MCQ
The abscission layer is covered by a leaf scar which is composed of
- APectose and cellulose
- ✓Suberin
- CPectin
- DCutin
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| Gas | Atmospheric Air | Alveoli |
| $O_{2}$ | $159$ | $A$ |
| $CO _{2}$ | $0.3$ | $B$ |
$\begin{array}{|l|l|} \hline Column\;-I & Column\;-II \\ \hline A.\;Micro\;filament & i.\;Glycokalyx \\ \hline B.\;Micro\;tubule & ii.\;Actin \\ \hline C.\;Flagella & iii.\;Tubulin \\ \hline D.\;Outer\;layer\;of\;bacteria & iv.\;Outer\;compartment \\ \hline \end{array}$
$II.$ 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