When a fully developed parenchyma cell undergoes a change to regain its capacity to divide and form new tissues, a process known as dedifferentiation occurs. This is an example of how interfascicular cambium is formed in plants. Dedifferentiation is a process where mature cells revert to a meristematic state, allowing them to contribute to secondary growth by producing new vascular tissues. This contrasts with processes like:
In this context, the formation of interfascicular cambium is a classic case of dedifferentiation because it involves the conversion of mature, non-dividing parenchyma cells into a meristematic state, enabling them to contribute to the formation of new tissues in the plant.
List I | List II | ||
---|---|---|---|
A | Nucleolus | I | Site of formation of glycolipid |
B | Centriole | II | Organization like the cartwheel |
C | Leucoplasts | III | Site for active ribosomal RNA synthesis |
D | Golgi apparatus | IV | For storing nutrients |
Column-I | Column-II | ||
1. | Hypertonic | p. | Two molecules move in the same direction across the membrane. |
2. | Capillarity | q. | External solution is more concretrated than cell sap. |
3. | Symport | r. | Water loss in the form of droplets. |
4. | Guttation | s. | Ability of water to rise in thin tubes. |
A bob of heavy mass \(m\) is suspended by a light string of length \(l\). The bob is given a horizontal velocity \(v_0\) as shown in figure. If the string gets slack at some point P making an angle \( \theta \) from the horizontal, the ratio of the speed \(v\) of the bob at point P to its initial speed \(v_0\) is :