Match the semiconductor devices in Column I with their functions in Column II.
| Column I | Column II | ||
|---|---|---|---|
| (A) | LED | (I) | Voltage Regulation |
| (B) | Zener Diode | (II) | Light Emission |
| (C) | Photodiode | (III) | Light Detection |
| (D) | Solar Cell | (IV) | Converts Solar Energy into Electrical Energy |
Choose the correct answer from the options given below:

A pure silicon crystal with 5 × 1028 atoms m−3 has ni = 1.5 × 1016 m−3. It is doped with a concentration of 1 in 105 pentavalent atoms, the number density of holes (per m3) in the doped semiconductor will be:

Select the statements that are CORRECT regarding patterns of biodiversity.
Which of the following hormone is not produced by placenta ?
List - I | List - II | ||
| A | Streptokinase | I | Blood-Cholestrol lowering agents |
| B | Cyclosporin | II | Clot Buster |
| C | Statins | III | Propionibacterium sharmanii |
| D | Swiss Cheese | IV | Immuno suppressive agent |
Which of the following option determines percolation and water holding capacity of soils ?