M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Botany
ENVIRONMENTAL PLANT PHYSIOLOGY
Time: 2½ Hours Max. Marks: 70
Instructions: Attempt totally five questions.
Q.1 is compulsory.
Figures to the right indicate full marks.
Attempt any two questions from Q.2 to Q.4.
Attempt any two questions from Q.5 to Q.7.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
Tissue water potential is measured in the units of
Amperes Volts
Calories Megapascals
Desert ephemerals are an example of type of plants.
Drought resistant Drought escape
Drought tolerant Drought sensitive
Photorespiration in C3plants gets when CO2 level is increased.
Increased Reduced
Maintained Balanced
Depletion of ozone increases the amount of radiations reaching the globe.
Visible UV
IR Gamma
Cell membranes of plants resistant to chilling injury contain fatty
acids in their lipid bilayer.
Saturated Long chain
Unsaturated Short chain
SOD catalyzes the reduction of into hydrogen peroxide.
Molecular oxygen Singlet oxygen
Ozone Superoxide
Acid rain is caused by higher concentrations of in the atmosphere.
NOx and SO2 NO2 and O3
SO2 and O3 CO2 and SO2
is a halophyte.
Suaeda Sugarbeet
Date palm Cotton
Accumulation of phytohormone occurs during waterlogging.
IAA Cytokinin
Ethylene ABA
10) In sodic soils a high concentration of is present.
Salt Sodium
Potassium Sand
Page 2 of 2
SLR-VD-109
11) Potassium ions play an important role in
Stomatal movements Protein synthesis
Cell signalling None of the above
12) Manganese toxicity in plants is identified by
Chlorosis
Necrosis
Brown sports surrounded by chlorotic zone
All the above
13) Disease occurs in the plants when the pathogen lacks
R genes avr genes
DIR1 genes None of these
14) are considered to be the indicators of heavy metal stress.
Compatible solutes Phytochelatins
LEA proteins HSPs
Q.2 What is a disease? Describe biochemical changes occurring in the host tissue
during fungal infection.
14
Q.3 Give an account of effect of salt stress on plant metabolism.
Write a note on mechanism of salt tolerance in higher plants.
07
07
Q.4 Describe in brief:-
Effects of water stress on plant metabolism.
Structural adaptation in xerophytes in response to water stress.
07
07
Q.5 Write on:
Effect of SO2 on plant metabolism. 07
Chilling injury 07
Q.6 Give an account
Reactive oxygen species in plants and their origin.
07
Antioxidants in plants and their role. 07
Q.7 Write short notes on any three:- 14
Proline accumulation in plants
Heat shock proteins
Effects of flood and tolerance mechanism in plants
Impact of elevated CO2 concentration on plants