EASY
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Carbohydrates are commonly found as starch in storage organs of plants. Which of the following five properties is performed by starch (1-5) in the storage process?

(1) Easily translocated
(2) Chemically non-reactive
(3) Easily digested by animals
(4) Osmotically is inactive
(5) Synthesized during photosynthesis

The useful properties are

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Important Questions on Plant Water Relation

EASY
A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicate that it is phloem sap?
EASY
What is the direction of movement of sugars in phloem?
MEDIUM
Choose the correct order of statements regarding the translocation of sucrose.
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.
MEDIUM
Arrange the given events that occur in phloem for removal of water from phloem to xylem:
I) Incoming sugars are actively transported out and removed as complex carbohydrates.
II) Increase of water potential.
III) Increase of hydrostatic pressure in sieve tubes.
IV) Transport of water into sieve tubes by osmosis.
MEDIUM
"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
HARD

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

The correct answer is

EASY

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__.

MEDIUM

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:

EASY
Which of the following statement is incorrect w.r.t. Munch theory?
EASY
Which of the following technique has been used by Mittler for collecting the phloem sap
MEDIUM

According to mass flow hypothesis of phloem transport

EASY
Which of the tissue is more important for translocation of sucrose
EASY
By cut in a ringing of tissues, what can be achieved
EASY
Translocation of food in plants was demonstrated by
EASY
Who has used two bulbs of semipermeable membrane to explain pressure flow theory?
EASY
Assertion : The movement of photosynthates is unidirectional.

Reason : Movement of photosynthates occurs with the water.
EASY
The translocation of organic solutes in sieve tube members is supported by:
EASY
Which ions are concerned with sugar transport?