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[Bio] HELP!!!!!! challenging bio question

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HELP!!!!!! challenging bio question

can any one help me to solve this question??????? it is too difficult to me!!!!!!!
in an investigation of the mineral requirements of plants, several set-ups like the one shown below were used, each filled with a different nutrient solution. The growth and appearance of the plant in each wet-up were monitored.



(a) After a few days, plants in all the set-ups died, including the one in the control set-up which was filled with a nutrient solution containing all the minerals essential for plant growth. State a possible reason for this and suggest how the design of the set-up can be improved.
(b) why is the beakers wrapped with aluminium foil?


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冇圖好難答到你,唔知岩唔岩

(a) Not enough sun light is provided to the plant. Improve the experiment by putting the plants under environment with more sun light.

(b) Prevent algae in nutrient solution from obtaining sun light to undergo photosynthesis which may interfere the experiment

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