Most of the hydrolytic enzymes of lysosomes are active at which $pH$?

Which sentences are correct for lysosomes?
$1-$ It is a suicidal bag.
$2-$ It possesses one layer.
$3-$ It is a self-replicating organelle.
$4-$ It contains hydrolase type of digestive enzymes.
$5-$ It is always seen near the nucleus.
$6-$ It plays an important role in phagocytosis and pinocytosis.
$7-$ It is present in animal cells and also in plant cells.

$A$ lysosome in which intracellular organelles are digested is called:

Which organelle contains an abundance of enzymes that facilitate cell division?

The organelle important for phagocytosis and pinocytosis is ........

What happens if a lysosome bursts within the cell in which it is present?