STD 11 - 19. Chemical coordination and integration — BIOLOGY STD 11 Science — Question

$(i)$ Mesosome is formed by the extensions of plasma membrane into the cell.

$(ii)$ The pili are elongated tubular structures made up of a protein.

$(iii)$ Flagellum is composed of filament, hook and basal body.

$(iv)$ Ribosomes are about $30\; nm$ by $50\; nm$ in size.

Types of leucocytes               Function

$A.$ Neutrophils                         $1.$ Heparin and histamine secretion

$B.$ Basophils                            $2.$ Antibodies formation

$C.$ Acidophils                           $3.$ Scavanger

$D.$ Monocytes                          $4.$ Phagocytes

$E.$ Lymphocytes                       $5.$ Antiallergic and healing of wounds

The correct pairing sequence is

Choose the correct option for $A, B$ and $C$ to complete the given $NCERT$ statement