Question
What is the function of companion cells?
✓
Answer
- Each of these functions (i.e., collection, transport, and release of photosynthate) is intimately related to the structure and activity of companion cells associated with the sieve elements.
- companion cells in the veins of leaves function in the transfer of assimilates from photosynthetic tissues and bundle sheaths into the sieve tubes.
- companion cells also play an important role in maintaining the viability and long-distance translocation system of the enucleate sieve tube members by providing them with proteins, including informational (signaling) molecules, and ribonuclear protein complexes as well as ATP.
- Apoplastic loading, a process utilizing energy, is facilitated by carrier proteins called sucrose transporters which are located in the plasma membranes of companion cells and/or sieve tube members.
- Companion cells that function as transfer cells are characterized by extensive wall in growths that vastly increase the surface area of the plasma membrane.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Name one:
- Leguminous green fodder.
- Non-green dry fodder.
Give an example of biological weed control.
Tube feet occur in which types of animals.
Why ozone layer is called ozone umbrella/ shield?
'Milk is a very nutritious food'. Use the table given in the book to justify statement.
Explain the various preventive measures which are taken before storing the food grains.
Who classified organisms into five kingdoms?
Write down four main characteristics of good cattle shelter.
What is plant breeding?
What percent of food grains produced in our country is lost every year?