Final answer:
Neville Longbottom and Pomona Sprout utilized matured Mandrakes and the Venomous Tentacula as defensive weapons during the Battle of Hogwarts to fight against Death Eaters.
Step-by-step explanation:
Neville Longbottom and Pomona Sprout used Mandrakes as weapons against the invading Death Eaters during the Battle of Hogwarts. Mandrakes are plants with human-like roots that have a cry that is fatal to anyone who hears it. In the book 'Harry Potter and the Deathly Hallows,' matured mandrakes are deployed during the battle to incapacitate enemies with their lethal screams. Additionally, the Venomous Tentacula is also mentioned as part of the magical plants used defensively in the battle, thanks to its harmful properties and ability to attack intruders