MCQ
First dinosaurs and first egg-laying mammals were originated in
- AJurassic period
- ✓Triassic period
- CPermian period
- DCambrian period
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$(i)$ They have a hard and non-pliable ground substance rich in calcium salts and collagen fibres.
$(ii)$ They support and protect softer tissues and organs.
$(iii)$ Osteocytes are present in the spaces called lacunae.
$(iv)$ They also interact with skeletal muscles attached to them to bring about movements.
Which of the following type of tissue is being described by above statements
$I.$ Each actin (thin filament) is made up of $2 \mathrm{~F}$ (filamentous) actins
$II.$ $F-$actin is the polymer of G (globular) actin
$III.$ $2 \mathrm{~F}=$ actins are twisted into a helix
$IV.$ Two strands of tropomyosin (protein) lies in the grooves of $F-$actin
The correct option is