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Answer
(1 → Q), (2 → P)
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| 'A' | 'B' | |
| $Q.1$. Ozone | $(a)$ | Water pollution |
| $Q.2$. Accumulation of pesticides in the water | $(b)$ | Biological magnification |
| $(c)$ | A deadly poison | |
| Column I | Column II |
| Q.1. Sodium nitrite | p. $NaNO _2$ |
| Q.2. Sodium nitrate | q. $NaNO _3$ |
| r. $Na _2 CO _3$ |
| Column I | Column II |
| Q.1. Converging mirror | p. It is used as rear- view mirror in vehicles |
| Q.2. Diverging mirror | q. It is used in the design of solar furnaces |
| r. It is used in a dressing-table |
| Column I | Column II |
| Q.1. Human eye or eyeball | a. The capacity of eye to see objects clearly between 25 cm and infinite distance. |
| Q.2. Self operated accommodation power of eye | b. Uneven atmosphere |
| c. Works as a photographic camera. |
| Column I | Column II | ||
| Q.1. | Guard cells | p. | Breakdown of pyruvate using O2 |
| Q.2. | Food vacuole | q. | Stomatal pore |
| r. | Digestion |
| Column I (Colour) | Column II (Substance) |
| Q.1. Green | a. Copper sulphate |
| Q.2. Blue | b. Barium sulphate |
| c. Ferrous sulphate |
| Column I | Column II |
| Q.1. Animals feed on plants as well as animals | p. Carnivores |
| Q.2. Organisms obtain nutrition from decaying organic matter | q. Omnivores |
| r. Decomposers |
| Column I | Column II | ||
| Q.1. | Y-chromosome | p. | Genetical trait |
| Q.2. | Inheritance | q. | Segment of DNA |
| r. | Male sex |
| Column I | Column II | ||
| Q.1. | Photosynthesis | p. | Sucrose |
| Q.2. | Respiration | q. | Energy stored |
| r. | Energy released |
| Column I | Column II |
Q.1.  | a. Electric cell |
Q.2.  | b. Ammeter |
| c.Two conrincing |