Q. No.Match each item in Column I with one in Column II and selct the correct match from the codes given:
COLUMN I
COLUMN II
A
Dicot stem
P
Vascular bundles are arranged in a ring
B
Monocot stem
Q
Pith is small or inconspicuous
C
Dicot root
R
Vascular bundles are many and scattered in the ground tissue with no definite arrangement.
D
Monocot root
S
Pith is large and well developed
Codes:
A
B
C
D
1.
Q
S
P
R
2.
S
Q
R
P
3.
P
R
Q
S
4.
R
P
S
Q
| 1. | Hypodermis | Sclerenchymatous |
| 2. | Endodermis | Starch sheath |
| 3. | Medullary rays | Parenchyma cells |
| 4. | Protoxylem | Endarch |
| 1. | A - Adaxial epidermis | 2. | B - Phloem |
| 3. | C - Mesophyll | 4. | D - Abaxial epidermis |
| 1. | In dicot root, initiation of lateral roots and vascular cambium during the secondary growth takes place in the pericycle |
| 2. | In monocot roots xylem bundles are usually more than six [polyarch] |
| 3. | In dicot stems vascular bundles are arranged in a ring |
| 4. | Monocot stem has a parenchymatous hypodermis |
Lenticels are involved in:
| 1. Gaseous exchange | 2. Food transfer |
| 3. Photosynthesis | 4. Transpiration |
Identify the incorrect comparison between monocots and dicots in general:
| Character | Monocots | Dicots | |
| 1. | Leaves | Parallel venation | Reticulate venation |
| 2. | Roots | Primary root of short duration, replaced by adventitial roots forming fibrous or fleshy root systems | Develops from the radicle. Primary root often persists forming strong tap roots and secondary roots |
| 3. | Plant stem: Vascular bundles | Ring of primary bundles with cambium, differentiated into cortex and stele | Numerous scattered bundles in ground parenchyma, cambium mostly absent, no differentiation between cortical and stelar regions |
| 4. | Flowers | Parts in threes (trimerous) or multiples of three | Fours (tetramerous) or fives (pentamerous) |
Consider the given statements:
I. In dicot roots, the pericycle strengthens the roots and provides protection for the vascular bundles.
II. In dicot root, the vascular cambium is completely secondary in origin, and it originates from a portion of pericycle tissue.
III. The pericycle regulates the formation of lateral roots by rapidly dividing near the xylem elements of the root.
The correct statements are:
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
In the given diagram of a dicot root, the highlighted blue portion:
I. is the endodermis and is included in the stele
II. is the pericycle and is included in the stele
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
The given diagram shows the transverse section of a portion of a:
| 1. | Monocot stem | 2. | Monocot root |
| 3. | Dicot stem | 4. | Dicot root |
Select the correct pair.
1. Cells of medullary rays that form part of a cambial ring - Interfascicular cambium
2. Loose parenchyma cells rupturing the epidermis and forming a lens-shaped opening in the bark - Spongy parenchyma
3. Large colorless empty cells in the epidermis of grass leaves - Subsidiary cells
4. In dicot leaves, vascular bundles are surrounded by large thick-walled cells - Conjunctive tissue
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