Question

Choose the correct answer from the alternatives given.
In the Avena curvature test using unidirectional light, where does the growth take place?

• A. In the region away from light
• B. In the region exposed to light
• C. Equally in all regions
• D. No where

Answer 1

The correct option is A In the region away from light

In 1926, a graduate student from Holland by the name of Fritz Went published a report describing how he isolated a plant growth substance by placing agar blocks under coleoptile tips for a period of time then removing them and placing them on decapitated Avena stems (Went, 1926). After placement of the agar, the stems resumed growth (see below). In 1928, Went developed a method of quantifying this plant growth substance. His results suggested that the curvatures of stems were proportional to the amount of growth substance in the agar (Went, 1928). This test was called the Avena curvature test.

So, the correct option is 'In the region away from light'.