Leaf Anatomy

Question 1

What is the stomata?

Answer 1

Located mostly under the leaf and regulates water loss in a plant

Question 2

What are the tissues present in a leaf?

Answer 2

Ground, dermal, vascular

Question 3

What is the cuticle?

Answer 3

Wax like covering on the outside of the leaf

Question 4

What is the bundle sheath?

Answer 4

Holds both the xylem and phloem

Question 5

What is mesophyll

Answer 5

Parenchyma cells

Question 6

What is the role of guard cells?

Answer 6

keep toxins out

Question 7

What is the role of the stomata?

Answer 7

Regulate water loss and allow for the movement of CO2 and O2

Question 8

Where are spongy mesophyll located?

Answer 8

Closest to the stomata

Question 9

What percent of the leaf surface is covered with stomata?

Answer 9

1 - 2%

Question 10

Why is there so few stomata on the surface?

Answer 10

Too much water would be lost

Question 11

What percent of water escapes through the stomata?

Answer 11

98%

Question 12

How ma y stomata might be found in 1 cm2

Answer 12

1000 - 1.2 million

Question 13

What is the rest of the leaf covered with besides stomata?

Answer 13

Suberin

Question 14

How is the stomata designed?

Answer 14

Radially oriented cellulose microfibrils

Question 15

What is the role of the vacuole?

Answer 15

Store water

Question 16

When does the guard cell open? When does it close?

Answer 16

Open- cell in turgid state

Closed- cell in flaccid state

Question 17

_________ ions create negative water potential

Answer 17

Potassium

Question 18

What is the source of K+ ions?

Answer 18

Neighboring cells

Question 19

K+ entry into guard cells depends on what?

Answer 19

H+ pump

Question 20

The absorption of K+ causes the water potential to become more _________ and water moves (in or out) of the cell

Answer 20

Negative

In

Question 21

As water enters the cell, the guard cells become __________

Answer 21

Turgid

Question 22

How do you “close” stomata

Answer 22

Turn off proton pump

Question 23

______ allows water to enter the cell into the vacuoles

Answer 23

Potassium

Question 24

What are the stimuli for stomatal opening and closing? 4

Answer 24

1. Stomata opening in the day triggered by light (blue light)
2. CO2 depletion within leaf air spaces (stomata OPEN)
3. Drought stress (stomata CLOSED)
4. Circadian rhythms “internal clocks”