Question

Match items of column I and column II

	Column I		Column II
a	Collateral and open	p	Cucurbita stem
b	Radial	q	Fern
c	Bicollateral	r	Maize Root
d	Concentric	s	Sunflower
		t	Maize stem

• A. a-t, b-s c-r, d-p
• B. a-s, b-r c-p, d-q
• C. a-s, b-p c-r, d-q
• D. a-s, b-r c-q, d-p

Answer 1

Answer: (B)

a-s, b-r c-p, d-q

Vascular bundles are conjoint, collateral, endarch, open and arranged in a ring surrounding pith (eustele). Example - Sunflower.

The vascular bundles are radial. Xylem and phloem occur in separate patches arranged on alternate radii, intervened by small parenchyma cells. Example - Maixe Root.

In a bicollateral bundle, the phloem is both outside and inside the xylem, as in Solanaceae (the potato family) and Cucurbitaceae (the cucumber family).

Concentric: xylem and phloem elements form concentric rings in cross section. In hadrocentric (amphicribral) bundles phloem surrounds the ring of the xylem (ferns).

So, the correct answer is 'a-s, b-r c-p, d-q.'