Q. No.Secondary xylem and secondary phloem in dicot stem are produced by
1. Apical meristems
2. Axillary meristems
3. Phellogen
4. Vascular cambium
1. Apical meristems
2. Axillary meristems
3. Phellogen
4. Vascular cambium
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Plants having little or no secondary growth are
| 1. | Grasses | 2. | Cycads |
| 3. | Conifers | 4. | Deciduous angiosperms |
Cuticle:
1. is a covering, both outside and inside of the epidermis
2. is well developed in roots
3. helps in prevention of water loss
4. is a proteinaceous layer
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In a dicot stem, the pericycle is present on the inner side of the endodermis and:
| 1. | above the phloem, in form of semi-lunar patches of sclerenchyma |
| 2. | above the xylem, in form of semi-lunar patches of sclerenchyma |
| 3. | above the phloem, in form of semi-lunar patches of collenchyma |
| 4. | above the xylem, in form of semi-lunar patches of collenchyma |
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In a dicot root, initiation of lateral roots and vascular cambium during the secondary growth takes place in the cells of:
| 1. | Outer cortex | 2. | Inner cortex |
| 3. | Endodermis | 4. | Pericycle |
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In a dicot stem the term 'starch sheath' is used for:
| 1. | Epidermis with guard cells | 2. | Hypodermis |
| 3. | Endodermis | 4. | Pericycle |
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Match each item in Column I with one in Column II and choose your answer from the codes given below:
|
COLUMN I |
COLUMN II |
|
A. Parenchyma |
a. Mechanical support to young stem and petiole |
|
B. Collenchyma |
b. Thin cellulosic cell walls |
|
C. Sclerenchyma fibers |
c. Thickened dead cells with very narrow cavities |
|
D. Sclereids |
d. Thick walled, elongated and pointed cells |
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | d | c |
| 3. | b | d | c | a |
| 4. | d | c | b | a |
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Plant tissues are classified into two main groups, meristematic and permanent, mainly on the basis of:
1. their location
2. time of their origin during the plant life
3. capability of division
4. degree of differentiation
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In the given diagram, the root apical meristem is represented by the letter:
|
1. A |
 |
Match xylem elements in Column I with their feature in Column II and choose answer from the codes given below:
|
COLUMN I |
COLUMN II |
|
A. Tracheids |
a. Living with cellulosic cell wall |
|
B. Vessels |
b. Highly thickened walls and obliterated central lumens |
|
C. Xylem fibers |
c. Long cylindrical tube-like structures, lignified walls and a large central cavity |
|
D. Xylem parenchyma |
d. Elongated tube-like cells, lignified walls and tapering ends |
Codes
| A | B | C | D | |
| 1. | a | b | c | d |
| 2. | b | a | d | c |
| 3. | b | d | c | a |
| 4. | d | c | b | a |
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