The springwood present in an annual ring
1. Is dark colored
2. Has high density than autumn wood
3. Has abundant fibers
4. Has low density than autumn wood
Dicot roots do not have cambium in vascular bundles, but secondary growth cambium is served from
1. Pericycle cells only
2. Pericycle and conjunctive tissue
3. Conjunctive tissue only
4. Pericycle and cortex
Which of the following is secondary in origin?
1. Phellogen
2. Interfascicular cambium
3. Wound meristem
4. More than one option is correct
Identify the incorrect match with respect to wood characters given in A, B, C column
A B C
1. | Early Wood | Large no. of xylary elements |
Springwood | wide cavities |
2. | Latewood | Few xylary elements |
Autumn wood | Narrow cavities |
3. | Heartwood | Dark brown in Colour |
Dead elements | Filled with resins and gums |
4. | Sapwood | Light in color | Living elements | Conducts minerals only. |
Select the incorrect statement with respect to late wood
1. It forms a narrow strip in annual rings
2. Has smaller and narrower vessels
3. Darker in colour
4. Fibres are less
Secondary meristems are found in
1. All angiosperms
2. Gymnosperms and all monocots
3.Dictos and gymnosperms
4. All spermatophytes
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
a. | Annual rings are bands of secondary phloem and medullary rays. |
b. | The wood of Cycas has vessels. |
c. | Conjoint vascular bundles are found in the leaves of sunflowers and maize. |
Which of the above statement(s) is/are correct?
1. a & b are correct
2. b & c are correct
3. Only a is correct
4. Only c is correct
Select the odd one out with respect to tissues
1. A group of cells having a common origin
2. They usually perform a common function
3. Complex tissues are made of more than one type of cells
4. They are not capable of division
During secondary growth in dicot root
1. Vascular cambium arises completely from conjunctive parenchyma
2. Growth rings are distinct with spring wood alternating with autumn wood
3. Phellogen arises from the epidermis
4. Vascular cambium is complete and continuous wavy ring