Question

Function of companion cells is
(a) providing energy to sieve elements for active
transport
(b) providing water to phloem
(c) loading of sucrose into sieve elements by
passive transport
(d) loading of sucrose into sieve elements

Answer 1

d) loading of sucrose into sieve tubes

Explanation:

sieve tube do not contain nucleous hence companion cell help them to loading sucrose

Answer 2

Answer is option "d"

Explanation:

• Companion cells, sieve-tube elements, fibers, and parenchyma are all parts of the phloem, which is a vascular tissue necessary for the transport of sugars, proteins, and mRNAs from source to sink in plants.  The sieve-tube elements lack the nucleus at the maturity so they are connected by companion cells to derive the nutrient as support.
• The companion cells are particular parenchyma cells, which are firmly connected with strainer tube components. The sifter tube components and partner cells are associated by pit fields present between their regular longitudinal dividers. The companion cells help in keeping up the weight angle in the sifter tubes. They additionally work in the stacking of sucrose into strainer components effectively.
• Hence, the right answer is option d "loading of sucrose into sieve elements".