NEET Biology question

G H Shull observed inbreeding depression in a plant. Miller and Letham isolated a hormone from the immature seeds of that plant. Which of the following characters is not associated with the plant?

(A)Atactostelic condition in stem
(B)Bundle sheath in leaf
(C)Chromosomal number of endospermous cell is 30
(D)Medulla absent in the rootCorrect

Answer: (D)

Solution

G.H. Shull studied inbreeding depression and hybrid vigour in maize (Zea mays), and the cytokinin zeatin was isolated from immature maize kernels by Letham (with Miller's independent work on cytokinins). Maize, being a monocotyledon, shows a scattered arrangement of vascular bundles in its stem (atactostele) — so

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Question ID VK-105174