MCQ
Why thyroxine is a hormone not an enzyme
- AIt is secreted in small quantity
- BIt is not a polypeptide
- CIt has no special effect
- ✓It is directly poured into blood
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| List $I$ | List $II$ |
| $A.$ Pleurobrachia | $I.$ Mollusca |
| $B.$ Radula | $II.$ Ctenophora |
| $C.$ Stomochord | $III.$ Osteichthyes |
| $D.$ Air bladder | $IV.$ Hemichordata |
Choose the correct answer from the options given below :
$(a)$ $'H'$ zone disappears
$(b)$ $'A'$ band widens
$(c)$ $'I'$ band reduces in width
$(d)$ Myosine hydrolyzes $ATP,$ releasing the $ADP$ and $\mathrm{Pi}$
$(e)$ $Z-$lines attached to actins are pulled inwards Choose the correct answer from the options given below.
$II.$ Tracheids/vessels elements are larger during periods when water is abundant
$III.$ Tracheids/vessels elements have thicker wall during periods of water deprivation
$IV.$ Wood formed in the previous years is darker than newer wood
Select the combination of correct statements from the options given below