Secondary xylem and phloem in dicot stem are produced by?
1. | Apical meristems | 2. | Vascular cambium |
3. | Phellogen | 4. | Axillary meristems |
Identify the wrong statement in the context of heartwood:
1. It is highly durable
2. It conducts water and minerals efficiently
3. It comprises dead elements with highly lignified walls
4. Organic compounds are deposited in it
Age of a tree can be estimated by:
1. biomass
2. number of annual rings
3. diameter of its heartwood
4. its height and girth
Interfascicular cambium develops from the cells of:
1. Xylem parenchyma
2. Endodermis
3. Pericycle
4. Medullary rays
Which one of the following is not a lateral meristem?
1. Intrafascicular cambium
2. Interfascicular cambium
3. Phellogen
4. Intercalary meristem
Heartwood differs from sapwood in:
1. presence of rays and fibres
2. absence of vessels and parenchyma
3. having dead and non-conducting elements
4. being susceptible to pests and pathogens
1. phellogen
2. plerome
3. periblem
4. dermatogen
1. shoot apical meristem
2. position of axillary buds
3. size of leaf lamina at the node below each internode
4. intercalary meristem
For a critical study of secondary growth in plants, which one of the following pairs is suitable:
1. Sugarcane and sunflower
2. Teak and pine
3. Deodar and Fern
4. Wheat and maidenhair fern
Which of the statements given below is not true about the formation of Annual Rings in trees?
1. | Annual rings are not prominent in trees of temperate regions. |
2. | Annual rings are a combination of spring wood and autumn wood produced in a year. |
3. | Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively. |
4. | Activity of cambium depends upon variation in climate. |