Multiple choice

Which of the following is used for observing photosynthetic activities?

  1. Bromocresol Green

  2. Bromocresol Purple

  3. Bromophenol blue

  4. Bromothymol blue

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Bromothymol blue is a chemical indicator for weak acids and bases. The chemical is also used for observing photosynthetic activities or respiratory indicators (turns yellow as CO2 is added).