Stem elongation caused by

Gibberellin and florigen

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Auxin and gibberellin

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Florigen and kinin

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Kinin and auxin

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Solution

The correct option is B Auxin and gibberellin
Auxin and gibberellin are growth promoting phytohormones. Auxin word is derived from Greek 'auxein' meaning to grow. The term auxin is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth regulating properties. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action. Gibberellic acid (GA3) was one of the first gibberellins to be discovered and remains the most intensively studied form. All GAs are acidic. They produce a wide range of physiological responses in the plants. Their ability to cause an increase in length of axis is used to increase the length of grapes stalks. Gibberellins, cause fruits like apple to elongate and improve its shape.

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Similar questions

Q. The gibberellins are plant growth hormones. They cause elongation of stem. Gibberellin was first isolated by Japanese workers from .........

Q. Read the given statements and select the correct option.
Statement 1: Elongation of reduced stem is possible due to application of gibberellin hormone.
Statement 2: Gibberellin stimulates cell division and cell elongation.

Assertion (A): Genetically dwarf plants on treatment with gibberellins attain the size of normal plants

Reason(R): Gibberellins cause enormous cell elongation and intermodal length

Q. Gibberellins differ from auxins since they cause

The dwarf variety of garden pea plants are now known to have a mutation in a gene needed for synthesis of gibberellin. $F_{1}$ plant obtained by Mendel from the tall (TT) $\times$ dwarf (tt) cross were tall.
Which of the following inferences can be drawn from the given information?
(i) Gibberellin causes elongation of stems.
(ii) Heterozygous (Tt) plants produce the same amount of gibberellin as homozygous dominant (TT) plants.
(iii) Gibberellin induces production of auxin.
(iv) Mutation may have occurred in a gene producing an enzyme.

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