Some organisms suspend their metabolic activities to survive in unfavourable conditions. Explain with the help of any four examples.

Some microbes like bacteria, fungi and lower plants produces thick walled spores which helps them to survive in unfavourable condition. Higher plants produces seeds which reduces metabolic activity and remain dormant in stress condition but they start germination in favourable conditions. In animals some species migrate, some hibernate and some aestivate to overcome the unfavourable conditions. Some aquatic organisms enters into diapause during unfavourable conditions e.g., zooplanktons.