Substances which originate at the tip of the stem and control growth elsewhere are :a)Food materialb)Auxins or hormonesc)Vitaminsd)EnzymesCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

B...Auxins or harmones....Auxins are a powerful growth hormone produced naturally by plants. They are found in shoot and root tips and promote cell division, stem and root growth.that promote cell elongation

Answer

Auxins hormone controls a plant response to light and gravity. It is made by the cells present at the tip of a stem and roots. This hormone moves the plant away from light and towards gravity. It speeds up the growth of stem and slows down the growth of roots.

Auxins promote cell enlargement, cell differentiation and fruit growth.

Answer

A chemical substance produced in one part of body and regulates the activity of other parts is called as hormones. Plant hormones are produced in the stem, bud and root tips and control the plant growth, formation of flowers, stems, leaves, development, and ripening of fruit, etc. Auxins are specialized hormones which acts on the tip.

Thus, the correct answer is option B.

Answer

Explanation:

Auxins or hormones

Auxins are a class of plant hormones that are responsible for regulating plant growth. They are primarily produced in the tips of stems and are then transported to other parts of the plant where they control various growth processes.

Role of Auxins in Plant Growth:
- Auxins promote cell elongation, which is essential for the growth of plant organs such as stems and roots.
- They also play a role in phototropism, which is the growth response of plants to light. Auxins help plants bend towards a light source.
- Auxins are involved in gravitropism, which is the growth response of plants to gravity. They help roots grow downwards and shoots grow upwards.
- Auxins are also important for lateral root formation, apical dominance, and fruit development.

Transport of Auxins:
- Auxins are transported from the tip of the stem downwards towards the roots through a process known as polar auxin transport.
- This transport process involves the movement of auxin molecules from cell to cell through specialized transport proteins.

Conclusion:
Auxins or hormones originating at the tip of the stem play a crucial role in regulating plant growth and development. They control various growth processes such as cell elongation, phototropism, gravitropism, lateral root formation, and fruit development. Their transport from the tip of the stem to other parts of the plant is essential for coordinating growth responses throughout the plant.

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