Question

According to Sachs theory, the ascent of sap takes place

• A. In xylem ducts with the help of imbibition
• B. In the phloem with the help of imbibition
• C. In pith with the help of imbibition
• D. All of the above

Answer 1

The correct option is A In xylem ducts with the help of imbibition

As sap can rise upwards even in absence of living cells, physical phenomena were thought to operate in the ascent of sap like imbibition as thought by Sachs. According to 'Imbibition theory' (Sachs 1879), water moves upward in the stem through the imbibition activity of the walls of the xylem vessels, which is thought to be responsible for the ascent of sap.

So, the correct answer is 'In xylem ducts with the help of imbibition'