Quantasome, Absorption Spectrum and Action Spectrum
Quantasome, Absorption Spectrum and Action Spectrum: Overview
This Topic covers sub-topics such as Absorption Spectrum and Photosynthetic Unit
Important Questions on Quantasome, Absorption Spectrum and Action Spectrum
A student working in a lab had three tubes with the following preparations:
(i) Freshly extracted nucleic acids dissolved in a buffer.
(ii) Chlorophyll extracted from spinach leaf.
(iii) Red coloured anthocyanin from onion cells.
The student used a spectrophotometer to determine the wavelength of light at which each preparation would show maximum absorption (absorption spectrum). She noted down the values in her notebook. However, when she came to the lab the next day, she realised that she had not mentioned the name of the sample preparation against each value. The values she recorded were 480 nm, 260 nm, and 642 nm. The respective values for the sample (i), (ii), and (iii) would most likely be:
Define a photosynthetic unit.
Which of the following wavelengths of light is most effective for photosynthesis?
The most effective wavelength of light for photosynthesis is
Assertion: There is a decrease in photosynthesis, if the photosynthetic cells are illuminated by light of or more wavelength.
Reason: In red drop phenomenon the rate of photosynthesis decreases.
Photosynthesis takes place:
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the followings:
If chlorophyll a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?
Observe the graphs given below and choose the options correctly describing the color of Pigments 1, 2, and 3 in a chromatogram.
Effectiveness of different wavelength of light on photosynthesis is measured by
Which of the following may show photosynthesis in moonlight
Which of the following wavelength of light is absorbed maximum for photosynthesis?
The most effective wavelength of visible light in photosynthesis is in the region of
Which of the following wavelength occur in red part of the spectrum
What is PAR range?
Match the following and choose the correct combination from the given options.
| Column-I | Column- II |
|---|---|
| (A) Visible light | (1) 0.1 to 1 nm |
| (B) Ultra violet | (2) 400 to 700 nm |
| (C) X-rays | (3) Longer than 740 nm |
| (D) Infra-red | (4) 100 to 400 nm |
| (5) < 0.1 nm |
Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
Photosynthetically active radiation is represented by the range of wavelength of
