Q. No.Match each item in Column I with one in Column II and choose your answer from the codes given below:
Phloem components
Feature
A. Sieve tube elements
a. Commercial use as in jute, flax and hemp
B. Companion cells
b. Plasmodesmatal connections and storage function
C. Phloem parenchyma
c. Maintaining pressure gradient in sieve tubes
D. Phloem fibers
d. Perforated end walls
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
Phloem components
Feature
A. Sieve tube elements
a. Commercial use as in jute, flax and hemp
B. Companion cells
b. Plasmodesmatal connections and storage function
C. Phloem parenchyma
c. Maintaining pressure gradient in sieve tubes
D. Phloem fibers
d. Perforated end walls
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The meristem which occurs between mature tissues in a plant body is known as:
| 1. Secondary meristem | 2. Intercalary meristem |
| 3. Lateral meristem | 4. Cylindrical meristems |
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Protophloem differs from metaphloem in having:
1. companion cells present
2. dead sieve tube elements
3. narrow sieve tubes
4. lignified phloem fibers
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The incorrect statement regarding epidermal tissue system in angiosperms would be:
| 1. | It comprises of epidermal cells and stomata but not the appendages such as trichomes |
| 2. | It is the outermost layer of the primary plant body forming a continuous layer |
| 3. | It is usually single layered |
| 4. | Cells are parenchymatous with a large vacuole |
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The meristem that helps grasses regenerate parts removed by the grazing herbivores is the:
| 1. | Shoot apical meristem | 2. | Root apical meristem |
| 3. | Intercalary meristem | 4. | Lateral meristem |
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All the following are true for trichomes except:
| 1. | they are usually unicellular |
| 2. | they may be branched |
| 3. | they may be secretory |
| 4. | they help in prevention of water loss due to transpiration |
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Permanent tissues in a plant body are formed following division of cells in:
1. Primary meristems only
2. Secondary meristems only
3. Both primary and secondary meristems
4. Neither primary nor secondary meristems
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In the primary stems and roots, the type of cells usually present in cortex, pith and medullary rays is:
| 1. | Parenchyma | 2. | Collenchyma |
| 3. | Sclerenchyma | 4. | Meristem |
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Mesophyll cells present in the ground tissue of leaves are:
1. chloroplasts lacking thin walled cells
2. chloroplasts containing thick walled cells
3. chloroplasts containing thin walled cells
4. chloroplasts lacking thick walled cells
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Open vascular bundles:
| I: | have cambium present between xylem and phloem |
| II: | possess the ability to form secondary tissues |
| III: | are rare in dicotyledonous stems |
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
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