Secondary Growth

Question 1

What is secondary growth and how does it work

Answer 1

• Not in monocots – Monocots only 1° growth !! No wood!!
• Vascular cambium layer begins to form.
• Divides off more cells.
• Cells to the inside become secondary xylem (wood) Cells to outside become secondary phloem.
• Adds girth, pushing outer layer farther out.
• Parenchyma in phloem rays fill-in space until cork cambium starts making bark.
• Parenchyma in wood (2°xylem) rays fill-in nonfunctional xylem with resistant compounds making heartwood.

Question 2

secondary xylem

Answer 2

wood

Question 3

Secondary phloem

Answer 3

Produced after initial growth, It develops as a result of secondary growth, responsible for producing new layers of secondary xylem (wood) and then becomes bark

Question 4

periderm

Answer 4

Bark (Periderm) seals out pathogens, water
loss

Question 4

cork

Answer 4

yk what it is

Question 5

vascular cambium

Answer 5

Vascular cambium consists of a layer of actively dividing cells that lies between the primary xylem (towards the center of the stem or root) and the primary phloem (towards the outer part of the stem or root).

Question 6

cork cambium

Answer 6

cork cambium is a critical tissue in woody plants that produces cork cells, forming the protective outer layer of the stem or root

Question 7

xylem rays

Answer 7

They radiate outward from the center of the tree, perpendicular to the growth rings.

Question 8

phloem rays

Answer 8

Phloem rays radiate outward from the center of the stem or root, perpendicular to the growth rings, just like xylem rays in wood.

Question 9

lenticels

Answer 9

are a loose corky layer that still
lets in air for metabolism- but without full
exposure and water loss

Question 10

leaf scar

Answer 10

A leaf scar is a mark or remnant left on a plant’s stem or twig after a leaf has fallen off or been intentionally removed.

Question 11

terminal bud scar

Answer 11

A terminal bud scar, also known as a terminal bud scale scar or simply a bud scale scar, is a distinctive mark or remnant left on a woody plant’s stem or twig after the terminal bud at the tip of a branch has undergone growth or has fallen off.

Question 12

axillary buds

Answer 12

small, dormant buds located in the axils of leaves along the stem

Question 13

nodes

Answer 13

nodes are critical structural points along the stems of plants, where leaves, branches, flowers, and other structures are attached