The vascular cambium normally gives rise to:

1. Primary Phloem

2. Secondary xylem

3. Periderm

4. Phelloderm

Secondary xylem and phloem in dicot stem are produced by?

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

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