Direction of transport of auxin is A) polar in basipetal B) polar in acropetal C) through xylem D) through phloem?

Question

Answer

Basipetal

Answer

The transport of auxin in plant is predominantly polar. In stems polar transport of auxin is basipetal i.e it take place from apex towards base.In roots also the auxin transport is polar but is primarily acropetal....

Answer

In stems auxins are produced  at the tip. so it move from apex towards  the base .( i.e basipetal) so a is correct.

Answer

Direction of Transport of Auxin:

A. Polar in Basipetal:
- Auxin transport can occur in a polar manner, with a basipetal direction.
- Basipetal transport refers to the movement of auxin from the shoot apex towards the base or roots of the plant.
- This transport occurs primarily in the phloem tissue.
- Basipetal transport of auxin is important for various developmental processes in plants, such as root growth, lateral root formation, and differentiation of vascular tissues.

B. Polar in Acropetal:
- Auxin transport can also occur in a polar manner, with an acropetal direction.
- Acropetal transport refers to the movement of auxin from the base or roots towards the shoot apex.
- This transport occurs primarily in the xylem tissue.
- Acropetal transport of auxin is important for processes such as stem elongation, apical dominance, leaf development, and tropic responses.

C. Through Xylem:
- Auxin can be transported through the xylem tissue.
- Xylem is responsible for the upward movement of water and minerals from the roots to the aerial parts of the plant.
- Auxin molecules can associate with water molecules and be carried along with the transpiration stream through the xylem vessels.
- This allows auxin to be transported to the upper parts of the plant, where it can have various physiological effects.

D. Through Phloem:
- Auxin can also be transported through the phloem tissue.
- Phloem is responsible for the transport of organic compounds, such as sugars, from the source (areas of production) to the sink (areas of utilization or storage).
- Auxin can be loaded into the phloem sieve tubes and transported in a polar manner, either basipetally or acropetally.
- This allows auxin to be distributed throughout the plant and influence various processes, including growth, development, and tropic responses.

In conclusion, auxin can be transported in a polar manner, either basipetally or acropetally, and can move through both xylem and phloem tissues. The direction and mode of transport depend on the specific physiological processes and the developmental needs of the plant.

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