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question_answer1)
In cold and foggy areas, the limiting factor is
A)
Temperature done
clear
B)
Light done
clear
C)
Both [a] and [b] done
clear
D)
None of the above done
clear
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question_answer2)
Photosynthesis takes place
A)
Only in sunlight done
clear
B)
Only in yellow light done
clear
C)
In the visible light obtained from any source done
clear
D)
Only in very high intensity of light done
clear
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question_answer3)
Photo-oxidation of chlorophyll is called
A)
Intensification done
clear
B)
Chlorosis done
clear
C)
Solarization done
clear
D)
Defoliation done
clear
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question_answer4)
The algae found in high temperature ponds are capable of doing photosynthesis upto
A)
\[{{30}^{o}}C\] done
clear
B)
\[{{75}^{o}}C\] done
clear
C)
\[{{90}^{o}}C\] done
clear
D)
\[{{100}^{o}}C\] done
clear
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question_answer5)
What is called Warburg's effect on photosynthesis [MP PMT 2003]
A)
Low rate of the process due to \[{{O}_{2}}\]supply done
clear
B)
Low rate of the process due to\[C{{O}_{2}}\]supply done
clear
C)
Both [a] and [b] done
clear
D)
None of the above done
clear
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question_answer6)
When\[NaHC{{O}_{3}}\]is added in small quantity in an experiment showing photosynthesis, what will be the effect on it
A)
Rate will be lowered done
clear
B)
Rate will be increased done
clear
C)
Rate will be normal done
clear
D)
Process will stop done
clear
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question_answer7)
The most effective wavelength of visible light in photosynthesis is in the region of [AFMC 1989, 2003; MP PMT 1989, 2000; CPMT 1990, 2000; DPMT 1986, 87, 2004; CBSE PMT 1999; RPMT 1999; Kerala CET 2003]
A)
Violet done
clear
B)
Green done
clear
C)
Yellow done
clear
D)
Red done
clear
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question_answer8)
Compensation point is [MP PMT 1990; CPMT 1998, 99; AFMC 2002]
A)
Where there is neither photosynthesis nor respiration done
clear
B)
When rate of photosynthesis is equal to the rate of respiration done
clear
C)
When entire food synthesized into photosynthesis remain utilized done
clear
D)
When there is enough water just to meet the requirements of plant done
clear
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question_answer9)
Which one of the following is not a limiting factor for photosynthesis [CPMT 1984, 88; KCET 1999]
A)
Oxygen done
clear
B)
Carbon dioxide done
clear
C)
Chlorophyll done
clear
D)
Light done
clear
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question_answer10)
If the rate of translocation of food is slow, what will be the effect on photosynthesis [MP PMT 1988]
A)
It will increase done
clear
B)
It will remain same done
clear
C)
Becomes double done
clear
D)
It will decrease done
clear
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question_answer11)
Which of the following wavelength of light is absorbed maximum for photosynthesis [MP PMT 1990]
A)
Red light done
clear
B)
Blue light done
clear
C)
Green light done
clear
D)
Yellow light done
clear
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question_answer12)
In which of the following the rate of photosynthesis is decreased and is known as red drop [MP PMT 1992]
A)
Blue light done
clear
B)
Green light done
clear
C)
Red light more than 680 nm done
clear
D)
Red light less than 680 nm done
clear
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question_answer13)
During daylight hours, the rate of photosynthesis is higher than that of respiration, and the ratio of oxygen produced to that of consumed is [CPMT 1984]
A)
1 : 1 done
clear
B)
10 : 1 done
clear
C)
50 : 1 done
clear
D)
5 : 1 done
clear
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question_answer14)
A plant is kept in 300ppm \[C{{O}_{2}}\]concentration, what will happen to it [RPMT 1985]
A)
Plant will die soon done
clear
B)
Plant will grow but will not die done
clear
C)
Plant will show normal photosynthesis done
clear
D)
Respiration will be greatly decreased done
clear
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question_answer15)
What will be the effect of intermittent light on photosynthesis
A)
It will increase done
clear
B)
It will decrease done
clear
C)
Will not be effected done
clear
D)
Process will stop done
clear
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question_answer16)
What will be the effect when very high intensity of light is supplied to a photosynthesis system
A)
Process will increase done
clear
B)
Process will decrease done
clear
C)
Process will stop due to solarization done
clear
D)
None of the above done
clear
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question_answer17)
If water supply to the plant is extremely meagre to as to cause wilting of leaves, the rate of photosynthesis may
A)
Increase done
clear
B)
Decrease done
clear
C)
First increase than decrease done
clear
D)
First decrease than increase done
clear
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question_answer18)
Plants which can photosynthesize at as low temperature (upto\[-{{35}^{o}}C\]) are
A)
Conifers done
clear
B)
Blue-green algae done
clear
C)
Xerophytes done
clear
D)
Tropical plants done
clear
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question_answer19)
The diagram below shows three plants with identical leaf surface area
Assuming all other conditions were identical for all three plants, which of the plants would likely to photosynthesize slowest, and which fastest
A)
Y slowest, Z fastest done
