Stem elongation is affected by :-a)Gibberellin and florigenb)Auxin and gibberellinc)Florigen and kinind)Kinin and auxinCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Auxin and Gibberellin are known as growth hormones of plant. so stem elongation is also a kind of growth of stem. therefore, stem elongation is affected by hormones Auxin and Gibberellin.

Answer

Auxin and Gibberellin are known as growth hormones of plant. so stem elongationis also a kind of growth of stem. therefore, stem elongation is affected by hormones Auxin and Gibberellin.

Answer

Stem elongation is a process in plants where the stem grows in length. It is an important aspect of plant development as it allows the plant to reach for sunlight and optimize photosynthesis. The process of stem elongation is influenced by various plant hormones, including auxin and gibberellin.

1. Auxin:
- Auxin is a plant hormone that plays a crucial role in stem elongation. It is produced in the apical meristem, which is the growing tip of the plant.
- Auxin promotes cell elongation by increasing the plasticity of the cell walls, allowing them to expand and stretch. It also stimulates cell division in the cambium layer, leading to an increase in the number of cells available for elongation.
- Additionally, auxin promotes the transport of sugars and other nutrients to the growing regions of the plant, providing the necessary energy for cell elongation.

2. Gibberellin:
- Gibberellin is another plant hormone that influences stem elongation. It is produced in the young leaves, roots, and developing seeds of the plant.
- Gibberellin promotes stem elongation by stimulating cell division and elongation. It activates enzymes that break down the cell wall components, allowing the cells to expand and elongate.
- It also promotes the synthesis of auxin, further enhancing the effects of auxin on stem elongation.
- Gibberellin is particularly important in the elongation of internodes, which are the segments between nodes on the stem.

3. Interaction between auxin and gibberellin:
- Auxin and gibberellin work in synergy to promote stem elongation. Auxin stimulates the synthesis of gibberellin, which in turn enhances the effects of auxin.
- The combined action of these hormones leads to increased cell division and elongation, resulting in stem elongation.
- Additionally, auxin and gibberellin also regulate other aspects of plant growth, such as branching and flowering.

In conclusion, stem elongation in plants is influenced by the plant hormones auxin and gibberellin. These hormones work together to stimulate cell division and elongation, allowing the stem to grow in length.

Answer

Auxin and Gibberellin..!

Top Courses for NEETView all

Daily Test for NEET Preparation

NEET Mock Test Series - Updated 2026 Pattern

Topic-wise MCQ Tests for NEET

Biology Class 11

DPP: Daily Practice Problems for NEET

Top Courses for NEET

Top Courses for NEET

Related Content

Mock Test & Practice

Main Subjects

Guided Learning

Revision

Competitive & Government Exams