Most of the movement in roots through apoplast is due to
Cortical cells are loosely packed and hence no resistance to water movement
Endodermal cells are loosely packed and hence no resistance to water movement
Pericycle cells are loosely packed and hence no resistance to water movement
Medullary cells are loosely packed and hence no resistance to water movement
Casparian strip makes
Endodermis impervious
Inner layer of cortex impervious
Outer layer pervious
More than one option is correct
The movement of water through apoplast stops at the level of ……..And crosses membrane to undergo symplast till xylem cells
Endodermis of root
Starch sheath
Inner layer of cortex
All of these
The path of water in xylem vessels and tracheids is
Symplast
Apoplast
Both A and B
Depends on gradient
Pinus has an/a…….. association with mycorrhizae and their …….. without the presence of mycorrhizae.
Obligate, seeds cannot germinate
Facultative, fruits cannot disperse
Obligate, roots can not spread down the soil
Facultative, leaves cannot perform photosynthesis.
Root pressure
Negative pressure
Pushing pressure
Tries to cope up with water requirement of well heighted plants
Effects are observed at day time and evening time
Water loss in liquid phase from the tip of the grass blades and leaves of herbaceous parts is called
Evaporation
Transpiration
Guttation
Solarization
If a cell A with DPD, 4 bars is connected to cells B, C, D whose OP and TP are respectively 4 and and 4, 10 and 5 and 7 and 3 bar, the flow of water will be:
C to A, B and D
A and D to B and C
A to B, C and D
B to A, C and D
Plant cells submerges in distilled water will become:
Turgid
Flaccid
Plasmolysed
Impermeable.
Osmosis is defined as the process in which :
Water diffuses from low solute concentration to high solute concentration
Solutes diffuse from lower concentration to higher concentration
Active transport of ions take place
Passive transport of ions take place.
Following are some statements which ones are not incorrect?a. Root pressure only provide a modest push in the overall process of water transportb. Root Pressure obviously does not play a major role in water movement up tall treesc. The greatest contribution of root pressure may be to re-establish the continuous chains of water molecules in the xylem which often break under the enormous tensions created by transpirationd. Most of the plants meet their need by transpiratory pulle. The exudate of guttation has pure water only
Which of the following is an expected rate of upward flow in plants due to transpiratory pull?
Up to 15 metres per hour
Up to 15 meters per minute
Up to 150 metres per hour
Up to 200 metres per hour
Which of the following is a model for Transpiration?
Cohesion-AdhesionTranspiration Pull Model
Cohesion Tension Transpiration Pull Model
Tension Transpiration Pull Model
Transpiration can be studied by
Cobalt chloride paper test
Chromium chloride paper test
Leaf enclosed in polybag
Both A and C
The immediate cause of opening and closing of stomata is a change in the
Turgidity of subsidiary cells
Flexibility of aperture
Change in the turgidity of guard cells
The inner wall of guard cell is not
Thin
Elastic
Towards the pore or stomatal aperture
The opening of stoma is also…….due to the orientation of the microfibril in the …….
of guard cells.
Supported, cytoplasm
Supported, cell wall
Affected, cell membrane
Affected, cytoplasm
Microfibril of Guard cells of stoma are not
Made up of Cellulose
Oriented radially
Makes it more easy for stoma to open
Found in cytoplasm
When stomata is open
Outer wall of guard cell is crescent shaped
Outer wall is bulged out while inner wall is crescent shaped
Outer wall is crescent shaped while inner wall is flat
Outer wall is flat while inner wall is crescent shaped
When guard cells lose turgor due to…….the elastic …….regain its shape and guard cells become…..
Water stress, outer wall and Turgid
Toxic, Inner wall and Flaccid
Toxic, Outer wall and Turgid
Water stress, Inner wall and Flaccid
Transpiration is affected by external factors
Find the wrong one.
Temperature, Light
Humidity
Wind Speed
Canopy structure
Transpiration is affected by internal factors
Find the wrong one
Number of stomata
Water status of plant
Per cent of open stomata
Wind speed
Number and distribution of stomata, Per cent of open stomata, water status of the plant, Canopy Structure, Temperature, light, Humidity, wind speed
How many factors are externally and internally affecting transpiration?
5,3
4,4
3,5
2,6
Transpiration driven ascent of xylem depends on which of the following properties of water?
Cohesion
Adhesion
Surface tension
Cohesion, adhesion and surface tension of water provides it
High tensile strength
High capillarity
High transpiration pull
Tensile strength is
Mutual attraction between water molecules
Attraction of water molecules to polar surfaces
More attraction in water molecules in liquid phase than in gaseous phase
An ability to resist a pulling force.
Cohesion is
Capillarity is not aided by
Tensile strength
Small diameters of the tracheary elements- the tracheids and vessels
The forces which are generated in xylem by transpiration pull can cause lifting of water up to
110 metres
13 metres
130 metres
19 metres
Evaporation from the leaf at first sets up a pressure gradient between the
Outside air and cytoplasm of cells of leaf
Outside air and air spaces of the leaf
Outside air and xylem cells of the leaf
Outside air and palisade cells of leaf
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