In a lab investigation designed to demonstrate one aspect of photosynthesis- three test tubes were treated as shown above- The test tubes were then placed under a bright lamp for 24 hours- Which of the following is the best explanation for the observed color change in tube 2 -Test Tube Materials Added Initial Color Final Color 1 Aquatic plant-bromothymol blue solution Blue Blue 2 Aquatic plant- bromothymol blue solution- carbonated water Yellow Blue 3 Bromothymol blue solution- carbonated water Yellow Yellow

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Carbohydrate

In a lab inve...

Question

In a lab investigation designed to demonstrate one aspect of photosynthesis, three test tubes were treated as shown above. The test tubes were then placed under a bright lamp for 24 hours. Which of the following is the best explanation for the observed color change in tube 2 ?

The light bleached the solution from its original color of yellow to blue

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The aquatic plant produced carbon dioxide, which changed into carbonic acid and caused the color change

No worries! We‘ve got your back. Try BYJU‘S free classes today!

The aquatic plant used carbon dioxide, raising the pH of the solution

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

The plant produced oxygen during photosynthesis, which caused the color change

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C The aquatic plant used carbon dioxide, raising the pH of the solution
Bromothymol blue is a pH indicator. During photosynthesis, the aquatic plant used carbon dioxide, raising the pH of the solution. Due to change in pH, the colour of bromothymol changes from yellow to blue.

Suggest Corrections

Similar questions

Q. In a lab investigation designed to demonstrate one aspect of photosynthesis, three test tubes were treated as shown above. The test tubes were then placed under a bright lamp for 24 hours. Which of the following is the best explanation for the observed color change in tube 2 ?

Match the following:
$\begin{matrix} a) Litmus & 1) Blue in acidic, pink in basic soils b) Methyl orange & 2) Red in acidic, yellow in basic solutions c) Phenolphthalein & 3) Blue in basic, red in acidic solutions d) Color of Hydrangea & 4) Pink in basic, colorless in acidic solutions \end{matrix}$

Q. Aluminium sulphate and copper sulphate solutions were taken in two test tubes I and II respectively. Iron filings were then added to both the solutions. The four students A, B, C and D recorded their observations in the form of a table as given below.

Student	Aluminium sulphate solution (I)	Copper sulphate solution (II)
A	Colourless changes to light green	Blue colour of the solution is retained
B	Colour of colourless solution does not change	Blue colour of the solution changes to light green
C	Colourless solution changes to light blue	Blue colour of the solution changes to colourless
D	Colour of colourless solution remains unchanged	Blue colour of the solution fades away

The correct set of observations have been recorded by the students :
(1) A
(2) B
(3) C
(4) D

Q. Three test tubes contains different solutions and are labelled as A, B and C. The table below shows the observations when red and blue litmus papers were dipped in these test tubes.
Analyse the table given below and choose the correct options from the following.

\begin{matrix} Test tube A & Test tube B & Test tube C Red Litmus & No change & No change & No change Blue Litmus & Red & No change & Red \end{matrix}

Q. Acid/base indicator with a pK

_{a}

6.8

is Bromothymol blue. During an acid base titration, at what approximate pH, will bromothymol blue undergo a color change?

Join BYJU'S Learning Program

In a lab investigation designed to demonstrate one aspect of photosynthesis, three test tubes were treated as shown above. The test tubes were then placed under a bright lamp for 24 hours. Which of the following is the best explanation for the observed color change in tube 2 ?

The correct option is C The aquatic plant used carbon dioxide, raising the pH of the solutionBromothymol blue is a pH indicator. During photosynthesis, the aquatic plant used carbon dioxide, raising the pH of the solution. Due to change in pH, the colour of bromothymol changes from yellow to blue.

The correct option is C The aquatic plant used carbon dioxide, raising the pH of the solution
Bromothymol blue is a pH indicator. During photosynthesis, the aquatic plant used carbon dioxide, raising the pH of the solution. Due to change in pH, the colour of bromothymol changes from yellow to blue.