What plant was introduced by the indigenous population that has a high negative impact on lives today?

"The term non-native refers to plants that have been introduced from other regions or countries. ... Other non-native species such as cheatgrass (Bromus tectorum L.) have become severe weeds that often out-compete native grasses and forbs. Under some conditions, some non-native species have become invasive."

Explanation:

all freedom fighters demanded for constitution. so british finally granted india it's freedom. then a constituent assembly was formed. it's chair man was rajendra prasad and its deputy chairman was dr. br ambedkar.

this assembly take the time of about one year than our constitution was finally formed.

explanation: