Question

Match the items in column I with column II and choose the correct option.

	List I		List II
A	Radial vascular bundle	1	Cucurbita pepo
B	Collateral vascular bundle	2	Dracaena
C	Bicollateral vascular bundle	3	Roots of angiosperms
D	Amphicribral vascular bundle	4	Sunflower stem
E	Amphivasal vascular bundle	5	Fern

• A. A- 3, B- 4, C- 1, D- 5, E- 2
• B. A- 3, B- 4, C- 2, D- 5, E- 1
• C. A- 3, B- 4, C- 5, D- 1, E- 2
• D. A- 3, B- 1, C- 4, D- 5, E- 2

Answer 1

The correct option is A A- 3, B- 4, C- 1, D- 5, E- 2

In radial vascular bundle, xylem and phloem tissues occur in separate groups on alternate radial positions. This is seen in roots. E.g., roots of angiosperms.

Collateral vascular bundles are very common type and seen in stems of dicotyledons except the members of Cucurbitaceae. 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 sunflower stem.

Bicollateral vascular bundles contain two patches of phloem on either sides of the xylem on the same radius. Example, members of Cucurbitaceae and Solanaceae.

When xylem surrounds the phloem tissue from all sides, the vascular bundle is called as amphivasal vascular bundle or leptocentric type. Such bundles are seen in monocot plant, like Dracaena after secondary growth.

When phloem surrounds the xylem tissue entirely, the vascular bundle is called as amphicribal vascular bundle or hadrocentric type. Such vascular bundles are seen in pteridophytes, like Lycopodium, Selaginella and ferns.

Thus, the correct answer is option A.