Question

These are three sets of vascular bundles pick up appropriate match from set II

Set I
1. What types of vascular bundles A, B, and C?
2. What is the unique feature seen of A?
3. Where will you trace A?
4. Where will you trace B?
5. Where will you trace C?
6. Which of these is suggesting that secondary growth occurs?
Set II
(a) A-Collateral open, B-Collateral closed, C-Concentric
(b) A-Collateral closed, B-Collateral open, C-Radial
(c) Monocot stern
(d) Dicot and gymnosperm stem
(e) roots
(f) B
(g) Protoxylem lacuna is exceptional to monocot stem.

• A. 1 - b, 2 - g, 3 - c, 4 - d, 5 - e, 6 - f
• B. 1 - c, 2 - g, 3 - b, 4 - d, 5 - e, 6 - f
• C. 1 - b, 2 - e, 3 - c, 4 - d, 5 - g, 6 - f
• D. 1 - f, 2 - g, 3 - c, 4 - d, 5 - e, 6 - b

Answer 1

The correct option is A 1 - b, 2 - g, 3 - c, 4 - d, 5 - e, 6 - f

Radial vascular bundle - In these types of vascular bundles, xylem and phloem tissues occur in separate groups on alternate radial positions. This is seen in roots.
Collateral open - Xylem towards the inner side and phloem towards the outer side. In between xylem and phloem, cambium is present. For example dicot stem.
Collateral closed - Xylem towards the inner side and phloem towards the outer side. In between xylem and phloem, cambium is absent.
Secondary growth occurs only in dicots due to the presence of cambium. Sometimes, the either xylem surrounds the phloem tissue or vice versa. Such vascular bundles are called as concentric vascular bundles.
Therefore, the correct answer is option B.