
Carbohydrates are commonly found as starch in storage organs of plants. Which of the following five properties is performed by starch in the storage process?
Easily translocated
Chemically non-reactive
Easily digested by animals
Osmotically is inactive
Synthesized during photosynthesis
The useful properties are
Chemically non-reactive
Easily digested by animals
Osmotically is inactive
Synthesized during photosynthesis

Important Questions on Plant Water Relation



A) Loading of sugars into phloem setup a water potential gradient that facilitates mass movement in phloem.
B) Sucrose moves into companion cell and then to phloem sieve tube cell by active transport.
C) A hypertonic condition in phloem facilitating water from the xylem into phloem by osmosis.
D) All sink sugars are transported out of the phloem producing high water potential with returning of water to xylem.
E) With increase in hydrostatic pressure in phloem pressure flow begin and sap moves through phloem.

Incoming sugars are actively transported out and removed as complex carbohydrates.
Increase of water potential.
Increase of hydrostatic pressure in sieve tubes.
Transport of water into sieve tubes by osmosis.


Find correct statements from the following
Protein transporters are responsible for maximum rates of transport under saturated state
Translocation of substances in bulk flow requires hydrostatic pressure gradient
Root pressure plays the greatest contribution for upward movement of water in tall plants
Transport proteins of endodermal cells are control points for active transport of ions in two directions
The correct answer is

The combination of numbered terms that correctly completes all the following statements is
i. Transport through the phloem is __1__ while transport through the xylem is __2__.
ii. Loading of sugars into the phloem is __3__ at the source.
iii. Movement of water out of the phloem at the sink is __4__.

In "Pressure Flow" hypothesis, sugars are transported from 'source' to 'sink'. The initial steps which occur during this physiological process are shown here.
I. In leaves glucose is converted to sucrose.
II. Sucrose moves from sieve tube cells to companion cells by active transport.
III. Loading of sucrose produces a hypotonic condition in the phloem.
IV. Water in the adjacent xylem moves into phloem by osmosis.
Identify the above correct statements:




According to mass flow hypothesis of phloem transport





Reason : Movement of photosynthates occurs with the water.



