Multiple choice Aplanogametangia refers to conjugation tube formed in Scalariform conjugation two parallel strands of Spirogyra united with each other by a conjugation tube conjugation tube formed in lateral conjugation gametes produced in gametangia Reveal answer Fill a bubble to check yourself B Correct answer Explanation Two parallel strands of Spirogyra united with each other by a conjugation tube is referred to as aplanogametangia.