Read the following statement carefully and choose the right answer from the codes given below
I. PMA and silicon oil of low viscosity are considered as antitranspirant
II. BAP, NAA and cobalt chloride is also used as antitranspirant
III. Abscisic acid affects the mechanism of opening and closing of stomata
IV. Starch of guard cells is converted into PEP ions by the process of hydrolysis
V. Potometer works on the principle of potential difference between the tip of the tube and that of plant
VI. Transpiration rate is directly proportional to the relative humidity
I and III
II and IV
I, III and V
II, IV and VI
Related Questions
How much of absorbed water is lost during transpiration in a plant?
0.99
98-99%
0.999
90-95%
The transport of ions up the stem to all parts is through
Transpiration stream
Mass flow
Diffusion
None of these
The shape of guard cells in stomata in sugarcane plant is
Dumb bell-shaped
Bean shaped
Horse shoe shaped
Irregular shaped
Stomata which can open at night, are present in
Xerophytes
Gametophytes
Hydrophytes
None of these
Stoma opens, when
Guard cells swell due to an increase in their water potential
Guard cells swell by endosmosis due to influx of hydrogen ions (protons)
Guard cells swell by endosmosis due to efflux of potassium ions
Guard cells swell due to a decrease in their water potential
The force responsible for the water movement against gravity even up to a 130 m of tall free comes from
Root pressure
Transpiration pull
Diffusion pressure
Pulsation
The rate of transpiration will be very less in a situation where
Ground water is sufficiently available
Wind is blowing with a very high velocity
Environment is very hot and dry
Relative humidity is very high
Which one of the following is not an antitranspirant?
PMA
BAP
Silicon oil
Low viscosity
Ascent of sap in herbs is due to?
Root pressure
Transpiration pull
Cohesion of
Adhesion of
Guard cells control
Intensity of light entering
Photosynthesis
Closing and opening of stomata
Change in green color
