In land plants, the guard cells differ from other epidermal cells in having
Mitochondria
Endoplasmic reticulum
Chloroplasts
Cytoskeleton
Related Questions
Ascent of sap in tall trees is helped by?
Cohesion of water
Adhesion of water with walls of xylem
Transpiration pull
All of these
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
Attraction of water molecules to polar surfaces is known as
Cohension
Capillarity
Surface tension
Adhesion
Cohesion force, a feature of cohesion theory is also called
Tensile strength
Adhesion force
Capillary action
Surface tension
The sugarcane plant has
Dumb bell-shaped guard cells
Pentamerous flowers
Reticulate venation
Capsular fruits
How much of absorbed water is lost during transpiration in a plant?
0.99
98-99%
0.999
90-95%
Stomata open and close due to
Turgor pressure change
Hormonal change
Temperature change
All of these
The cohesion-tension theory explains the ascent of sap in plants. The 'cohesion' part of this theory refers to:
The attraction between water molecules and xylem walls
The attraction between water molecules
The evaporation of water from the leaf surface
The active transport of water into the xylem
Which of the following is a benefit of transpiration to plants?
Preventing wilting
Cooling of the plant
Increasing salt concentration in leaves
Reducing water absorption
Through which process, starch of the guard cell is converted into PEP ions?
Dephosphorylation
Decarboxylation
Hydrolysis
Oxidation
