STD 11 - 10. Cell cycle and cell division — BIOLOGY STD 11 Science — Question

$(I)$ In human body, it is made of number of muscle bundles.

$(II)$ Muscle bundles contains a number of muscle fibers and fiber is lined by the sarcollemma.

$(III)$ In Muscle fiber, sarcoplasm contains only one nucleus.

$(IV)$ In muscle fiber, sarcoplasmic reticulum is the store house of calcium ions.

$(a)$ Complete disintegration of the nuclear envelope marks the start of the second phase of mitosis.
$(b)$ Metaphase chromosome is made up of one sister chromatid.

$I.$ skin $II.$ lungs

$III.$ liver $IV.$ sebaceous gland

Choose the correct option

$R$ : All the three phyla include members with bilateral symmetry and true coelom.