Question
Primary and secondary succession.
| Primary succession | Secondary succession |
| 1. The primary succession starts in the area where no living organisms ever existed. | 1. The secondary succession starts in an area which has lost all the living organisms once existed. |
| 2. Areas where primary succession starts are bare rock, newly formed pond, newly cooled lava, etc. | 2. Abandoned farm, cut or burnt forest, flooded land’, etc. are areas where secondary succession begins. |
| 3. Primary succession is a very slow process. | 3. Secondary succession is comparatively a faster process. |
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| Column A | Column B |
| (1) Nutritive tissue of embryo | (a) Perisperm |
| (2) Remnants of nucellus in seed | (b) Cotyledon |
| (3) Nutritive tissue of developing microspores | (c) Endosperm |
| (4) First photosynthetic organ of embryo | (d) Tapetum |
| Column A | Column B |
| (1) Glucagon | (i) Neurohypophysis |
| (2) Adrenaline | (ii) Islets of Langerhans |
| (3) Somato tropins | (iii) Adenohypophysis |
| (4) ADH | (iv) Medulla |