Unit 2: Secondary Growth

Question 1

When does secondary growth occur?

Answer 1

In older stems, after primary growth has ended

Question 2

What are the benefits of secondary growth? (6)

Answer 2

*Plant body becomes taller and wider
*Increases the amount of vascular tissue which increases the rate nutrients are conducted throughout the plant
*Increases leaves, which increase the rate of photosynthesis
*Increases amount of roots, which increases the rate of absorption as well as plant stability
*Produces more flowers and increases the rate of reproduction
*Decreases competition from smaller plants

Question 3

Disadvantages of secondary growth

Answer 3

*Environmental changes year to year
*Must obtain an increasing number of resources every year

Question 4

How is wood organized, outside in (5)

Answer 4

Outer bark, inner bark, sapwood, hearwood, pith