Biology
Which one of the following processes takes place in lakes during eutrophication?

Excessive entry of nutrient into water
Rapid destruction of algal growth
Loss of dissolved nutrients from water
Excessive availability of dissolved oxygen

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Biology
Plants are killed in winter by frost

because respiration ceases at such low temperature
because of desiccation and mechanical damage to the tissues
because no photosynthesis takes place at such low temperature
because there is no transpiration

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