Q. No.Which of the following is correct
1. Uneven thickening of cell wall is characteristic of sclerenchyma
2. Periblem forms cortex of stem and root
3. Tracheids are chief water conducting element in gymnosperms
4. Companion cell is devoid of nucleus at maturity
A. 2,3
B. 1,4
C. 1,2
D. 4
The term bark means
A. Phellem, phelloderm and vascular cambium
B. Phellem, Phellogen, phelloderm and secondary phloem
C. Periderm and secondary xylem
D. Cork cambium and cork
Axillary bud and terminal are derived from
A. Lateral meristem
B. Intercalary meristem
C. Apical meristem
D. Parenchyma
Which of the following are true
A. Vessels are multicellular with narrow lumen
B. Tracheids are multicellular with narrow lumen
C. Vessels are unicellular with wider lumen
D. Tracheids are unicellular with narrow lumen
Which of the following is not true about Sclereids?
| 1. | These are parenchyma cells with thick lignified walls |
| 2. | These are are spherical, oval or cylindrical, highly thickened dead cells |
| 3. | These are commonly found in shells of nuts and in pulp of guava, pear, etc. |
| 4. | These are also called stone cells |
Vessels are found in
A. All angiosperms and some gymnosperms
B. Most of angiosperms and few gymnosperms
C. All angiosperms, all gymnosperms and some pteridophyta
D. All pteridophyta
Region of active cell division in plant is called
(1) Axillary
(2) Meristems
(3) Vascular
(4) Myometrium
During the formation of leaves and elongation of stem, some cells left behind from shoot apical meristem constitute _____________
1. Axillary bud
2. Lateral bud
3. Apical bud
4. Protoderm
Axillary buds are capable of forming
(1) Branch or flower
(2) Root and shoot
(3) Apical shoot and fruit
(4) None
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