CH Plant Propagation 2

Question 1

Air layering is a propagation method best suited for:

Accepted Answer

Rooting a stem while still attached to the parent plant

Answer

Air layering wounds a stem on the parent plant, packs the wound with moist sphagnum, and wraps it to encourage roots to form before the new plant is severed.

Question 2

Division as a propagation method is most commonly applied to:

Accepted Answer

Clump-forming perennials and ornamental grasses

Answer

Division splits clump-forming perennials and grasses into multiple rooted sections, rejuvenating crowded plants and quickly producing several new plants identical to the parent.

Question 3

In seed propagation, the term 'germination percentage' refers to:

Accepted Answer

The proportion of seeds in a lot that successfully germinate under optimal conditions

Answer

Germination percentage indicates seed lot viability and is used to calculate seeding rates; a lower percentage means more seeds must be sown to achieve the desired plant stand.

Question 4

Which grafting method is commonly used for top-working (reworking) established fruit trees with new scion wood?

Accepted Answer

Cleft grafting

Answer

Cleft grafting is used to graft scion wood onto large-diameter stubs of established trees, making it the standard method for top-working fruit trees to new varieties.

Question 5

A propagation mist system benefits stem cuttings primarily by:

Accepted Answer

Maintaining high humidity to reduce transpiration water loss before roots form

Answer

Intermittent mist keeps cutting foliage wet, reducing stomatal moisture loss and preventing wilting while the cutting is rootless and unable to replace water through uptake.

CH - Certified Horticulturist Practice Test

CH - Certified Horticulturist Practice Test

CH Plant Propagation 2