MCQ
The special contractile protein actin is found in
- AThick filaments of $A$-bands
- ✓Thin filaments of $I$-bands
- CBoth thick and thin bands
- DWhole of myofibril
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$II.$ 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
$R-$ It reduce the chromosomes number by half while making the gametes.
$(i)$ In animalia, the mode of nutrition is autotrophic.
$(ii)$ In monera, the nuclear membrane is present.
$(iii)$ In protista, the cell type is prokaryotic.
$(iv)$ In plantae, all organisms have cell wall. Of the above statements, which one is correct?