MCQ
A fibre derived from a tracheid is
- ALibriform fibre
- ✓Fibre tracheid
- CWood fibre
- DBast fibre
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| 1. | Cytoskeleton | A. | Hair-like outgrowth |
| 2. | Flagella | B. | Proximal region of centriole |
| 3. | Hub | C. | Bristle-like structures |
| 4. | Fimbriae | D. | Filamentous protein structure |
$\begin{array}{|l|l|} \hline Column\,\,-I & Column\,\,-II \\ \hline (a)\,\,Hinge\,\,joint & (1)\,\,Between\,\,atlas\,\,and\,\,axis \\ \hline (b)\,\,Pivot\,\,joints & (2)\,\,Humerus\,\,and\,\,wrist \\ \hline (c)\,\,Ball\,\,and\,\,rocket\,\,joint & (3)\,\,Knee\,\,joint \\ \hline (d)\,\,Gliding\,\,joint & (4)\,\,Shoulder \\ \hline \end{array}$
$R$ : It has tetrach vascular bundles usually.
$(i)$ All the cells of the epithelium are held together with little intercellular materials.
$(ii)$ In almost all animal tissues specialized junction provide both structural and functional link between its individual cells.
$(iii)$ Tight junctions help to stop substances from leaking across a tissue.
$(iv)$ Adhering junctions provide cementing to keep neighbouring cells together.
$(v)$ Gap junctions provide cytoplasmic channels between cells for passage of ions, small molecules and sometimes big molecules.