Mass Flow Hypothesis

Q.

At maturity, which of the following is non-nucleated?

1. Sieve cell

2. Palisade cell

3. Companion cell

4. Cortical cell

Q.

If cell A with DPD 5 atm is surrounded by many cells with DPD 4 atm then

1. the net movement of water will be from cell A to the surrounding cells

2. net movement of water will be from the : surrounding cells to cell A

3. water movement will depend on other unknown factors.

4. water will not move at all

Q.

Sieve tubes are characterized by

1. absence of septa

2. perforated oblique septa

3. perforated longitudinal walls

4. simple oblique septa

Q. Which of the following statement substantiates the mass flow hypothesis?
I. Sugar is translocated from sink to source.
II. Glucose is converted to sucrose at the sink.
III. Osmosis enables the movement of sucrose into the sieve tubes, which generates a hypertonic condition in phloem.

1. I and II
2. Only I
3. Only III
4. I, II and II