Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

$(i)$ 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