Topic wise MCQ test for MH-CET and NEET
6. Plant water relation
1. The water potential of pure
water is
(a) less than
zero
(b) more than
zero but less than one
(c) more than
one
(d) zero.
Answer:- (d) zero.
2. Which of the following
facilitates opening of stomatal aperture?
(a) Decrease in turgidity of guard cells
(b) Radial orientation of cellulose microfibrils in the cell wall
of guard cells
(c) Longitudinal orientation of cellulose microfibrils in the cell
wall of guard cells
(d) Contraction of outer wall of guard cells
Answer:- (b) Radial orientation of
cellulose microfibrils in the cell wall of guard cells
3. A few drops of sap were
collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates
that it is phloem sap?
(a) Acidic
(b) Alkaline
(c) Low
refractive index
(d) Absence
of sugar
Answer:- (b) Alkaline
4. Root pressure develops due
to
(a) passive
absorption
(b) active
absorption
(c) increase
in transpiration
(d) low
osmotic potential in soil.
Answer:- (b) active
absorption
5. A column of water within
xylem vessels of tall trees does not break under its weight because of
(a) lignification of xylem vessels
(b) positive root pressure
(c) dissolved sugars in water
(d) tensile strength of water.
Answer:- (d) tensile
strength of water.
6. In a ring girdled plant
(a) the shoot and root die together
(b) neither root nor shoot will die
(c) the shoot dies first
(d) the root dies first.
Answer:- (d) the root
dies first.
7. Transpiration and root
pressure cause water to rise in plants by
(a) pushing it upward
(b) pushing and pulling it, respectively
(c) pulling it upward
(d) pulling and pushing it, respectively.
Answer:- (d) pulling and pushing
it, respectively.
8. Which one gives the most
valid and recent explanation for stomatal movement?
(a) Starch hydrolysis
(b) Guard cell photosynthesis
(c) Transpiration
(d) Potassium influx and efflux
Answer:- (d) Potassium influx and efflux
9. Which of the following criteria
does not pertain to facilitated transport?
(a) Transport saturation
(b) Uphill transport
(c) Requirement of special membrane proteins
(d) High selectivity
Answer:- (b)
Uphill transport
10. In land plants, the guard
cells differ from other epidermal cells in having
(a) cytoskeleton
(b)
mitochondria
(c)
endoplasmic reticulum
(d)
chloroplasts
Answer:- (d)
chloroplasts
11. Guttation is the result of
(a) diffusion
(b) transpiration
(c) osmosis
(d) root pressure.
Answer:- (d) root pressure.
12. With an increase in the
turgidity of a cell, the wall pressure will be
(a) fluctuate
(b) remain
unchanged
(c) increase
(d) decrease.
Answer:- (c)
increase
13. Guard cells help in
(a)
transpiration
(b) guttation
(c) fighting
against infection
(d)
protection against grazing.
Answer:- (a)
transpiration
14. The rupture and
fractionation do not usually occur in the water column in vessel / tracheids during
the ascent of sap because of
(a) weak gravitational pull
(b) transpiration pull
(c) lignified thick walls
(d) cohesion and adhesion.
Answer:- (d) cohesion and adhesion
15. When a cell is fully
turgid, which of the following will be zero?
(a) Turgor
pressure
(b) Water
potential
(c) Wall
pressure
(d) Osmotic
pressure
Answer:- (b) Water potential
16. The translocation of
organic solutes in sieve tube members is supported by
(a)
cytoplasmic streaming
(b) root
pressure and transpiration pull
(c) P- proteins
(d) mass flow involving a carrier and ATP.
Answer:- (c)
P- proteins
17. Potometer works on the
principle of
(a) osmotic pressure
(b) amount of water absorbed equals the amount transpired
(c) root pressure
(d) potential difference between the tip of the tube and that of
the plant.
Answer:- (b) amount of water
absorbed equals the amount transpired
18. Stomata of a plant open
due to
(a) influx of
potassium ions
(b) efflux of
potassium ions
(c) influx of
hydrogen ions
(d) influx of
calcium ions.
Answer:- (a) influx of
potassium ions
19. Main function of lenticel
is
(a) transpiration
(b) guttation
(c) gaseous exchange
(d) bleeding.
Answer:- (c) gaseous
exchange
20. Opening and closing of
stomata is due to the
(a) hormonal change in guard cells
(b) change in turgor pressure of guard cells
(c) gaseous exchange
(d) respiration.
Answer:- (b)
change in turgor pressure of guard cells
21. Passive absorption of
minerals depends on
(a)
temperature
(b)
temperature and metabolic inhibitor
(c) metabolic
inhibitor
(d) humidity.
Answer:- (a) temperature
22. Glycolate induces opening
of stomata in
(a) presence
of oxygen
(b) low CO2
concentration
(c) high CO
2
(d) CO 2
absent.
Answer:- (b) low CO2 concentration
23. Loading of phloem is
related to
(a) increase
of sugar in phloem
(b)
elongation of phloem cell
(c)
separation of phloem parenchyma
(d)
strengthening of phloem fiber.
Answer:- (a)
increase of sugar in phloem
24. The movement of ions
against the concentration gradient will be
(a) active
transport
(b) osmosis
(c) diffusion
(d) all of
the above.
Answer:- (a)
active transport
25. In soil, water available
for plants is
(a)
gravitational water
(b)
chemically bound water
(c) capillary
water
(d)
hygroscopic water
Answer:- (c)
capillary water
26. The water potential and osmotic potential of pure
water are
(a)
100 and 200
(b)
zero and 100
(c) 100 and zero
(d)
zero and zero
Answer:- d) zero and zero
27.
Bidirectional translocation of solutes takes place
in
(a)
parenchyma
(b) cambium
(c) xylem
(d) phloem.
Answer:- (d) phloem.
28.
When water enters in roots due to diffusion, is
termed as
(a) osmosis
(b)
passive absorption
(c)
endocytosis
(d) active absorption.
Answer:- (b) passive absorption
29.
Translocation of carbohydrate nutrients usually
occurs in the form of
(a) glucose
(b) maltose
(c) starch
(d) sucrose.
Answer:- (d) sucrose.
30. In guard cells when
sugar is converted into
starch, the stomatal pore
(a) closes
completely
(b)
opens partially
(c) opens fully
(d)
remains unchanged.
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