Question

Identify the type of vascular bundle in the figures (i) and (ii) and select the correct option.

• A. (i) Conjoint collateral
  (ii) Conjoint bicollateral
• B. (i) Conjoint bicollateral
  (ii) Conjoint collateral
• C. (i) Conjoint collateral closed
  (ii) Conjoint collateral open
• D. (i) Conjoint collateral open
  (ii) Conjoint collateral closed

Answer 1

The correct option is C (i) Conjoint collateral closed

(ii) Conjoint collateral open
The vascular bundle in figure i - is conjoint (xylem and phloem together), colateral (both present on the same axis) and closed (for secondary growth) because cambium is absent. Example, monocot stem.

The vascular bundle in figure ii - is also conjoint and colateral but shows presence of a cambial strip or vascular cambium in between xylem and phloem. Hence, it is open for secondary growth as in dicot stem.