TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: solid waste that remains after food is digested and is eliminated from the body through the anus. Answer: solid

SOLUTION: What type of waste is eliminated from the body through the anus?

PROBLEM: Passage: Structure of the trp operon. The trp operon is composed of 5 structural genes, 1 regulatory gene and other regulatory sequences, including the promoter, operator and leader sequence. Within the leader sequence is the attenuator region. In the presence of tryptophan, the structural genes are not transcribed. Answer: they are not transcribed

SOLUTION: What happens to structural genes in the presence of tryptophan?

PROBLEM: Passage: To see an animation of the lifecycle of a fern and to test your knowledge, go to the website (http://openstaxcollege. org/ l/fern_life_cycle) . Most ferns produce the same type of spores and are therefore homosporous. The diploid sporophyte is the most conspicuous stage of the lifecycle. On the underside of its mature fronds, sori (singular, sorus) form as small clusters where sporangia develop (Figure 25.23). Answer: homosporous

SOLUTION:
Most ferns produce the same type of spores and are therefore called what?