PART - 1 - Unit I : CH - 3 Plant Kingdom — 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

$I.$ Diffusion membrane is made up of $3$ layers

$II.$ Solubility of $CO _{2}$ in blood is higher than $O _{2}$ by $25$ times

$III.$ Breathing volumes are estimated by spirometer

$IV.$ High $H ^{+}$ in blood favours oxygen dissociation

Choose the correct option