The internal layer joining the primary walls of the two adjacent cells is known as

The organelle labelled by which alphabet is absent in animal cells?

Match the following columns correctly.

Column-$I$ (Cell wall)	Column-$II$ (Constituent)
$a$. Algae	$i$. Chitin
$b$. Fungi	$ii$. Mannans
$c$. Other plants	$iii$. Pectin
$d$. Middle lamella	$iv$. Cellulose

$A$ student placed two cells in the same solution in two different containers. The observation was given in the table:

Container	Observation
$1$	Cell burst
$2$	Cell does not change its shape

Which structure maintains the shape of the cell present in container $2$ and provides the most significant difference between the two cells?

Middle lamella is composed mainly of

Plant cells do not burst in distilled water,because