UnScramble this Word: r c k e g a w e?

Questions

Land locked country in NW Asia,capital Yerevan?

Though it shares the name of a highly poisonous plant, tea made from the needles of the_______tree is perfectly safe for consumption?

What does the E. in E.coli stand for?

the whistling teakettle, invented in 1921 in what country?

who is recognized as the creator of blue jeans?