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. |
AB is a part of an electrical circuit (see figure). The potential difference \(V_A - V_B\), at the instant when current \(i = 2\) A and is increasing at a rate of 1 amp/second is:
Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained at temperature 3T and the right end at T. The rods are thermally insulated from outside. In steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(T_1 / T_2\) is 
