Exam 2 Flashcards Preview

Horticulture > Exam 2 > Flashcards

Flashcards in Exam 2 Deck (41)
Loading flashcards...
1

T/F: Plants w/aerenchyma in roots are adapted to drought conditions

false

2

T/F: Long day plants flower when the dark period

False

3

U.S. cold hardiness zones are defined by expected avg. winter temps

false

4

As relative humidity increases, the amount of water lost by plants decreases

true

5

Less than 1% of solar radiation reaching the earth is converted into chemical energy by photosynthesis

true

6

Name two cool season horticultural species

broccoli and azalea

7

Name two warm season horticultural species

tomato and corn

8

Name two horticultural crops in which GMO varieties are available

Corn and apples

9

What are the five elements that make up climate?

Temp, precipitation, sunlight, humidity, and wind

10

Auxins

Hormones that cause apical dominance; synthetic versions used to root cuttings

11

Softwood

Cuttings taken in late spring from new succulent growth.

12

Cytokins

Hormones that promote cell division, slow down leaf senescence, and stimulate callus growth in tissue culture.

13

scarification

Breaking dormancy in seeds by breaking the seed coat w/acid or rough (such as using sandpaper) treatment

14

stratification

Breaking dormancy in seeds by storing moist seeds at temps. near freezing for one or more months

15

Ethylene

Hormone that promotes fruit ripening; only type of hormone that is a gas.

16

Parthenocarpy

Th growth of fruit w/o fertilization of the ovule(s) or after fertilized embryos are aborted

17

Gibberellins

Hormones that stimulate cell division and/or cell elongation; involved in flower initiation and fruit growth and ripening.

18

Hypogeal

Emergence in which the cotyledon(s) remain below the soil surface

19

Senescence

The aging and death of a plant or any of its parts.

20

Epigeal

Emergence in which the cotyledon(s) are above the soil.

21

Biennial

A plant that requires two seasons to complete its life cycle

22

Monocarp

A plant that lives for many years but flowers only once and then dies

23

Semi-hardwood

Cuttings taken in summer from partially matured new growth of the season

24

The part of a stem graft that is placed on top is called the:

scion

25

Propagation in which a long hanging branch is brought into contact w/the soil, covered and allowed to root

layering

26

Which of the following plants can be propagated by dividing rhizomes

iris

27

The initial chemical reaction tht begins flowering is called

flower induction

28

the light sensitive protein that is blue in color and controls photoperiodic responses in plants is called:

phtochrome

29

The part of the seedling between the radicle and the cotyledons is called:

hypocotyl

30

When grafting, it is important to line up which part of the two stem pieces?

cambium