useless trivia: What Word Means: Horsetail Tree?

Questions

Category: 1971 Num1 Hits: "Just My Imagination" spent two weeks on the #1 spot for what group??

Category: 1971 Num1 Hits: "Knock 3 times" was a hit for this group in January of 1971.?

Category: 1971 Num1 Hits: Instead of the newspaper, this Honey Cone title could be found on the radio.?

Category: 1971 Num1 Hits: Name 1 of the 2 former Beatles that went to a solo #1 in 1971.?

Category: 1980s Hits: Girl's name in the title of a 1986 #1 from Boston...?