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
Identify the incorrect match with respect to wood characters given in A, B, C column
A B C
1. | Early Wood | Large no. of xylary elements |
Springwood | wide cavities |
2. | Latewood | Few xylary elements |
Autumn wood | Narrow cavities |
3. | Heartwood | Dark brown in Colour |
Dead elements | Filled with resins and gums |
4. | Sapwood | Light in color | Living elements | Conducts minerals only. |
Select the incorrect statement with respect to late wood
1. It forms a narrow strip in annual rings
2. Has smaller and narrower vessels
3. Darker in colour
4. Fibres are less
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
Cells having cellulose, hemicellulose and pectin deposits on the wall and shows its presence commonly in the petiole of leaf and growing green stems belong to
1. Sclerenchyma
2. Collenchyma
3. Aerenchyma
4. Parencyma