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Question-1
In a plant organ, which is covered by periderm and in which the stomata are absent, some gaseous exchange still takes place through
(A)
Lenticels
(B)
Trichomes
(C)
Aerenchyma
(D)
Pneumatophores
Question-2
Stomata opens by the
(A)
Influx of Ca2+ ions
(B)
Influx of K+ ions
(C)
Outflux of K+ ions
(D)
Influx of Mg+ ions
Question-3
Lenticels and hydathodes are small pores with which of the following common attributes?
(A)
They are always remain closed
(B)
They allow exchange of gases
(C)
Their opening and closing is not regulated
(D)
They are found on the same organ of plants.
Question-4
The separation of components of a mixture based on their differential movement is called
(A)
Antolysis
(B)
Plasmolysis
(C)
Autoradiography
(D)
Chromatography
Question-5
The stomata, that remain open throughout the day and close at night, are found in
(A)
Barley
(B)
Alfalfa
(C)
Pumpkin
(D)
Cereals
Question-6
Which of the following elements are essential for the photolysis of water?
(A)
Ca and Cl
(B)
Mn and Cl
(C)
Zn and I
(D)
Cu and Fe
Question-7
For 'ascent of sap', the root pressure theory was proposed by
(A)
Bose
(B)
Molish
(C)
Priestly
(D)
Godlewski
Question-8
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
Question-9
Which of the following is not an exchange process?
(A)
Osmosis
(B)
Diffusion
(C)
Active transport
(D)
Surface tension
Question-10
The rate of transpiration increases by
(A)
High humidity
(B)
Wetness in soil
(C)
High temperature
(D)
Low wind velocity
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Plus 2 Biology Science
ICSE/ISC
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