Transport in Plants: MCQs Test – 1 4


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Test Type: MCQs (Multiple Choice Questions), Total Questions 15, Test Name: Transport in Plants – Test 01

Transport in Plants: MCQs Test - 1

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Question 1
In a plant organ, which is covered by periderm and the stomata are absent, some gaseous exchange still takes place through
A
pneumatophores
B
trichomes
C
aerenchyma
D
lenticels
Question 2
The carbohydrates synthesized in the leaves are transported through sieve tubes most commonly in the form of
A
glucose
B
triose sugar
C
sucrose
D
soluble starch
Question 3
Phenylmercuric acetate
A
reduces transpiration rate
B
reduces photosynthesis
C
reduces respiration
D
kills the plant
Question 4
The amount of water held by the soil after drainage is known as
A
Mineral water
B
Soil water
C
Field capacity
D
Gravitational capacity
Question 5
In soil, water available for plants is
A
Capillary water
B
Hygroscopic water
C
Gravitational water
D
Chemically bound water
Question 6
Turgidity of the cells is maintained by
A
osmotic pressure
B
wall pressure
C
turgor pressure
D
diffusion pressure
Question 7
Wilting of a plant results from excessive  
A
respiration
B
photosynthesis
C
absorption
D
transpiration
Question 8
The phytohormone, which increases the concentration of potassium in guard cells is also responsible for the induction of
A
Cell division
B
Triple response growth
C
Apical dominance
D
Abscission
Question 9
Potometer works on the principle of
A
Osmotic pressure
B
Amount of water absorbed equals the amount transpired
C
Potential difference between the tip of the tube and that of the plant
D
Root pressure
Question 10
According to Steward’s starch hydrolysis theory, which one of the following is the principal reason for the opening of stomata during daytime?
A
Photosynthetic utilization of CO2 in guard cells.
B
Influx of K+ ions into guard cells under the influence of ABA hormone.
C
Conversion of sugar into starch in guard cells.
D
Efflux of K+ ions from guard cells under the influence of ABA hormone.
Question 11
The osmotic potential and pressure potential of three cells (A, B, C) located in different parts of an actively transpiring plant are given below:
Cell Osmotic Potential (MPa) Pressure Potential (MPa)
A – 0.87 0.44
B – 0.92 0.34
C – 0.68 0.27
Identify these three cells as root hair, root cortical and leaf mesophyll cells respectively. The correct answer is.
A
C, A, B
B
A, C, B
C
A, B, C
D
B, C, A
Question 12
A leaf peeling of Tradescantia is kept in a medium having 10% NaCl. After a few minutes if we observe the leaf peel under the microscope, we are likely to see
A
Entry of water into the cell
B
Exit of water from the cell
C
Diffusion of NaCl into the cell
D
The cells bursting out
Question 13
Study the following table showing the components of water potential in closely arranged mesophyll cells namely A, B and C.
Cell Osmotic Potential (MPa) Pressure Potential (MPa)
A – 0.21 0.05
B – 0.22 0.02
C – 0.23 0.05
Identify two of the following which show correct direction of water movement between two cells. I. A → B, II. B → C, III. C → A, IV. C → B The correct pair is
A
I, II
B
II, III
C
I, IV
D
II,IV
Question 14
Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be:
A
No movement of water
B
Movement of water from cell B to A
C
Movement of water from cell A to B
D
Equilibrium between the two
Question 15

Assertion:  When  dried  seeds  of  pea  are  placed  in  a  tin  and  water  added  up  to  their upper level and then a lid is put lightly over it. Within an hour, the lid will be blown off.

Reason: Due to rapid cell division in pea seeds.

A
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
B
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
C
Assertion is true, but Reason is false.
D
Both Assertion and Reason are false.
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