A plasmolysed cell can be deplasmolysed by placing it in :
Pure water or hypotonic solution
Hypertonic solution
Isotonic solution
4, Saturated solution
If alcohol treated cell is kept in hypertonic solution it:
Bursts
Plasmolysed
Remains same
None
The loss of water through cuticle may reach upto :
5%
10%
20%
40%
Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock. Such a pressure is built up through the phenomenon of :
Imbibition
Buttress roots
Prop roots
Turgor pressure
The cohesive force existing between molecules of water is contributing to :
ascent of sap
translocation
plasmolysis
osmosis.
To initiate cell plasmolysis, the salt concentration must be :
isotonic
hypertonic
hypotonic
atonic
Ascent of sap is mainly attributed to :
cohesion force
imbibition
root pressure
capillarity
Solution concentration is higher in the external solution. The solution is
Isotonic
Hypotonic
Hypertonic
None of the above.
Which of the following statements are true/false?
a. the positive hydrostatic pressure is called turgor pressure.
b. wall pressure exerts to prevent the increase of protoplasm size.
c. diffusion is more rapid in liquids than in gases
d. diffusion of water through a semi-permeable membrane is called imbibition
e. osmosis is movement of substances which takes place along a diffusion gradient.
a and b are true & c, d and e are false
a and c are true & d, d and e are false
a and d are true & b, c and e are false
a and e are true & b, c and d are false
Path of water movement from soil to xylem is :
soil→ root hair→ cortex →pericycle →endodermis →metaxylem →protoxylem
soil →root hair→ cortex→ endodermis→ pericycle →protoxylem→ metaxylem
soil →root hair →epidermis→ endodermis→ phloem→ xylem
soil →root hair→ epidodermis→cortex→ phloem→ xylem
Turgor pressure is also referred to as
solute potential
water potential
pressure potential
osmotic potential
The process responsible for the movement of water from roots to all other parts of plants is
Evaporation of Water from leaves
Capillary action
Active transport
Both 1 and 2
The combination of pressure potential and solute potential is
Osmotic pressure
Both b and c
Scientists take advantage of _______________ in studying translocation by phloem.
ants
aphids
bees
Mosquitoes
What may be regarded as a valid difference between active and passive absorption of water?
Passive absorption is affected by the presence of metabolic inhibitors
active absorption is accelerated by the presence of auxins
Passive absorption is dependent on development of root pressure
Active absorption is dependent on aerial parts of plants for the development of a pull force.
What is never zero in a cell-
Solute potential
Water potential
DPD
Diffusion pressure
The amount of pressure needed to stop fluid from moving by osmosis into a solution is referred to as the
In the absence of transpiration water moves up xylem because of
turgor pressure
evaporation
high soil mineral concentration
High root pressure can cause water to be lost by leaves through the process of
respiration
regurgitation
transpiration
guttation
Ringing experiments prove all but
Food is translocated through phoem
Water is translocated through xylem
Leaves are the sinks of phloem transport
The phloem tissue can be regenerated if the cambium is intact.
Loss of solutes from a cell leads to
Increase in water potential
Decrease in solute potential
Increase in pressure potential
All of the above
Apparently _______________ is the source of energy for keeping stomata open.
photosynthesis
ion transfer
sodium pump
Maintaining turgor pressure in guard cells requires an uptake of
K+
H+
ATP
CO2
About _______________ % of the water taken in by roots is lost by transpiration.
100
98
90
60
Essential ions except _______________ areremoved from the roots and relocated through the xylem.
phosphorus
potassium
nitrogen
calcium
Guttation is:
movement of soluble organic materials through plants.
movement of water through the apoplast.
evidence of root pressure.
negative pressure created by transpiration.
Stomata close when the guard cells:
lose water.
photosynthesis begins and the internal CO2 concentration decreases.
gain chloride ions.
become turgid.
The pathway of water from the soil through the plant to the atmosphere is best represented by which of the following sequences?
endodermis- cortex - epidermis - vessel elements - intercellular spaces in mesophyll - stomata.
epidermis - cortex - Casparian strip - endodermis - sieve cells - intercellular spaces in the mesophyll - stomata.
Casparian strip - root hairs - epidermis - cortex - xylem - endodermis - intercellular spaces in mesophyll - stomata.
root hairs - cortex - endodermis - vessel elements - intercellular spaces in mesophyll - stomata.
Which is an incorrect statement.
Translocation of minerals up the xylem is an active process
The target cells unload the minerals by an active process
The absorption of minerals by plants is mostly an active process
Minerals usually flow up the vessels along with the transpiration stream.
Which of the following terms would be used to explain how trees can lift water to heights of ten stories or more?
adhesion and cohesion
tensile strength
all of the above
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