Sieve plates are found in the ___________.

Correct option is D

Correct Answer: (D) Phloem tube cells

Explanation:

• Sieve plates are found in the phloem sieve tube cells, which are specialized cells responsible for the transport of sugars and other organic nutrients in plants.
• Sieve plates are perforated structures in the end walls of sieve tube cells that allow the flow of phloem sap (which contains sugars and other nutrients) from one sieve tube element to another.
• These cells, along with companion cells, help in the transport of food throughout the plant.

Other Options:

• Phloem fiber cells: Phloem fibers are supportive cells and do not contain sieve plates.
• Phloem companion cells: Companion cells assist sieve tube cells but do not contain sieve plates themselves.
•  Phloem parenchyma cells: These are involved in storage and transport of nutrients but do not contain sieve plates.