Avena curvature test was first of all done by(a)J.C.Bose(b)F.W.Went(c)Thimann(d)Skoog

The correct answer is (b) F.W. Went.
1. Avena Curvature Test:
o The Avena curvature test is an experiment used to study phototropism, which is the growth response of plants towards or away from light.
o The test involves using oat (Avena) coleoptiles, which are young, growing shoots of oat plants. These coleoptiles are placed in a controlled environment where one side is exposed to light, and the other side is shaded.
o The curvature of the coleoptile is observed, as it bends towards the light, a process known as positive phototropism. This curvature occurs due to the differential distribution of auxin, a plant hormone that promotes growth on the shaded side of the plant, causing it to grow faster and thus bend toward the light source.
2. F.W. Went:
o F.W. Went (Frits Went) was a Dutch botanist who first used the Avena curvature test in 1926 to demonstrate the role of auxin in plant growth and phototropism. Went's experiment was one of the first to show that light causes the redistribution of auxin in plants, which leads to growth on the shaded side and results in the curvature toward the light.
o Went's research was crucial in advancing the understanding of plant hormones and their role in growth and development.
3. Why the Other Options Are Incorrect:
o (a) J.C. Bose: J.C. Bose was an Indian scientist who made significant contributions to the study of plant physiology and biophysics, including work on plant responses to stimuli like light and heat. However, the Avena curvature test was not his experiment.
o (c) Thimann: Thimann was another botanist who contributed to the study of plant hormones, particularly auxin, but he was not the first to conduct the Avena curvature test.
o (d) Skoog: Skoog was a prominent botanist known for his work on plant tissue culture and plant growth regulators, but he did not conduct the Avena curvature test.
The Avena curvature test was first done by F.W. Went, making (b) F.W. Went the correct answer.