Free Certified Arborist Identification and Selection Questions and Answers — Questions and Answers
Question 1: What is the term for a group within a species that naturally breeds to a feature that sets them apart from other members of the species?
- Variety (Correct answer)
- Subspecies
- Formal
- Cultivar
Correct answer: Variety
A variety (often denoted by 'var.' in botanical names) is a naturally occurring subdivision within a species that possesses distinct characteristics. These traits are stable and heritable, allowing the group to breed true from seed. Unlike cultivars, varieties arise naturally in the wild without human intervention.
Question 2: What factor determines a tree's value most in the CTLA trunk formula method?
- Foliage
- Size (Correct answer)
- Health
- Location
Correct answer: Size
In the CTLA (Council of Tree and Landscape Appraisers) trunk formula method, the tree's size, specifically its trunk diameter, is the most significant factor in establishing its base value. This base value is then adjusted by other factors like species, condition, and location. A larger, more mature tree generally has a higher initial monetary value.
Question 3: What is the name of a variety that requires human care and cultivation to maintain a specific trait?
- Cultivar (Correct answer)
- Subspecies
Correct answer: Cultivar
A cultivar (short for 'cultivated variety,' often denoted by 'cv.' or single quotes) is a plant group within a species that has been selected and maintained by humans for specific desirable traits. These traits are not typically found in wild populations and require human intervention, such as propagation through cuttings or grafting, to preserve them. Cultivars do not breed true from seed.
Question 4: Maple, ash, dogwood, and horse chestnut trees primarily exhibit what type of leaf arrangement?
- Opposite (Correct answer)
- Undulate
- Alternate
- Whorled
Correct answer: Opposite
Maple, ash, dogwood, and horse chestnut trees are classic examples of trees that exhibit an opposite leaf arrangement. This means that two leaves emerge from the stem directly across from each other at each node. This characteristic is a crucial identification feature for these and other tree species.
Question 5: Which color do the majority of newly planted roots have?
- Brown
- Black
- White (Correct answer)
- Red
Correct answer: White
The majority of newly planted, healthy, and actively growing roots are typically white or light-colored. This indicates that they are young, succulent, and efficiently absorbing water and nutrients. Brown or black roots often suggest damage, disease, or decay.
Question 6: The classification terms are listed in which order, from general to specific?
- Class, order, family, genus (Correct answer)
- Genus, family, order, class
- Family, class, order, genus
- Order, class, phylum, kingdom
Correct answer: Class, order, family, genus
The standard taxonomic classification system, from general to specific, follows the order: Kingdom, Phylum, Class, Order, Family, Genus, Species. Therefore, among the given options, Class, Order, Family, Genus represents the correct sequence from broader to more specific groupings. This hierarchy helps scientists organize and understand the relationships between different organisms.
Question 7: A tree's hardiness refers to its ability to tolerate extremely _______ temperatures.
- variable
- hot or cold (Correct answer)
- temperate
- moderate
Correct answer: hot or cold
A tree's hardiness refers to its ability to tolerate extreme environmental conditions, particularly temperature. This includes both extremely hot and extremely cold temperatures, as well as sudden fluctuations. Hardiness zones are established to help gardeners and arborists select plants that can survive the minimum winter temperatures in a specific region.
Question 8: Which of these describes a hybrid?
- Cornus florida f. rubra
- Gleditsia triacanthos var. inermis
- Nepenthes x hookeriana (Correct answer)
- Acer saccharum
Correct answer: Nepenthes x hookeriana
A hybrid plant is the result of cross-pollination between two different species, genera, or even families. In botanical nomenclature, a hybrid is typically indicated by an 'x' placed between the genus name and the specific epithet, or before the specific epithet if the parentage is within the same genus. Therefore, 'Nepenthes x hookeriana' correctly denotes a hybrid.
Question 9: What term is used to classify a nonindigenous species that will propagate without assistance and has become established in a particular area?
- Invasive
- Introduced
- Native
- Naturalized (Correct answer)
Correct answer: Naturalized
A naturalized species is a nonindigenous (introduced) plant that has successfully established itself in a new environment and can reproduce and spread without human assistance. Unlike invasive species, naturalized plants do not necessarily cause significant ecological or economic harm. They have simply adapted to their new surroundings and become part of the local flora.
Question 10: What is the term used to describe a broad planting of the same species over a wide area?
- Permaculture
- Pathogen
- Monoculture (Correct answer)
- Monocot
Correct answer: Monoculture
Monoculture is the agricultural practice of growing a single crop or plant species over a large area. While it can be efficient for production, it often leads to reduced biodiversity and increased susceptibility to pests and diseases, as a single pathogen can rapidly spread through the genetically uniform population.
Question 11: What's the difference between vigor and vitality in terms of plant care?
- Vitality is a plant's capacity to flourish in a specific environment, whereas vigor is a plant's innate ability to withstand stress. (Correct answer)
- Vitality is a state that is naturally occurring, whereas vigor requires adequate care.
- Vitality is mainly concerned with survival, whereas vigor is linked to abnormally great development.
- The difference between vigor and vitality is nonexistent.
Correct answer: Vitality is a plant's capacity to flourish in a specific environment, whereas vigor is a plant's innate ability to withstand stress.
In plant care, vitality refers to a plant's overall health and its capacity to thrive and flourish in a specific environment, encompassing its ability to grow, reproduce, and resist stress. Vigor, on the other hand, describes a plant's innate ability to withstand environmental stresses and its capacity for robust growth. A vigorous plant may not always be vital if its environment is unsuitable.
Free Certified Arborist Identification and Selection Questions and Answers
What is the term for a group within a species that naturally breeds to a feature that sets them apart from other members of the species?