Which of the following is the initiating step in photosynthesis ?
ATP formation
glucose formation
photolysis of water
activation of chlorophyll by sunlight
In a fully turgid plant cell, which of the following is zero ?
DPD
equal to wall pressure
equal to turgor pressure
none of these
The water potential is
equal in soil and atmosphere
non-existent at both the places
highest in soil and lowest in atmosphere
lowest in soil and highest in atmosphere
The rate of transpiration in plants is dependent upon
light
temperature
humidity & wind
all of these
A 0.1 M solution of a solute has a water potential of
0 bar
-2.3 bars
22.4 bars
+ 2.3 bars
Which of the following is not an exchange process?
osmosis
diffusion
active transport
surface tension
A widely accepted theory for the ascent of sap is
capillary theory
inbibition theory
negative tension theory
cohesion tension theory
Lenticels and hydathodes are small pores with which of the following common attributes ?
they are always remain closed
they allow exchange of gases
their opening and closing is not regulated
they are found on the same organ of plants
Chemiosmotic theory of ATP synthesis, in the chloroplast and mitochondria, is based on
proton gradient
membrane potential
accumulation of K ions
accumulation of Na ions
Water is transpired from the mesophyll cells of the leaf. They develop a lower water potential than the
root xylem sap
stem xylem sap
leaf xylem sap
stem phloem sap
