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

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?