Biology - Plant Physiology
Exam Duration: 45 Mins Total Questions : 30
The non-essential element present in several grasses, sedges, diatoms, etc is
- (a)
molybdenum
- (b)
cobalt
- (c)
zinc
- (d)
silicon
Minerals known to be required in large amounts for plant growth include
- (a)
phosphorus, potassium, sulphur, calcium
- (b)
calcium, magnesium, manganese, copper
- (c)
potassium, phosphorus, selenium, boron
- (d)
magnesium, sulphur, iron, zinc
Which of the following is synthesised during substrate phossphorylation?
- (a)
AMP
- (b)
ATP
- (c)
NADH
- (d)
FMN
Induction of cell division and delay in senescence is done by
- (a)
cytokinin
- (b)
kinetin
- (c)
gibberellin
- (d)
auxin
Osmotic potential of pure water is
- (a)
one
- (b)
zero
- (c)
less than zero
- (d)
between zero and one
In a fully turgid cell, the values of DPD, OP and TP will show the tendency
- (a)
DPD 10 atm ; OP 15 atm; TP 5 atm
- (b)
DPD 02 atm; OP 07 atm; TP 5 atm
- (c)
DPD 05 atm; OP 12 atm; TP 7 atm
- (d)
DPD 00 atm; OP 15 atm; TP 15 atm
Tthe water potential and osmotic potential of pure water, are
- (a)
100 and zero
- (b)
zero and zero
- (c)
100 and 200
- (d)
zero and 100
The number of oxygen molecules produced per quantum of light absorbed is
- (a)
oxygen yield
- (b)
photosynthesis yield
- (c)
quantum yield
- (d)
organic yield
Water potential of a cell is lowered by the
- (a)
addition of solutes
- (b)
addition of water
- (c)
addition of heat
- (d)
removal of heat
Out of the total amount of water absorbed by the plants, its actual percentage used during photosynthesis is
- (a)
50%
- (b)
90%
- (c)
about 1%
- (d)
25%
Assertion: A plant gridled upto bast shows signs of degeneration of flower portion.
Reason: Water transportion will cease.
- (a)
Assertion is true and Reason is correct explanation of Assertion.
- (b)
Assertion is true, but Reason is not correct explanation of Assertion
- (c)
Assertion is correct, but Reason is false
- (d)
Both Assertion and Reason are false
If turgidity of a cell surrounded by water increases, the wall pressure will
- (a)
increase
- (b)
decrease
- (c)
fluctuate
- (d)
remain unchanged
The uptake of water by substances that do not dissolve in water, resulting in swelling' of the substances is called
- (a)
Osmosis
- (b)
Diffusion
- (c)
Imbibition
- (d)
Plasmolysis
C4 plants are adapted to
- (a)
Hot and dry climate
- (b)
Temperate climate
- (c)
Cold and dry climate
- (d)
Hot and humid climate
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at higher temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
- (a)
CAM
- (b)
Nitrogen fixer
- (c)
C3
- (d)
C4
Who demonstrated that green plants purify the foul air produced by breathing animals and burning candles?
- (a)
Priestley
- (b)
Ingenhousz
- (c)
Sachs
- (d)
Engelmann
Identify the parts marked as A, B, and C in the given figure showing ATP synthesis through chemiosmosis.
- (a)
A B C Thylakoid lumen CF0 CF1 - (b)
A B C Thylakoid lumen CF1 CF0 - (c)
A B C Chloroplast lumen CF0 CF1 - (d)
A B C Chloroplast lumen CF0 CF1
Who isolated auxins from tips of coleoptiles of oat seedlings?
- (a)
Darwin and Darwin
- (b)
Went
- (c)
Skoog et al.
- (d)
Kurosawa
When temperature is increased from minimum to optimum, rate of photosynthesis doubles for every ______________rise in temperature.
- (a)
1°C
- (b)
10°C
- (c)
20°C
- (d)
30°C
Which of the following exhibits the highest rate of respiration?
- (a)
Growing shoot apex
- (b)
Germinating seed
- (c)
Root tip
- (d)
Leaf bud
The given diagram illustrates stomatal closing. The major mistake in the diagram is that
- (a)
the concentration of the K+ should be more outside the guard cells
- (b)
the concentration of the K+ should be equal on both inside and outside
- (c)
the peripheral walls of the guard cells should be thicker
- (d)
the water should move inside the guard cells.
During N2 fixation, reduction of one molecule of nitrogen into 2 molecules of NH3 consumes ________molecules of ATP.
- (a)
4
- (b)
16
- (c)
56
- (d)
38
A. The parts of plants that show deficiency symptoms also depend on mobility of the element in the plant.
B. Actively mobilised elements like N, P, Mg which are exported to young developing tissues show deficiency symptoms first in older, senescent parts.
- (a)
Only A is correct
- (b)
Only B is correct
- (c)
Both A and B are correct
- (d)
Both A and B are incorrect
Percentage of energy in glucose released by both lactic acid and alcoholic fermentation is
- (a)
5-10%
- (b)
Less than 7%
- (c)
More than 13%
- (d)
45%
Which is not a criteria for essentiality of a mineral?
- (a)
Direct role in metabolism
- (b)
Requirement is specific
- (c)
Deficiency causes hunger signs
- (d)
Dispensible for growth
C4 plants are less efficient at low temperature due to
- (a)
Low O2 affinity of PEPcase
- (b)
Cold sensitivity of PEP synthetase enzyme
- (c)
Reduced rate of decarboxylation of organic acids
- (d)
High energy requirement for CO2 fixation
Ureides are preferred forms for storage and transport of nitrogen in
- (a)
Triticum aestivum
- (b)
Solanum nigrum
- (c)
Glycine max
- (d)
Allium cepa
Which of the following is incorrect about ethylene?
- (a)
Promotes root hair formation
- (b)
It is natural and derivative of carotenoids
- (c)
It increases the number of female flowers
- (d)
It causes synchronisation of flowering and fruit set in pineapples
Find odd out w.r.t. differentiation
- (a)
Loss of nucleus in sieve
- (b)
Death of protoplasm in tracheary elements
- (c)
Callus formation
- (d)
Lignification in vessels
How many molecules of CO2 are released during two turns of Krebs cycle?
- (a)
2
- (b)
6
- (c)
4
- (d)
3