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Question-1
The 'active mechanism' for opening and closing of stomata conceives accumulation of which of the following ions?
(A)
Na+
(B)
K+
(C)
Ca2+
(D)
Mg2+
Question-2
Which of the following is used to measure the rate of transpiration?
(A)
Potometer
(B)
Porometer
(C)
Osmometer
(D)
Osmoscope
Question-3
A 0.1M solution of a solute has a water potential of
(A)
0 bar
(B)
-2.3 bars
(C)
22.4 bars
(D)
+2.3 bars
Question-4
Primitive types of stomata are found in
(A)
Apophysis of capsule
(B)
Leaves of moss plants
(C)
Axes of moss plants
(D)
Submerged hydrophytes
Question-5
The ability of the venus fly trap to trap the insects is due to
(A)
Specialized muscle like cells
(B)
Rapid turgor pressure changes
(C)
Chemical stimulation by the prey
(D)
A passive process requiring no special ability on the part of the plant
Question-6
The exchange of substances, between individual cells and their environment, takes place by
(A)
Osmosis
(B)
Diffusion
(C)
Active transport
(D)
All of these
Question-7
Cork cambium results in the formation of cork, which becomes impermeable to water due to the accumulation of
(A)
Resins
(B)
Suberin
(C)
Lignins
(D)
Tannis
Question-8
When the fluid outside a cell has a greater concentration of a given molecule than the fluid inside the cell, the external fluid is
(A)
Isotonic
(B)
Hypotonic
(C)
Hypertonic
(D)
Both 1 and 2
Question-9
A widely accepted theory for the ascent of sap is
(A)
Capillary theory
(B)
Inhibition theory
(C)
Negative tension theory
(D)
Cohesion tension theory
Question-10
Wilting occurs when
(A)
Relative humidity is high
(B)
Rate of transpiration is equal to the rate of absorption
(C)
Rate of transpiration is higher than that of the rate of absorption
(D)
Rate of absorption is higher than the rate of transpiration
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Plus 2 Biology Science
ICSE/ISC
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