clear
B)
Z slowest, X fastest done
clear
C)
X slowest, Z fastest done
clear
D)
Z slowest, Y fastest done
clear
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question_answer20)
Under conditions of constant illumination, the compensation period for a whole aquarium would be of infinite length when
A)
The biomass of animals equals the biomass of plants done
clear
B)
The respiratory exchanges of the animals are equal to the photosynthetic exchanges of the plants done
clear
C)
The oxygen intake of the animals equals of oxygen output of photosynthesis done
clear
D)
The carbon dioxide output of the animals and plants equals to the photosynthetic intake of the plants done
clear
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question_answer21)
Englemann (1882) observed accumulation of aerobic bacteria around blue and red illumination of chloroplast in green alga Cladophora. He therefore concluded that
A)
Chlorophyll absorbs green light done
clear
B)
Absorption spectrum of\[{{O}_{2}}\]evolution is blue and red done
clear
C)
\[{{O}_{2}}\]is released from\[{{H}_{2}}O\]in light reaction done
clear
D)
\[{{O}_{2}}\]is released from\[C{{O}_{2}}\]in light reaction done
clear
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question_answer22)
The rate of photosynthesis declines in the presence of red light and is increased to normal level when red light is supplemented with
A)
Far-red light done
clear
B)
Orange light done
clear
C)
Blue light done
clear
D)
Ultraviolet light done
clear
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question_answer23)
The decrease in yield of photosynthesis in the presence of red light becomes increased to normal when it is supplemented with blue light. This phenomenon is termed as
A)
Blackman's effect done
clear
B)
Emmerson's effect done
clear
C)
Englemann's effect done
clear
D)
Hill's effect done
clear
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question_answer24)
If the photosynthetic yield in blue wavelength is 10 units and that in red wavelength is 40 units; what should be the yield of photosynthesis in combination of two wavelengths, if the effect is synergistic
A)
30 units done
clear
B)
40 units done
clear
C)
50 units done
clear
D)
50 units done
clear
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question_answer25)
Emmerson defined 'red drop' as a decline in photosynthesis also termed Emmerson's effect. It appears at
A)
460 nm wavelength done
clear
B)
630 nm wavelength done
clear
C)
680 nm wavelength done
clear
D)
680 nm wavelength done
clear
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question_answer26)
DCMU is an inhibitor of
A)
PS-I done
clear
B)
PS-II done
clear
C)
Calvin cycle done
clear
D)
Krebs cycle done
clear
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question_answer27)
Q10 refers to [RPMT 1997]
A)
Quality quotient done
clear
B)
Temperature quotient done
clear
C)
Respiratory quotient done
clear
D)
Quantum constant done
clear
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question_answer28)
In nature the photosynthesis should proceed upto the limit of
A)
Light done
clear
B)
Temperature done
clear
C)
\[C{{O}_{2}}\] done
clear
D)
Moisture and wind done
clear
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question_answer29)
When a photosynthetic plant is transferred to an atmosphere of enriched\[{{O}_{2}}\], its rate of
A)
Photosynthesis would increase done
clear
B)
Photosynthesis would decrease done
clear
C)
Respiration would decrease done
clear
D)
Osmosis would increase done
clear
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question_answer30)
Which of the following would happen if the supply of\[{{O}_{2}}\]is decreased to an illuminated wheat plant
A)
Its photosynthesis would decrease done
clear
B)
Its respiration would increase done
clear
C)
Its photosynthesis would increase done
clear
D)
All the physiological process would stop done
clear
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question_answer31)
Main factor which limits the rate of photosynthesis on a clear day is
A)
Chlorophyll done
clear
B)
Light done
clear
C)
\[C{{O}_{2}}\] done
clear
D)
Water done
clear
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question_answer32)
Rate of photosynthesis is independent of [CPMT 1984]
A)
Quality of light done
clear
B)
Intensity of light done
clear
C)
Duration of light done
clear
D)
Temperature done
clear
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question_answer33)
Which of the following conditions are favourable for cyclic photophosphorylation [CPMT 1999]
A)
Anaerobic condition done
clear
B)
Aerobic and optimum light done
clear
C)
Aerobic and low light intensity done
clear
D)
Anaerobic and low light intensity done
clear
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question_answer34)
Blackman?s law of limiting factor is applied to [RPMT 1999; AIIMS 2001]
A)
Growth done
clear
B)
Respiration done
clear
C)
Transpiration done
clear
D)
Photosynthesis done
clear
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question_answer35)
Which factor not limiting in normal conditions for photosynthesis [MHCET 2003]
A)
Air done
clear
B)
\[C{{O}_{2}}\] done
clear
C)
Water done
clear
D)
Chlorophyll done
clear
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question_answer36)
Which of the following inhibits \[{{O}_{2}}\] release in light phase [DPMT 2004]
A)
PMA done
clear
B)
Zeatin done
clear
C)
DCMU done
clear
D)
None of these done
clear
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question_answer37)
Chl. a absorb's max of [MP PMT 2005]
A)
Red light done
clear
B)
Blue light done
clear
C)
Green light done
clear
D)
Yellow light done
clear
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