STD 11 - 2. Biology classification — BIOLOGY STD 11 Science — Question

$II.$ The neural system provides an organized network of point to point connection for a quick coordination.

$III.$ The neural organization is very complex in lower invertebrates.

$IV.$ The human neural system includes $CNS$ and $PNS$

Select the correct statements.

$(i)$ Plant cells have centrioles which are absent in almost all animal cells.

$(ii)$ Ribosomes are the site of protein synthesis.

$(iii)$ The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.

$(iv)$ In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum.

Of the above statements