Q. No.The most abundant and common tissue in plants
1.
Has non-vacuolated cytoplasm
2.
Is living and has cellulosic wall
3.
Stores ergastic substances always
4.
Cannot take part in photosynthesis
Secondary meristems are found in
1. All angiosperms
2. Gymnosperms and all monocots
3.Dictos and gymnosperms
4. All spermatophytes
Monocot stems do not have
| 1. | Protophloem |
| 2. | Phloem parenchyma |
| 3. | Companion cell in phloem |
| 4. | Sieve tube and metaphloem |
Choose the correct option with respect to sclereids
| 1. | Physiologically active |
| 2. | Pits are present |
| 3. | Derived from meristems directly |
| 4. | Little amount of protoplasm is present |
Collenchyma is characterised by
| 1. | Absence of protoplast at maturity |
| 2. | Supporting young stem and leaf petiole |
| 3. | Lignocellulosic thickening on secondary walls |
| 4. | The common presence of intracellular spaces |
Epidermal hairs on stems known as trichomes
| 1. | May sometimes be secretory in function |
| 2. | Have vascular supply |
| 3. | May be soft or stiff but unbranched always |
| 4. | Are endogenous in origin like lateral roots |
Select the incorrect statement with respect to bast fibres
| a. | Generally absent in primary phloem |
| b. | Elongated, branched with blunt ends |
| c. | Parenchymatous in nature |
| d. | Becomes dead at maturity |
1. a & d
2. b & d
3. b & c
4. a & b
Sieve tube elements are long, tube-like structures, arranged longitudinally and associated with the companion cells. A mature sieve element
| 1. | Has a small vacuole |
| 2. | Lacks nucleus and cytoplasm |
| 3. | Possesses a large vacuole and small nucleus |
| 4. | Possesses a peripheral cytoplasm |
During the secondary growth in the dicot stem, the cambial ring becomes active and begins to cut off new cells both towards the inner and the outer sides. The cells cut off
1. Towards pith, mature into secondary phloem
2. Towards the periphery, mature into secondary xylem
3. Towards pericycle, mature into secondary xylem as well as secondary phloem
4. Mature into secondary vascular tissues
Match the column I with column II
| Column I | Column II | ||
| a. | Xylem parenchyma | (i) | Absent in most of the monocots |
| b. | Sclereids | (ii) | Lond cylindrical tube-like structure |
| c. | Phloem parenchyma | (iii) | Food and tannins |
| d. | Vessel | (iv) | Fruit walls of nuts |
1. a(i), b(ii), c(iii), d(iv)
2. a(ii), b(iv), c(iii), d(i)
3. a(iii), b(iv), c(i), d(ii)
4. a(iii), b(ii), c(i), d(iv)
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