Q. No.The nucleus of companion cells controls the functions of:
1. Sieve cells
2. Sieve tubes
3. Albuminous cells
4. Phloem parenchyma
1. Sieve cells
2. Sieve tubes
3. Albuminous cells
4. Phloem parenchyma
In the given diagram of phloem in an angiosperm, the structure not seen in most of the monocots is indicated by the letter:
| 1. A 2. B 3. C 4. D |
 |
Phloem fibers [bast fibers] are:
| 1. | made up of collenchyma and generally not seen in primary phloem |
| 2. | made up of collenchyma and generally not seen in secondary phloem |
| 3. | made up of sclerenchyma and generally not seen in primary phloem |
| 4. | made up of sclerenchyma and generally not seen in secondary phloem |
Which of the following components of the phloem tissue in angiosperms loses protoplasm and becomes dead at maturity?
| 1. Sieve tube elements | 2. Companion cells |
| 3. Phloem parenchyma | 4. Phloem fibers |
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 |
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 |
Protophloem differs from metaphloem in having:
1. companion cells present
2. dead sieve tube elements
3. narrow sieve tubes
4. lignified phloem fibers
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 |
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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