Heart attack is caused due to ?

Addition of salts and other solutes from other cells into xylem sap, __________ the water potential of the xylem sap

Symbionts which help plants in uptake of phosphorous and trace metals such as zinc and copper.

Low level of CO2 favours _________ of the stomata.

There are _________ hypothesis which may explain opening and closing of stomata?

The opening and closing of stomata is directly controlled by the______?

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