Question

Loading of sucrose into sieve tube cells is by (i)_______ and the unloading of sucrose from the sieve tube cells is by (ii)________.

• A. (i) active transport (ii) passive transport
• B. (i) passive transport (ii) active transport
• C. (i) active transport and (ii) active transport
• D. (i) passive transport and (ii) passive transport

Answer 1

The correct option is C

(i) active transport and (ii) active transport

Sucrose is loaded into sieve tube cells by active transport. Again active transport is necessary to move sucrose out of sieve tube cells.