- 1(current)
Q. No.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 |
The xylem tissue in gymnosperms lacks:
1. Tracheids
2. Vessels
3. Xylem fibers
4. Xylem parenchyma
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Gymnosperms lack:
I. vessels in their xylem
II. sieve tubes and companion cells
III. secondary growth
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II, and III
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In stems:
| 1. | the primary xylem is endarch with protoxylem towards the center and metaxylem towards the periphery |
| 2. | the primary xylem is endarch with metaxylem towards the center and protoxylem towards the periphery |
| 3. | the primary xylem is exarch with protoxylem towards the center and metaxylem towards the periphery |
| 4. | the primary xylem is exarch with metaxylem towards the center and protoxylem towards the periphery |
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Identify the correctly matched pairs:
|
I: |
Sieve cell |
Food conducting element in gymnosperms |
|
II: |
Sieve-tube element |
Food conducting element in angiosperms |
|
III: |
Albuminous cells |
Delivery of substances to sieve-tube element |
|
IV: |
Companion cell |
Delivery of substances to sieve cells |
1. Only I and II
2. Only III and IV
3. Only I and III
4. Only II and IV
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Which of the following statements are correct?
I. Most gymnosperms lack vessels in their xylem
II. Most gymnosperms lack sieve cells and albuminous cells
III. Most monocotyledonous plants lack phloem parenchyma
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
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- 1(current)
Q. No.
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