HORT: Module 5

What is the hormone that is synthetically manufactured that is used in propagation to promote cell differentiation and root growth?

Auxin

In terms of highest amounts of light emission, what is the best material use for covering greenhouses?

Glass

What does the term pot-in-pot in the nursery world?

Growing trees in a container that is set into a slightly larger container that remains in the ground.

Plant breeders make use of sexual propagation to...

Make intentional crosses of parents to produce likely different offspring.

What is the most common used material for covering greenhouses in the US?

Polyethylene (plastic)

The requirement for physical breakdown of the seed coat prior to germination is called...

Scarification

Essentially at North America fruit trees are grafted.

True

In a way, seed dormancy is survival mechanism for plants.

True

Most greenhouse crops grown by commercial growers are high-dollar due to the expense to build and maintain a greenhouse.

True

Soft wood cuttings are taken during the early season of plant growth.

True

The release of carbon dioxide (CO2) in greenhouses has been shown to increase the photosynthetic rate of plants.

True

A liner is nursery jargon for.. (select the best answer)

a small rooted cutting that is sold to another nursery to be grown out to marketable size.

A clone...

is a genetic duplicate.

Grafting a Japanese maple requires a top and bottom component, respectively called the...

scion: rootstock

One benefit of propagating plants from seed is...

you can store a lot of very small plants in a small space.

Most commercial fruit growers purchase trees for planting their orchards that are... (select all that apply)

-Grafted -Bare root -Asexually propagated

Which of the following environmental conditions are best for the early stages of vegetative propagation? (Select ALL that apply)

-High humidity -Warm temperature -Shade

Research and commercial growers who are actively breeding plants will use which of the following practices or production methods? (Check ALL that apply)

-Manual transfer pollen from one plant to another -Isolate crops to control wind pollination -Plant two different cultivars next to each other to intentionally encourage cross pollination -Tissue culture to generate large numbers of clones

Which of the following plant parts can be use to vegetatively propagate plants? (Check ALL that apply)

-Plant cells -Leaves of leaf parts -Stems -Roots

Which of the following are common reasons for grafting apples? (Check ALL that apply)

-Plants that don't root well from cuttings -Soil diseases that affect roots -Height control... mostly apples

Which of the following statements apply to tissue culture of pants? (Check ALL that apply)

-Tissue culture is a form of asexual propagation. -Tissue culture produces a clone of the parent. -Tissue culture must be conducted under very sanitary conditions.

When discussing seed, the term viability means...

-the ability to germinate.

Simply defined, a seed is... (Check ALL that apply)W

-the result of sexual propagation, either natural or assisted by humans -the best (natural) way to get variation in offspring -an undeveloped plant