PAR

Q.

What is the percentage of Photosynthetically Active Radiation (PAR) in the incident solar radiation?
(a) 100%
(b) 50%
(c) 1-5%
(d) 2-10%

Q. What percentage of PAR is captured by plants and photosynthetic bacteria?

1. 2-10%
2. 5-20%
3. 50%
4. 10-20%

Q. PAR stands for

1. Photosynthetically Adaptable Radiation
2. Photosynthetically Accessible Radiation
3. Photosynthetic Activity Radiometry
4. Photosynthetically Active Radiation

Q.

1. Blue
2. Green
3. Red
4. Violet

Q. PAR is ___.

1. Photosensitizing active radiation
2. Photosynthetically active radiation
3. Photosynthetic absorption radiation
4. None of these

Q. Which of these wavelengths is utilized by plants for photosynthesis?

1. UV
2. Visible light
3. Infrared
4. All of these

Q. The idea of two pigment systems in light reaction of photosynthesis was given by

1. Hill
2. Arnon
3. Blackman
4. None of the above

Q. Photosynthetically active radiation (PAR) represents which of the following range of wave length?

1. 400 - 700 nm
2. 500 - 600 nm
3. 450 - 950 nm
4. 340 - 450 nm

Q. If plant uses 6 percent of PAR, then percentage of I .S .R. plant use is _____.

1. 6%
2. 3%
3. 24%
4. 12%

Q. Photosynthetically least efficient radiation is

1. Blue
2. Yellow
3. Red
4. Green

Q. Amongst red, blue and violet wavelengths, which one is most efficient for photosynthesis?

1. Red
2. Blue
3. Violet
4. None of the above

Q. Which of the following wavelength is absorbed maximum for photosynthesis?

1. 660 nm
2. 680 nm
3. 440 nm
4. 700 nm

Q. Regarding assertion and reason choose the right option
Assertion [A]: Only some fraction of the total solar energy input is utilized by plants.
Reason [R]: Of the total solar radiation, only a certain spectrum is used by plants, and this region of the spectrum is called PAR.

1. Both A and R are true and R explains A
2. Both A and R are true R does not explain A
3. Both A and R are false
4. A is true and R is false