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Horticulture > Exam 2 > Flashcards

Exam 2 Flashcards

1
Q

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

A

false

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2
Q

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

A

False

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3
Q

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

A

false

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4
Q

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

A

true

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5
Q

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

A

true

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6
Q

Name two cool season horticultural species

A

broccoli and azalea

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7
Q

Name two warm season horticultural species

A

tomato and corn

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8
Q

Name two horticultural crops in which GMO varieties are available

A

Corn and apples

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9
Q

What are the five elements that make up climate?

A

Temp, precipitation, sunlight, humidity, and wind

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10
Q

Auxins

A

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

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11
Q

Softwood

A

Cuttings taken in late spring from new succulent growth.

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12
Q

Cytokins

A

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

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13
Q

scarification

A

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

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14
Q

stratification

A

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

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15
Q

Ethylene

A

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

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16
Q

Parthenocarpy

A

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

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17
Q

Gibberellins

A

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

18
Q

Hypogeal

A

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

19
Q

Senescence

A

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

20
Q

Epigeal

A

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

21
Q

Biennial

A

A plant that requires two seasons to complete its life cycle

22
Q

Monocarp

A

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

23
Q

Semi-hardwood

A

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

24
Q

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

A

scion

25
Q

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

A

layering

26
Q

Which of the following plants can be propagated by dividing rhizomes

A

iris

27
Q

The initial chemical reaction tht begins flowering is called

A

flower induction

28
Q

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

A

phtochrome

29
Q

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

A

hypocotyl

30
Q

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

A

cambium

31
Q

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

A

coleoptile

32
Q

The triphenyltetrazolium test is used to:

A

test viability

33
Q

Plants used as sources for cutting are called :

A

stock plants

34
Q

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

A

Chlorophyll is stacked at the surface of the leaf

35
Q

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

A

4 replications of 100 seeds

36
Q

climate

A

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

37
Q

Microclimate

A

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

38
Q

Abscission

A

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

39
Q

Self-pollination

A

pollen from same plant or genetically identical plant fertilizes ovule

40
Q

Photoperiodism

A

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

41
Q

Three factors that can induce the formation of flowers

A

Self, Photo, and thermal

Horticulture (4 decks)

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