Plant Physiology
Exam Duration: 45 Mins Total Questions : 30
During absorption of water by the roots, the water potential of cell sap is lower than that of
- (a)
pure water as well as soil solution
- (b)
neither pure water nor soil solution
- (c)
pure water but higher thsn soil solution
- (d)
soil water but higher than pure water
Phytochrome is found in
- (a)
algae
- (b)
fungi
- (c)
flowering plants
- (d)
all vascular plants
If the CO2 content of the atmosphere is as high as 300 parts per million
- (a)
the plants would not grow properly
- (b)
plants would grow for sometime and then die
- (c)
all plants would be killed
- (d)
all plants would thrive well
Number of ATP molecules produced by each NADPH is
- (a)
three
- (b)
two
- (c)
one
- (d)
five
Which one of the following is the terminal electron acceptor?
- (a)
Molecular CO2
- (b)
Molecular O2
- (c)
Molecular H2
- (d)
NADPH2
The site of EMP pathway of breakdown of glucose in a cell is
- (a)
nucleplasm
- (b)
mitochondria
- (c)
cytoplasm
- (d)
peroxisome
The basipetal and lateral transport of auxin is inhibited by
- (a)
gibberellins
- (b)
ethylene
- (c)
ABA
- (d)
zeatin
In many plants, the change over from vegetative reproduction phase takes place in response to
- (a)
the length of the day
- (b)
the severity of temperature
- (c)
mainly, the food material available in the soil
- (d)
the O2 present in the air
During senescence, there is sharp rise in the rate of
- (a)
protein synthesis
- (b)
transpiration
- (c)
respiration
- (d)
lipid synthesis
Cell elongation in internodal regions of the green plants takes place due to
- (a)
indole acetic acid
- (b)
cytokinin
- (c)
gibberellins
- (d)
ethylene
In photosynthesis, what occurs in PS-II ?
- (a)
It takes longer wavelength of light and e- from H2O
- (b)
It takes shorter wavelength of light and e- from H2O
- (c)
It takes longer wavelength of light and e- from NADP
- (d)
It takes shorter wavelength of light and e- from NADP
Which one of the following inhibits seed germination for a particular period?
- (a)
Light
- (b)
Water
- (c)
Carbon dioxide
- (d)
Dormancy
One hormone helps in ripening of fruits, while the other stimulates closure of stomata.These are respectively
- (a)
abscisic acid and auxin
- (b)
ethylene and abscisic acid
- (c)
abscisic acid and ethylene
- (d)
ethylene and gibberellic acid
- (e)
gibberellic acid and abscisic acid
In the photosynthesis process, PS-II absorbs energy at or just below
- (a)
780 nm
- (b)
880 nm
- (c)
860 nm
- (d)
680 nm
- (e)
700 nm
A cell when immersed in a solution, increases in volume; q the external solution is
- (a)
Hypertonic
- (b)
Isotonic
- (c)
Hypotonic
- (d)
Either hypertonic or hypotonic
Doors made up of wood, swell up in rainy season due to
- (a)
transpiration
- (b)
imbibition
- (c)
exosmosis
- (d)
guttation
The amino acids - cysteine and methionine contain
- (a)
Calcium
- (b)
Zinc
- (c)
Sulphur
- (d)
Molybdenum
The first stable product in C4 pathway is
- (a)
PGA
- (b)
OAA
- (c)
ATP
- (d)
NADPH2
The interrelationship between incident light and CO2 fixation rates is linear at
- (a)
High light intensity
- (b)
Moderate light intensity
- (c)
Low light intensity
- (d)
Very high light intensity
Glycolysis
- (a)
takes place in the mitochondria
- (b)
produces no ATP
- (c)
has no connection with electron transport chain
- (d)
reduces two molecules of NAD+ for every glucose molecule processed
Internode elongation in deep water rice plants is achieved with the help of
- (a)
auxin
- (b)
ethylene
- (c)
gibberellin
- (d)
ABA
Krebs' cycle is also called metabolic sink as it is a common pathway for
- (a)
carbohydrates, fats and proteins (amino acids)
- (b)
carbohydrates and fats only
- (c)
carbohydrates and organic acids only
- (d)
proteins and fats only
Refer to the given reaction. What does it depict?
- (a)
Oxidative amination
- (b)
Reductive amination
- (c)
Transamination
- (d)
Deamination
The 'Red - drop' phenomenon is due to the distribution of the photo chemical activity of
- (a)
PS-I
- (b)
PS-I & PS-II both
- (c)
PS-II
- (d)
Carotenoids
Induction of flowering in plants by low temperature treatment is called:
- (a)
Vernalization
- (b)
Photoperiodism
- (c)
Cryobiology
- (d)
Chilozology
Grana present in chloroplast refers to
- (a)
Stroma lamellae
- (b)
Stacks of quantasomes
- (c)
Stacks of thylakoids
- (d)
Double membranous envelope
First oxidative decarboxlation in aerobic respiration occurs during the conversion of
- (a)
Oxalosuccinic acid to iso citric acid
- (b)
Pyruvic acid to acetyl CoA
- (c)
\(\alpha\)-ketoglutaric acid to succinyl CoA
- (d)
Fumaric acid to malic acid
Specific property attributed to GA is
- (a)
Shortening of genetically tall plants
- (b)
Elongation of genetically dwarf plants
- (c)
Rooting of stem cuttings
- (d)
Promotion of leaf and fruit fall
Interconversion of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate is catalyzed by which enzyme?
- (a)
Phosphotriose isomerase
- (b)
Phosphohexose isomerase
- (c)
Phosphoglyceromutase
- (d)
Triose kinase
Which of the following prevent the fall of fruits?
- (a)
GA3
- (b)
NAA
- (c)
Ethylene
- (d)
Zeatin