Question

Which character is not associated with plant where Shull studied inbreeding depression while Miller and Letham extracted a hormone from its seeds?

• A. Atactostele in stem
• B. Bundle sheath in leaf
• C. chromosome number $30$ in endosperm
• D. Medulla absent in root

Answer 1

The correct option is D Medulla absent in root

Shull studied inbreeding depression in maize. Miller and Letham extracted a hormone from its seeds of the plant maize. Maize is a monocotyledon.The root anatomy shows, outer epidermis, middle cortes and central stele with pericycle, medulla, vascular bundles, conjunctive tissue. In the anatomy of the stem. outer epidermis,inner small ring of sclerenchymatous hypodermis and large ground tissue in which vascular bundles are scatteredly arranged. In this, general cortex, endodermis, pericycle, medulla, medullary rays are absent. The leaf anatomy shows, upper and lower epidermises, middle mesophyll with spongy parenchyma and vascular bundles.

So, correct option is 'Medulla absent in root'.