The lieutenant governor is not formally a senator and cannot vote except in cases of a tie, yet he or she has great powers over the Senate. Why

The correct answer to this open question is the following.

Although you forgot to include the options of this question, we can say the following.

The lieutenant governor is not formally a senator and cannot vote except in cases of a tie, yet he or she has great powers over the Senate because it has similar powers as the Speaker of the House.

In the government of Texas, the lieutenant governor is the second most important political figure in the state, working for the executive office. It presides the sessions at the Senate and also has the responsibility of deciding over the state budget. Its figure in the Texan Senate is such an important one, that the lieutenant governor presides almost all the sessions.