Q. No.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 |
During the formation of primary plant body, dermal tissue, ground tissue and vascular tissue are produced by:
1. Primary meristems
2. Secondary meristems
3. Both primary and secondary meristems
4. Neither primary nor secondary meristems
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Regarding the guard cells:
| 1. | walls away from the stomatal pores are thin and those towards the stomatal pores are thick |
| 2. | walls away from the stomatal pores are thick and those towards the stomatal pores are thin |
| 3. | chloroplasts are mostly absent |
| 4. | play no role in the regulation of opening and closing of stomata |
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A simple plant tissue is characterized by:
1. continued cell division
2. presence of only living cells
3. cells with chloroplasts
4. presence of only one type of cells
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All the following statements regarding the anatomy of a typical dicotyledonous root are correct except:
| 1. | Many cells of the epiblema protrude in the form of unicellular root hairs. |
| 2. | The innermost layer of the cortex is called as the endodermis. |
| 3. | Pericycle is made up of collenchymatous cells. |
| 4. | Parenchymatous conjunctive tissue lies between the xylem and phloem. |
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