Skip to content
MathsGenie logo
Open app

Course home

  1. A Level
  3. Biology OCR A
  5. Question bank

Energy for biological processes

EasyMediumHard
12345678910111213141516
Question 8

Red algae are photosynthetic organisms that are adapted to live in deep marine environments where only certain wavelengths of light can penetrate.

A researcher studied red algae under different light conditions and made the following observations:

  • Red algae appear red in colour under white light.
  • At low light intensities, the rate of oxygen production is low.
  • Above a certain light intensity, the rate of oxygen production remains constant even if the light intensity is increased further.

Which of the following statements correctly explains these observations?

The pigments in red algae absorb red light, and light intensity is a limiting factor for the rate of photosynthesis.

The pigments in red algae absorb blue-green light, and light intensity is a limiting factor for the rate of photosynthesis.

The pigments in red algae absorb red light, and light intensity is not a limiting factor for the rate of photosynthesis.

The pigments in red algae absorb blue-green light, and light intensity is not a limiting factor for the rate of photosynthesis.

Energy for biological processes Questions

  1. A Level
  2. /Biology
  3. /Energy for biological processes