Question

The starch sheath is another name of

• A. Hypodermis
• B. Endodermis
• C. Casparian strip
• D. None of the above

Answer 1

The correct option is B

Endodermis

The correct option is B.

Explanation of the correct option:

1. In a dicotyledonous stem, the epidermis is the outermost layer.
2. The cortex is made up of cells organized in many layers between the epidermis and the pericycle.
3. The cortex consists of three sub-zones - Hypodermis, cortical layer, and endodermis.
4. The endodermis is the cortex's innermost layer.
5. The layer is also known as the starch sheath because the endodermis cells are tightly packed with starch grains.

Explanation of the incorrect option:

Option A: The hypodermis is the cortex's outer layer, which gives the young stem its mechanical strength. The hypodermis is not referred to as the starch sheath.

Option C: The Casparian strip is a thickening in the center of the endodermis of dicot roots that looks like a band.

Final answer: The starch sheath is another name for endodermis.