Question Detail
Question
Hornwort gametophytes are often characterized by mucilage-filled cavities invaded by free-living cyanobacteria, most notably Nostoc. What distinctive color does this symbiosis give the hornwort?
Correct Answer
Option C is the correct answer.
Detailed Explanation
Page 21 states: "The presence of cyanobacteria growing inside the thallus give the hornwort a distinctive blue-green color." This symbiotic relationship is unique to hornworts among bryophytes.
Hint
Read the description of hornwort gametophytes and their unique association with cyanobacteria on page 21.