass flow is a physical ..

The Munch’s hypothesis or mass flow or pressure flow hypothesis is proposed by E

Munch’s Mass Flow or Pressure Flow Hypothesis:

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