Download 01. The guard cells are characterized by 1. Uniformly thick cell

CET MODEL QUESTION PAPER – 2011
PLANT WATER RELATIONS
01. The guard cells are characterized by
1. Uniformly thick cell wall
2. Thick concave and thin convex wall
3. Thick convex and thin concave wall
4. Uniformly thin cell wall
02. The abscissic acid stimulates the stomatal closure by
1. Influx of K+
2. Efflux of K+
3. Influx of malic acid
4. None of these
03. The spray of low viscosity waxes only on the dorsal surface of dicot leaves
causes
1. Decreased transpiration
2. Increased transpiration
3. No effect on transpiration
4. Chlorosis
04. A cell has osmotic potential of -8 bars and Solute potential 6 bars, then the
water potential of the cell is
1. 14 bars
2. -2 bars
3. +2 bars
4. -8 bars
05. Epithem tissue is characteristic of
1. Lenticels
2. Hydathode
3. Cork
4. Bark
06. The most important force which pulls the water up in the plant is
1. Cohesive force
2. Transpiration pull
3. Adhesive force
4. None of these
07. Enzyme that is responsible for conversion of starch into malic acid
1. PEP carboxylase
2. PEP kinase
3. Hexokinase
4. Both A and B
08. A cell decreases in size, when placed in the following solution
1. Hypotonic solution
2. Isotonic solution
3. Hypertonic solution
4. Weak solution
09. In a turgid cell the turgor pressure is equal and opposite to
1. Osmotic pressure
2. Solvent pressure
3. Solute pressure
4. Wall pressure
10. The storage of pickles dependent on the phenomenon of
1. Turgidity of cells
2. Plasmolysis
3. Antibiotic property
4. None of these
11. The water potential of a plant cell is equal to
1. ?Žm + ?Žs + ?Žp
2. ?ám + ?Ž
s
s - ?V
p
4. ?ám - ?V
s + ?V
p
3. ?ám - ?V
12. The imbibition is a physical process which requires the presence of
1. Semi permeable membrane
2. Hydrophilic substances
3. Hydrophobic substances
4. Permeable membrane
13. The available water for absorption by the plants is
1. Gravitational water
2. Capillary water
3. Hygroscopic water
4. Run away water
14. Which of the following organic substance have maximum imbiding
capacity?
1. Starch
2. Protein
3. Agar
4. Cellulose
15. A plasmolysed cell kept in water leads to
1. Deplasmolysis
2. Exosmosis
3. No osmosis
4. None of these
16. Name the amphistomatic leaf of the following
1. Grass
2. Lotus
3. Sunflower
4. Vinca
17. The stomatal frequency means
1. Total number of stomata in a leaf 2. Number of stomata per unit area
3. Total number of stomata in a plant 4. None of these
18. The vein loading occurs at
1. Root
2. Shoot tip
3. Leaf
4. Flower
19. The “transpiration is a necessary evil” the statement was given by
1. Curtis
2. Levitt
3. Munch
4. Steward
20. The following is also an important antitranspirant
1. Oxygen
2.Carbon di-oxide
3. Light
4. Nitrogen
21. One of the following act as source in plants during translocation of food as
per munch hypothesis.
1. Root
2. Leaf
3. Both A and B
4. None of these
22. The translocation of organic food substances in angiosperm plant is
1. Multidirectional
2. Bidirectional
3. Unidirectional
4. None of these
23. Most abundant sugar of phloem sap is
1. Sucrose
2. Raffinose
3. Stachyose
4. Glucose
24. The following statement is true with respect to hydathodes
1. They remain closed during day time
2. They remain closed during night time
3. Remain always open
4. None of these
25. The changes in the water content of the bulliform cells results in
1. Transpiration
2. In rolling of leaves
3. Guttation
4. Ascent of sap
26. External factors influencing the rate of transpiration are
1. Temperature, Light, available water, relative humidity.
2. Temperature, Chlorophyll, available water, relative humidity.
3. Temperature, Light, available water, oxygen concentration.
4. Temperature, Light, Chlorophyll, Carbon dioxide.
27. During simple potometer experiment the selected plant twig is cut under
water because
1. To prevent the entry of air into sieve tube
2. To prevent the entry of air into xylem vessels
3. To avoid the entry of dust particles
4. None of these
28. In the Cobalt chloride paper experiment, the change of colour due to
transpiration is
1. Pink to blue
2. Pink to red
3. Blue to red
4. Blue to pink
29. The potato tuber cells in the potato osmoscope expt. act as
1. Permeable membrane
2. Semi permeable membrane
3. Impermeable membrane
4. None of these
30. Active osmotic theory of water absorption was proposed by
1. Atkins and priestly
2. Thimann and Kramer
3. Dixon and jolley
4. None of these
31. The total amount of water present in the soil is called
1. Chesard
2. Echard
3. Holard
4. Symplast
32. Auxins are produced in the plant at
1. Root apex
2. Shoot apex
3. Fruits
4. Leaves
33. The plant hormone that exhibit autocatalytic nature
1. Auxins
2. Gibberellins
3. Ethylene
3. Aquaporins
34. Cytokinins are naturally present in the
1. Green vegetables
2. Fruits
3. Seeds
4. Liquid endosperm of coconut
35. The Shoot system shows phototropism due to
1. Unequal distribution of auxins
2. Equal distribution of auxins
3. Attraction of Sunlight
4. None of these
36. The Potassium permanganate solution delay ripening of fruits, because
1. It is effective growth promoter
2. It delays senescence
3. It is effective absorbent of ethylene 4. It destroy chlorophyll
37. Some plants require exposure to low temperature before flowering, this
phenomenon is called
1. Incubation
2. Senescence
3. Hibernation
4. Vernalisation
38. The following auxin is also used as weedicide
1. 2,4-Dichloro acetic acid
2. 2,4-Dichlorophenoxy acetic acid
3. 2,4-Diphenoxy acetic acid
4. 2,4-Trichloroacetic acid
39. The tissue and organ differentiation in response to light is known as
1. Photomorphogenesis
2. Phototropism
3. Photoperiod
4. Photolysis
40. Statement –
A: Cytokinins stimulate the opening of stomata as per proton transport
theory.
B: The transpiration through stem is called cauline transpiration
Choose the correct answer of the following.
1. Only A is correct
2. Only B is correct
3. Both are correct
4. Both are wrong
Key Answers
01-2
02-2
03-3
04-2
05-2
06-2
07-1
08-3
09-4
10-2
11-1
12-2
13-2
14-3
15-1
16-1
17-2
18-3
19-1
20-2
21-1
22-2
23-1
24-3
25-2
26-1
27-2
28-4
29-2
30-1
31-3
32-2
33-3
34-4
35-1
36-3
37-4
38-2
39-1
40-3