Q. No.Tissue which provides mechanical strength and flexibility to young dicot stem is present in
1.
Pith
2.
Endodermis
3.
Hypodermis
4.
Cortex
The ground tissue system is constituted by all off these, except
| 1. | Medullary rays | 2. | Pericycle |
| 3. | Mesophyll | 4. | Xylem |
Conjoint, collateral, closed vascular bundles without phloem parenchyma are found in plants which have
| 1. | Differentiated ground tissue in the stem |
| 2. | Dedifferentiated pericyclic structure in the mature root |
| 3. | Sclerenchymatous hypodermis in stem |
| 4. | Developed pith in stem |
The tissue belonging to bark but not to periderm is
1. Vascular cambium
2. Secondary phloem
3. Phellem
4. Secondary cortex
Which of the following is correct with respect to lenticels?
| a. | Phellogen forms parenchymatous cells on the outer side |
| b. | It is a lens-shaped opening |
| c. | Helps in exchange of gases |
| d. | Present mostly in woody trees |
1. a & b correct
2. c & d correct
3. b, c, & d correct
4. All are correct
In a leaf, oval cells with large intercellular spaces and radially arranged columnar cells without intercellular spaces are placed respectively towards
| 1. | Adaxial and abaxial epidermis |
| 2. | Abaxial and adaxial epidermis |
| 3. | Abaxial and abaxial epidermis |
| 4. | Lower and abaxial epidermis |
Which of the following is not the component of secondary phloem?
| 1. | Protophloem | 2. | Bast fibers |
| 3. | Companion cells | 4. | Phloem parenchyma |
Monocot root differs from dicot root in
| 1. | Having differentiated ground tissue |
| 2. | Presence of centripetal xylem |
| 3. | Pericyclic origin of lateral roots |
| 4. | Presence of large and well-developed pith |
Protoxylem lies towards periphery and metaxylem lies towards the centre. Such arrangement of ______ xylem is present in ________.
1. Secondary, root
2. Primary, stem
3. Secondary, stem
4. Primary, root
Lenticels are present in
1. Outer primary protective tissue
2. The outer layer of secondary protective tissue
3. The middle layer of secondary protective tissue
4. Inner layer of secondary protective tissue
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