Plant Water Relations

Author:Embibe Experts
TS EAMCET
IMPORTANT

Important Questions on Plant Water Relations

EASY
IMPORTANT

Promycelium in Rhizopus develops from

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An example of physiological xerophyte is:

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The relationship among different types of soil water can be summed up by the following equation :

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The values osmotic potential (π) and pressure potential 'p' of cells A, B, C and D are given below :

Cell π ρ
Cell A -1.0 0.5
Cell B -0.6 0.3
Cell C -1.2 0.6
Cell D -0.8 0.4

Identify the correct sequence that shows the path of movement of water from among the following:

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IMPORTANT

A soil sample is found to have 25% of its volume occupied by the soil water. Of this, 10% is hygroscopic water and the remaining is capillary water. What is the field capacity of this soil?

MEDIUM
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Which one of the following denotes the water potential of the mesophyll cell in wilted condition?

MEDIUM
IMPORTANT

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. AB
II. BC
III. CA
IV. CB
The correct pair is

MEDIUM
IMPORTANT

Identify the fungus which produces chlamydospores from dikaryotic mycelium

MEDIUM
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Assign the following substances to the cell wall, flagella, 's' layer, and pili of bacteria in the correct sequence :
I. Glycoprotein
II. Fimbrillin
III. Teichoic acid
IV. Flagellin

The correct sequence is

HARD
IMPORTANT

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
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 

MEDIUM
IMPORTANT

Identify the plant in which the tangential walls of collocytes are excessively thickened but radial walls are thin.

EASY
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Which of the following statements related to plant structure are true?
(I) The cotyledons of Mourir have trichosclereids
(II) Young sieve elements possess cytoplasm without nucleus
(III) Cells of pericycle in dicot root are capable of dedifferentiation
(IV) Cork lacks stomata but yet performs gaseous exchange

HARD
IMPORTANT

If there are 135 hydrogen bonds between two strands of a fragment of DNA double helix which contains 23 guanine nitrogen bases, what is its total length?

EASY
IMPORTANT

Study the following table and identify the correct sequence of cells which shows the path of water movement between them :

Cell Osmotic Potential (MPa) Pressure Potential (MPa)
A -0.95 0.40
B -0.75 0.40
C -0.85 0.25
D -0.65 0.25

MEDIUM
IMPORTANT

Study the following table showing in components of water potential of three mesophyll cells - A, B and C:

Cell Osmotic potential Pressure potential
A -0.6 0.2
B -0.5 0.3
C -0.9 0.4

If the above cells are in direct contact with each other, then the water moves at the lowest rate between :

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IMPORTANT

Identify the correct pair of statements from the following
(I) Movement of cytoplasm around vacuoles in clockwise and anticlockwise manner occurs
(II) Heteropycnosis refers to the property of differential stainability of chromatin
(III) Dissolution of synaptonemal complex occurs in diplotene of meiosis-I
(IV) Either clockwise or anticlockwise movement of cytoplasm around the vacuole occurs in Rhoea discolor.

MEDIUM
IMPORTANT

Identify the correct pair of characters with reference to Pteris
(I) Neck canal cell is uninucleated
(II) Stem grows vertically in the soil
(III) Apogamously produced sporophytes are haploids
(IV) Open dichotomous venation in leaflets

The correct answer is

MEDIUM
IMPORTANT

Study the following table showing the components of water potential of four cells of a actively transpiring plant:

Cell Solute potential (MPa) Pressure potential (MPa)
A -0.68 0.42
B -0.75 0.36
C -0.83 0.47
D -0.57 0.29

Identify the four cells as root hair, cortical cell, endodermal cell (lacking casparian strips) and pericycle cell respectively in the young root (assuming symplastic water flow through them).