Saturday, March 17, 2012

PLANTS WATER RELATIONS ASSIGNMENT

1 Diffusion is the phenomenon shown by
I. Solids
II. Liquids
III. Gases





Ans:All
2 This is an example for diffusion




Ans:Uptake of CO2 during photosynthesis
3 Match the following with respect to Bryophyta
List – I  List – II

A) Hydroids I) Capsule
B) Protonema II) Rhizoids
C) Spore production III) Cauloid
D) Zooidogamy IV) Young gametophyte
  V) 





Ans:A - III, B - IV, C - I, D - V
4 [A]: Proteins show more imbibition than cellulose
[R]: Protins are soluble in water but not cellulose





Ans:A is true but R is false
5 Imbibition of water is shown by




Ans:Hydrophilic colloids
6 Identify the correct sequence of substances that show gradual increase in Imbibition




Ans:Cotton fibre; Paddy grains; Soybean seeds
7 Modified roots that absorb water by Imbibition are seen in




Ans:Bulbophyllum
8 In Potato osmoscope experiment, the structure of Potato that behaves as selectively permeable membrane is




Ans:Cell membranes of Storage parenchyma of Potato tuber
9 Choose the correct statements with respect to Thistle funnel experiment
I. There is gradual increase in hydrostatic pressure in the Thistle funnel
II. Water of the beaker continuously flows into the thistle funnel as there is no solute in the beaker and there is solute in the thistle funnel.
III. The Y of the solution present in the thistle funnel gradually increases.
IV. The Π of the thistle funnel gradually increases





Ans:I and III
10 A cell in evident plasmolysis state has the following condition




Ans:Y= Π
11 Morphologically similar cells A, B, C and D are kept respectively in solution P having 1% Sucrose solution, Q with 2% sucrose solution, R with 3% sucrose solution and S with 5% sucrose solution. Cell D has shown incipient plasmolysis and the other cells have not shown any signs of Plasmolysis. Choose the correct statements among the following.
I. Cell A is isotonic to solution P
II. Cell B is isotonic to solution Q
III. Cell C is isotonic to solution R
IV. Cell D is hypotonic to solution S





Ans:All except I and II
12 During the plasmolysis of a parenchyma cell there is decrease in the
I. Size of Plant cell
II. Size of protoplast
III. Amount of cytoplasm
IV. Vacuole





Ans:II and IV
13 Plasmolysis phenomenon helps the growing plant




Ans:in withstanding the water stress
14 During the process of Plasmolysis of Plant cell




Ans:The Y of outside solution and solution present between cell wall and Protoplast is same
15 [A]: In thistle funnel experiment, egg membrane behaves as selectively permeable membrane
[R]: Egg membrane allows the diffusion of both water and Sucrose





Ans:A is true but R is false
16 Choose the correct statement




Ans:Complete movement water from trichoblast to xylem of root can be symplastic
17 Water is mainly absorbed by plants by




Ans:Passive, osmotic mechanism
18 `[A]: Plants absorb water by Passive mechanism
[R]: Water of soil solution enters into root hair due to difference in water potential between soil and root hair





Ans:Both A and R are true but R is not the correct explanation of A
19 The components of symplast of plants are
I. Cell wall
II. Plasmodesmata
III. Intercellular spaces
IV. Protoplasts





Ans:II and IV
20 Choose the correct statement




Ans:Water path from endodermis to xylem of root is always symplastic
21 Water of soil enters into cell wall of root epidermal cell by




Ans:Imbibition
22 Arrange the following plants with gradual increase in their height
i) Pseudotsuga menziensii
ii) Eucalyptus amygdalina
iii) Sequoia sempervirence
iv) Eucalyptus regnans





Ans:iii, i, ii, iv
23 [A] : The main driving force for ascent of sap is transpiration.
[R] : Transpiration pull is greater than cohesive force of water.





Ans:A is true but R is false
24 In the experiment to demonstrate ascent of sap by cohesion and tension theory, the sponge can be compared with




Ans:Mesophyll
25 The theory proposed by Dixon explains the following function of plants




Ans:Movement of mineral water through xylem
26 The driving force for ascent of sap is




Ans:difference in Y between the mesophyll cells and xylem of leaf
27 The cohesive force of water is




Ans:30MPa
28 Match the following
Y value  regions
A) -30 I) Soil solution
B) -0.03 II) Root xylem
C) -3.0 III) Atmosphere
D) -0.3 IV) Leaf xylem





Ans:A - III, B - I, C - IV, D - II
29 [A]: Ringing experiments are carried out in Monocots
[R]: Monocots have atactostele in their stems





Ans:A is false but R is true
30 The tallest spermatophyte is




Ans:Eucalyptus regnans
31 During ascent of sap actually the tension is created in




Ans:Cell walls of mesophyll cells
32 The minimum water potential gradient required for ascent of sap in tallest plant of the plant kingdom is




Ans:13 bars
33 [A]: The Y of pure water is zero
[R]: The chemical potential of pure water is greater than the chemical potential of water present in a solution





Ans:Both A and R are true but R is not the correct explanation of A
34 Taylor coined the term




Ans:Water potential
35 If the turgor pressure of a cell increases, there is also increase in
I. Y
II. m
III. p
IV. p
V. T





Ans:I, II, III
36 A, B and C are the cells of a root. Cell A has the P of 3 MPa, Π of – 4.5 MPa and T of -0.5 MPa. Cell B has T as -0.75 MPa, Π of -4.5 Mpa and P of 2.75 MPa. Cell C has P as 6 MPa, T as -1.5 MPa and Π as – 5 MPa. If the movement of water is symplastic, Cells A, B and C are respectively




Ans:Cortical cell, Endodermal cell, Trichoblast
37 Matric potential is due to the presence of




Ans:Water insoluble hydrophilic substances
38 Wall pressure is due to the development of




Ans:Turgor pressure
39 In Potato osmoscope experiment, the structure that behaves as semipermeable membrane is




Ans:Cell membrane of storage parenchyma
40 In a turgid cell, the wall pressure and Turgor pressure are




Ans:Equal in opposite directions
41 Match the following
Plant cell  Y value

A) Trichoblast                     I)- 20 bars
B) Passage cell                   II)- 3 M p a
C) Root pericycle cell           III) -1 M p a
D) Mesophyll cell               IV) - 25 bars
          V) 0 bars





Ans:A - III, B - I, C - IV, D - II

No comments:

Asthra