Question

Identify the correct order of components with reference to their arrangement from outer side to inner side in a woody dicot stem:
I. Secondary cortex
II. Autumn wood
III. Secondary Phloem
IV. Phellem

• A. II, III, I, IV
• B. III, IV, II
• C. IV, I, III
• D. I, II, IV, III

Answer 1

The correct option is C IV, I, III

In a woody dicot stem, the arrangement of tissues from the outer side to the inner side is phellem-secondary cortex-secondary phloem-autumn wood. Phellem is the cork tissue made on the outermost side by the phellogen. Secondary cortex is on the inner side by the phellogen. Secondary phloem is produced towards the outer side by the vascular cambium and autumn wood or the secondary xylem is produced towards the inner side by the vascular cambium.

Hence, the correct answer is 'IV, I, III'.