how sexual reproduction enables organisms like algae and fungi to survive during unfavourable conditions? why is sexual reproduction favoured under such conditions/

Sexual reproduction does not enables organisms like algae and fungi to survive during unfavourable conditions. Instead, during unfavourable conditions, these organisms form an outer thick covering around themselves called cyst which helps them in surviving under these conditions. 

On the arrival of the favourable conditions, the cyst ruptures and the organism is released. Also, it is not a type of reproduction at all. 

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