Question

Secondary growth in dicot stem is possible because of the presence of

• A. Xylem
• B. Phloem
• C. Cambium
• D. Medullary rays

Answer 1

The correct option is C

Cambium

The correct option is C:

Explanation of the correct option:

Option C:

1. Secondary growth refers to the increase in girth of the stem due to the deposition of secondary tissue.
2. This secondary growth occurs in dicot stems due to the presence of a secondary meristem called cambium.
3. Cambium is a group of actively dividing cells that are present in between xylem and phloem.
4. This cambium gives rise to secondary xylem and secondary phloem which increases the girth.

Explanation of the incorrect option:

Option A:

Xylem is a vascular conductive tissue responsible for the transport of water in different areas of plants.

Option B:

Phloem is a vascular conductive tissue responsible for the transport of prepared food to different areas of plants.

Option D:

Medullary rays are a parenchymal strip of cells found in between vascular bundles.

Final answer: The secondary growth in dicot stems occurs due to the presence of cambium.