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What does the action spectrum indicate?

Important Questions on Molecular Biology

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Emerson's enhancement effect and red drop have been instrumental in the discovery of:
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If a pure chlorophyll solution is illuminated with ultraviolet light, the solution appears:
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The graph below represents the absorption spectrum of a major pigment contributing to photosynthesis.

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Which one of the following best represents the photosynthetic efficiency of the pigment?

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In the figure given below, the black line (upper) indicates the action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the following:

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What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.

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Why does chlorophyll appear green in reflected light and red transmitted light? Explain the significance of these phenomena in terms of photosynthesis.

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Which fractions of the visible spectrum of solar radiations are primarily absorbed by carotenoids of the higher plants?
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Which of the following wavelength of light is absorbed maximum for photosynthesis?
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What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks?
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The most effective wavelength of visible light in photosynthesis is in the region of
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

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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
HARD

Consider the above-given figure and select the option that can be best concluded from it.
 

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In which of the following the rate of photosynthesis is decreased and is known as red drop?
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Which is the action spectrum of photosynthesis in higher plants?
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In the figure given below, the black line (upper) indicates the action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll a, answer the following:

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How can we derive an absorption spectrum for any substance?

MEDIUM

The diagram below shows three plants with identical leaf surface areas

       (x)                 (y)                (z)

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Assuming all other conditions were identical for all three plants, which of the plants would likely to photosynthesize slowest, and which fastest

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The first action spectrum of photosynthesis was described by __A__ using __B__ and __C__.
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Why does chlorophyll appear green in transmitted light and red in reflected light?
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Discovery of Emerson effect has clearly shown the existence of
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Which of the following may show photosynthesis in moonlight