MCQ
Meristematic tissues include
- ALeaf tips, cork cambium and vascular cambium
- BStem and root apices, cork cambium and mature fruits
- ✓Stem and root apices, vascular cambium and cork cambium
- DMature fruits and leaf tips
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$I.$ Myosin head binds to the exposed active site on action to form a cross bridge
$II.$ The Z-line attached to these actin are also pulled in wards there by causing shortening of sarcomere also called contraction
$III.$ This pulls the attached actin filaments towards the centre of $A$-band The correct option is
$(I)$ $RBCs$ are formed in the white bone marrow in adults.
$(II)$ $RBCs$ have red colour because presence of protein called haemoglobin.
$(III)$ Nucleus is present in $RBC$ in most of the mammals and are biconcave in shape.
$(IV)$ A healthy individual has $12 -16\, gms$ of haemoglobin in every $1000\, ml$ of blood.