The given diagram shows the transverse section of a portion of a:
1. | Monocot stem | 2. | Monocot root |
3. | Dicot stem | 4. | Dicot root |
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
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 |
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) |
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 |
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 |
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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