Exam 2

Question 1

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

Answer 1

false

Question 2

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

Answer 2

False

Question 3

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

Answer 3

false

Question 4

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

Answer 4

true

Question 5

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

Answer 5

true

Question 6

Name two cool season horticultural species

Answer 6

broccoli and azalea

Question 7

Name two warm season horticultural species

Answer 7

tomato and corn

Question 8

Name two horticultural crops in which GMO varieties are available

Answer 8

Corn and apples

Question 9

What are the five elements that make up climate?

Answer 9

Temp, precipitation, sunlight, humidity, and wind

Question 10

Auxins

Answer 10

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

Question 11

Softwood

Answer 11

Cuttings taken in late spring from new succulent growth.

Question 12

Cytokins

Answer 12

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

Question 13

scarification

Answer 13

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

Question 14

stratification

Answer 14

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

Question 15

Ethylene

Answer 15

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

Question 16

Parthenocarpy

Answer 16

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

Question 17

Gibberellins

Answer 17

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

Question 18

Hypogeal

Answer 18

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

Question 19

Senescence

Answer 19

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

Question 20

Epigeal

Answer 20

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

Question 21

Biennial

Answer 21

A plant that requires two seasons to complete its life cycle

Question 22

Monocarp

Answer 22

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

Question 23

Semi-hardwood

Answer 23

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

Question 24

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

Answer 24

scion

Question 25

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

Answer 25

layering

Question 26

Which of the following plants can be propagated by dividing rhizomes

Answer 26

iris

Question 27

The initial chemical reaction tht begins flowering is called

Answer 27

flower induction

Question 28

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

Answer 28

phtochrome

Question 29

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

Answer 29

hypocotyl

Question 30

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

Answer 30

cambium

Question 31

In hypogeal emergence in monocots, the first part of the plant to emerge above the soil surface is the:

Answer 31

coleoptile

Question 32

The triphenyltetrazolium test is used to:

Answer 32

test viability

Question 33

Plants used as sources for cutting are called :

Answer 33

stock plants

Question 34

Which of the following is a way that plants respond to low light:

Answer 34

Chlorophyll is stacked at the surface of the leaf

Question 35

To conduct an official seed germination test, how many seeds should be used?

Answer 35

4 replications of 100 seeds

Question 36

climate

Answer 36

Patterns of meteorological variation that develop over a large area over man yrs. influenced by continental land masses, mountain ranges, oceans, large lakes

Question 37

Microclimate

Answer 37

weather conditions around a plant part, plant, or plants. Influenced by buildings, ponds, depressions in ground, etc.

Question 38

Abscission

Answer 38

The dropping of leaves, flowers, fruits, or other plant parts. Develops where the petiole connects to the stem.

Question 39

Self-pollination

Answer 39

pollen from same plant or genetically identical plant fertilizes ovule

Question 40

Photoperiodism

Answer 40

the effect of the daily dark/light ratio on the growth and flowering of plants.

Question 41

Three factors that can induce the formation of flowers

Answer 41

Self, Photo, and thermal