Which one is the vasoconstrictor?

Which of the following features activates the $JG$ cells?
$I.$ Fall in $GBP$
$II.$ Fall in $GBF$
$III.$ Fall in $GFR$
Choose the correct option.

Select the correct statements.
$(a)$ Angiotensin $II$ activates the cortex of adrenal gland to release aldosterone.
$(b)$ Aldosterone leads to increase in blood pressure.
$(c)$ $ANF$ acts as a check on renin-angiotensin mechanism.
$(d)$ $ADH$ causes vasodilation.
$(e)$ Vasopressin is released from adenohypophysis.
Choose the most appropriate answer from the options given below:

Select the incorrect option for Angiotensin-$II$.

The endocrine structure of the kidney is .....

Indicate whether the following statement is true or false:
$ADH$ helps in water elimination,making the urine hypotonic.