Answer
414.9k+ views
Hint: The Avena curvature test is a bioassay for the activity of a plant hormone that promotes cell elongation and it is produced at the stem tip. It travels to the darker side of the plant and causes the cells to grow larger compared to the cells on the lighter side of the plant.
Complete step by step answer:
F.W. Went suggested the Avena coleoptile curvature assay for auxin bioassay. In this, an auxin-containing agar block is positioned on one side of the coleoptile oat and the curvature angle of the decapitated Avena coleoptile is measured.
The increased concentration of auxin on one side promotes cell elongation, although the decreased concentration of auxin on the other side induces decreased growth rate as a result of the absence of coleoptile tips. This differential pattern of growth induces coleoptile curvature.
A bioassay for auxin-type growth regulators is the Avena geo-curvature test. This is for indole-3-acetic acid (IAA) .
So, the correct answer is, ‘Auxin’.
Additional information: Ethylene is considered a multifunctional phytohormone that controls both development and senescence. Depending on its concentration, the timing of application, and the plant species, it promotes or inhibits growth and senescence processes.
Cytokinins are a class of plant growth substances (phytohormones) that in plant roots and shoots promote cell division, or cytokinesis. They are mainly involved in the growth and differentiation of cells, but also influence apical dominance, growth of axillary buds, and leaf senescence.
Gibberellins are plant hormones that control various processes of development, including elongation of the stem, germination, dormancy, flowering, flower development, and senescence of the leaf and fruit. It is one of the longest known plant hormone groups.
Note: Different bioassays are available to assess the auxin hormone concentration in plants, such as the Avena curvature test, split pea stem curvature test, cress root inhibition test, etc. After placing an agar block containing auxin on one side, it tests the angle of the curvature of a decapitated coleoptile.
Complete step by step answer:
F.W. Went suggested the Avena coleoptile curvature assay for auxin bioassay. In this, an auxin-containing agar block is positioned on one side of the coleoptile oat and the curvature angle of the decapitated Avena coleoptile is measured.
The increased concentration of auxin on one side promotes cell elongation, although the decreased concentration of auxin on the other side induces decreased growth rate as a result of the absence of coleoptile tips. This differential pattern of growth induces coleoptile curvature.
A bioassay for auxin-type growth regulators is the Avena geo-curvature test. This is for indole-3-acetic acid (IAA) .
![seo images](https://www.vedantu.com/question-sets/0105f882-110e-4217-9b38-9795854bae951749677152468688269.png)
So, the correct answer is, ‘Auxin’.
Additional information: Ethylene is considered a multifunctional phytohormone that controls both development and senescence. Depending on its concentration, the timing of application, and the plant species, it promotes or inhibits growth and senescence processes.
Cytokinins are a class of plant growth substances (phytohormones) that in plant roots and shoots promote cell division, or cytokinesis. They are mainly involved in the growth and differentiation of cells, but also influence apical dominance, growth of axillary buds, and leaf senescence.
Gibberellins are plant hormones that control various processes of development, including elongation of the stem, germination, dormancy, flowering, flower development, and senescence of the leaf and fruit. It is one of the longest known plant hormone groups.
Note: Different bioassays are available to assess the auxin hormone concentration in plants, such as the Avena curvature test, split pea stem curvature test, cress root inhibition test, etc. After placing an agar block containing auxin on one side, it tests the angle of the curvature of a decapitated coleoptile.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Why Are Noble Gases NonReactive class 11 chemistry CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let X and Y be the sets of all positive divisors of class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x and y be 2 real numbers which satisfy the equations class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x 4log 2sqrt 9k 1 + 7 and y dfrac132log 2sqrt5 class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Let x22ax+b20 and x22bx+a20 be two equations Then the class 11 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
At which age domestication of animals started A Neolithic class 11 social science CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Which are the Top 10 Largest Countries of the World?
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Give 10 examples for herbs , shrubs , climbers , creepers
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Difference Between Plant Cell and Animal Cell
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Write a letter to the principal requesting him to grant class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Change the following sentences into negative and interrogative class 10 english CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)
Fill in the blanks A 1 lakh ten thousand B 1 million class 9 maths CBSE
![arrow-right](/cdn/images/seo-templates/arrow-right.png)