Q. No.In the transverse section of a young dicot stem, the term ‘hard bast’ will be used for the structure labeled:
1.
A
2.
B
3.
C
4.
D
Vascular bundles are continuous from the root to the stem, but different arrangements are found in two cases. What would be true for this arrangement?
| 1. | In the stem they are collateral with endarch xylem while in the root they are radial with exarch xylem |
| 2. | In the stem they are collateral with exarch xylem while in the root they are radial with endarch xylem |
| 3. | In the stem they are radial with endarch xylem while in the root they are collateral with exarch xylem |
| 4. | In the stem they are radial with exarch xylem while in the root they are collateral with endarch xylem |
The diagram shows the development of lateral roots. This development will be called as:
1. Exogenous
2. Endogenous
3. Exarch
4. Endarch
If you look at the section of a three year old eudicot stem, the vascular bundles will show:
| 1. | 3 rings of xylem and 3 of phloem. |
| 2. | 2 rings of xylem and 1 of phloem. |
| 3. | 2 rings of xylem and 3 of phloem. |
| 4. | 3 rings of xylem and 1 of phloem. |
A nail is driven in the trunk of a young tree, about 4 meters tall, at a height of about 2 meters from the ground. In a few years the tree grows to a height of 20 meters. What would be the height of the nail from the ground now?
| 1. | 2 meters | 2. | 10 meters |
| 3. | 12 meters | 4. | 18 meters |
In the given diagram if xylem is represented by 1, the companion cells will be represented by:
1. 2
2. 3
3. 4
4. 5
In the section of a monocot leaf shown in the given diagram, what would be true for the structures labeled X?
| 1. | They regulate the opening and closing of the stomata in the adaxial surface of the leaves |
| 2. | Due to presence of lignin in their walls they provide support to the leaf surface in windy conditions |
| 3. | They are involved in folding and unfolding of leaf tissue to control light intensity and reduce overall water loss |
| 4. | They are abnormal cells produced during healing of the adaxial surface after injury and are common portals of entry of viruses into the plants |
In the given diagram showing the anatomy of a tree trunk, what are A, B, C and D respectively?
| 1. | Secondary xylem, Secondary phloem, Periderm, Bark |
| 2. | Secondary phloem, Secondary xylem, Periderm, Bark |
| 3. | Secondary xylem, Secondary phloem, Phellem, Periderm |
| 4. | Secondary phloem, Secondary xylem, Phellem, Periderm |
The balloon like structures seen in vessels in the given diagram are called as:
1. Tyloses
2. Hydathodes
3. P proteins
4. Lenticells
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