Multiple choice

During light reaction of photosynthesis, which of the following happens?

  1. Polysaccharides are generated in pyrenoid.

  2. Carbohydrates are synthesised from CO2 and water.

  3. Photons from sunlight are trapped to produce ATP and O2.

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Photons from sunlight are trapped to produce ATP and O2. The light reaction of photosynthesis is also called Hill reaction. This is the first step of photosynthesis where light energy from the sun is absorbed by chlorophyll and hydrolyses H2O to produce O2 and H+ ions. This H+ further reduces NADP to NADPH which finally produces ATP from ADP and Pi. This total step is called photophosphorylation.

Keep practicing — related questions