Question

Match the types of vascular bundles with examples given. Choose the answer which gives the correct combination of the alphabets of the two columns.

	List I		List II
A	Collateral and open	1	Cucurbita stem
B	Radial	2	Ferns
C	Bicollatral	3	Maize root
D	Concentric	4	Sunflower
		5	Maize stem

• A. A- 4, B- 3, C- 1, D- 2
• B. A- 3, B- 4, C- 1, D- 2
• C. A- 4, B- 3, C- 2, D- 1
• D. A- 4, B- 1, C- 3, D- 2

Answer 1

The correct option is A A- 4, B- 3, C- 1, D- 2

In radial vascular bundle, xylem and phloem tissues occur in separate groups on alternate radial positions. This is seen in roots of both dicots and monocots. Example, maize roots.

Bicollateral vascular bundles contain two patches of phloem on either sides of the xylem on the same radius. The outer phloem or external phloem remains towards the periphery of the central cylinder and inner or internal phloem remains towards the centre. Example, members of Cucurbitaceae and Solanaceae.

Collateral vascular bundles are very common type and seen in stems of dicotyledons except the members of Cucurbitaceae and some members of Convolvulaceae. Cambium may be present or absent in between xylem and phloem patches making the vascular bundle open or closed respectively. Collateral open vascular bundles are present in dicots stem. Example, sunflower stem.

Amphicribal vascular bundles are types of concentric vascular bundles, found in ferns.

Thus, the correct answer is option A.