Tag: action spectrum and absorption spectrum

Questions Related to action spectrum and absorption spectrum

The empirical formula of a hydrocarbon is $CH _{3}.$ It's molecular weight is $30$, What is molecular formula of the compound.

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis site of photosynthesis

  1. $CH _4$

  2. $C _2H _6$

  3. $C _3H _8$

  4. $C _4H _{10}$

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Correct Option: B
Explanation:

  • Formula for finding molecular formula is
  • Molecular formula= n x Empirical formula
  • Now n = molecular weight /  empirical weight
  • therefore n = 30/15
        Where 15 is the weight of the empirical formula CH3
        n=2
Now the molecular formula = 2 x CH3
                                               = C2H6
Therefore the answer option B is correct.

When does radiation inversion usually occur?

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Day time

  2. At night

  3. In the morning

  4. In the evening

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Correct Option: B

What is the name of scientist who showed that sunlight is essential for photosynthesis?

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Jan Ingenhousz

  2. Joseph Priestley

  3. Robert Hook

  4. None of the above

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Correct Option: A
Explanation:

Jan Ingen-Housz showed that sunlight is essential for photosynthesis. He concluded that green plants purify the air in presence of sunlight. Thus, option A is the correct answer.

Electromagnetic radiation with wavelengths between 0.4 and 0.7 micrometers is called:

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Ultraviolet light

  2. Visible light

  3. Infrared light

  4. Microwaves

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Correct Option: B

If the oxygen of $CO _2$ is radiolabelled and provided to the plant, then which of the following will show radioactivity in the cells exposed to sunlight?

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Hexose

  2. $H _2O$

  3. $O _2$

  4. GTP

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Correct Option: A

EMR' stands for

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Electronic Radiations

  2. Electron Radiation

  3. Electromagnetic Radiations

  4. Electron Rays

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Correct Option: C

How does solar radiations travel through space?

botany photosynthesis action spectrum and absorption spectrum spectrum of electromagnetic radiation chloroplast and pigments of photosynthesis

  1. Electromagnetic Waves

  2. Light Waves

  3. Air Waves

  4. All of above

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Correct Option: A

How many of the given structures are associated with the thylakoid membrane?
PS II, RuBisCO, LHC, PEPcase, $F _0$ of ATP synthase, cytochromes b & f.

biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. $2$

  2. $3$

  3. $4$

  4. $5$

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Correct Option: A

Read the following statements.
i) Chloroplasts get aligned with their flat surface parallel to the cell walls to receive optimum light intensity.
ii) Water is the only electron donor in all photosynthetic organisms.
iii) ATP and NADPH are utilised in Carboxylation stage of Calvin cycle.
iv) Bundle sheath cells are characterized by having a large number of chloroplasts and impervious walls.
v) Law of limiting factors was proposed by Blackmann.
Which of the given statements are CORRECT?

biology photosynthesis site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. (i), (iii) and (iv)

  2. (i), (ii) and (iii)

  3. (iii), (iv) and (v)

  4. (v) only

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Correct Option: A

Which cellular part is correctly described

biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

  1. Thylakoids - Flattened membranous sacs forming grana

  2. Centrioles - Sites for active RNA synthesis

  3. Ribosomes - Those in chloroplasts are larger (80 S) while those in cytoplasm are smaller (70 S)

  4. Lysosomes - Opimally active at 8.5 pH.

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Correct Option: A