Tag: chloroplast and pigments of photosynthesis

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

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

  1. $CH _4$
  2. $C _2H _6$
  3. $C _3H _8$
  4. $C _4H _{10}$
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. Jan Ingenhousz

  2. Joseph Priestley

  3. Robert Hook

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Ultraviolet light

  2. Visible light

  3. Infrared light

  4. Microwaves
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The visible spectrum of electromagnetic radiation ranges from approximately 0.4 micrometers (violet) to 0.7 micrometers (red).

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

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?

  1. Hexose
  2. $H _2O$
  3. $O _2$

  4. GTP
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In photosynthesis, the carbon from CO2 is incorporated into glucose (a hexose sugar). If the carbon in CO2 is radiolabeled, the resulting hexose will show radioactivity.

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

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?

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

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

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

  4. (v) only
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice biology nutrition - food supplying system site of photosynthesis chloroplast and pigments of photosynthesis pigments action spectrum and absorption spectrum spectrum of electromagnetic radiation

Which cellular part is correctly described

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thylakoids are indeed flattened membranous sacs that stack to form grana. Centrioles are for spindle formation, not RNA synthesis. Chloroplast ribosomes are 70S, not 80S. Lysosomes are acidic (pH 5).