SB2c Plant growth

Question 1

Describe features of palisade cells (3)

Answer 1

.contain many chloroplasts for photosynthesis
.large vacuole contains cell sap for rigidity
.strong wall for support

Question 2

Describe feature of xylem cells (3)

Answer 2

.thick walls of lignin for support
.pores that allow water and minerals through
.lack cells wall to allow water to flow easily

Question 3

Describe features of phloem cells (3)

Answer 3

.holes allow liquids to flow from cell to cell
.companion cells contain mitochondria to pump sucrose around
.no nucleus allows more space for movement

Question 4

Describe features of root hair cells (3)

Answer 4

.large surface area for diffusion
.thin membrane for diffusion
.mitochondria for active transport of minerals

Question 5

State 4 features of a root tip.

Answer 5

.root cap
.meristem
.zone of elongation
.zone of differentiation

Question 6

Root cap?

Answer 6

tough layer of cells that protect the tip as the root grows through the soil.

Question 7

Meristem?

Answer 7

just behind the root cap, where cell division occurs via mitosis.

Question 8

Zone of elongation?

Answer 8

where cells increase in length before the cell walls hardens.

Question 9

Zone of differentiation?

Answer 9

where differentiation in cells becomes obvious (e.g. producing root hair cells and young xylem tubes).

Question 10

How can plant growth be calculated?

Answer 10

by using height, leaf surface area, and mass.

Question 11

How can percentage changes be calculated?

Answer 11

final value-starting value/starting value x 100