Master Gardener Exam 2026 –Best Practice Questions
with Answers & Rationales Complete Study Guide for
Extension Master Gardener Certification | INSTANT
DOWNLOAD PDF
About the Master Gardener Exam
The Master Gardener program is administered through the Cooperative Extension System,
a nationwide network of land-grant universities established by the Morrill Act of 1862 . The
program provides intensive training in horticulture to volunteers, who then serve their
communities through educational outreach and gardening projects .
Section 1: Botany & Plant Physiology (Questions 1-15)
1. What is the basic structural and functional unit of a plant?
A) Xylem
B) Epidermis
C) Cell
D) Leaf
Answer: C
The cell is the fundamental structural and functional unit of all living organisms, including
plants. Cells are organized into tissues, which form organs like leaves and roots .
2. Which part of a plant is NOT an example of a plant organ?
A) Leaf
B) Stem
C) Flower
D) Xylem
Answer: D
, Plant organs include roots, stems, leaves, and flowers. Xylem is a type of vascular tissue,
not an organ .
3. Which type of plant has herbaceous (non-woody) stems that grow from the ground
up?
A) Red oak
B) Daffodil
C) Japanese maple
D) Pine tree
Answer: B
Daffodils are herbaceous plants that die back to the ground each year. Red oak, Japanese
maple, and pine trees have woody stems .
4. Which plant has a fibrous root system?
A) Carrots
B) Lawn grasses
C) Pine tree
D) Oak tree
Answer: B
Lawn grasses (monocots) have fibrous root systems with many branching roots. Carrots
have taproots; pine and oak trees have woody taproot systems .
5. What is the process by which plants lose water vapor through their leaves called?
A) Photosynthesis
B) Transpiration
C) Respiration
D) Condensation
Answer: B
Transpiration is the loss of water vapor from plant leaves through stomata. It drives water
movement from roots to shoots and cools the plant .
6. Stomata are:
A) Tubes that transport water
B) Openings in the leaf epidermis formed by guard cells
, C) Structures that produce pollen
D) Root hairs that absorb water
Answer: B
Stomata are microscopic openings on leaf surfaces, regulated by guard cells, that control
gas exchange (CO₂ in, O₂ out) and water vapor loss .
7. Which vascular tissue transports water and minerals from roots to the rest of the
plant?
A) Xylem
B) Phloem
C) Cambium
D) Epidermis
Answer: A
Xylem transports water and dissolved minerals upward from the roots through the plant.
Phloem transports sugars (food) from leaves to other plant parts .
8. Which vascular tissue transports food (sugars) throughout the plant?
A) Xylem
B) Phloem
C) Cambium
D) Stomata
Answer: B
Phloem transports the products of photosynthesis (sugars) from leaves to other parts of the
plant where they are needed for growth or storage .
9. Which term refers to plants making their own food?
A) Respiration
B) Photosynthesis
C) Transpiration
D) Fertilization
Answer: B
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to
create oxygen and energy in the form of sugar. This provides food for the plant .
with Answers & Rationales Complete Study Guide for
Extension Master Gardener Certification | INSTANT
DOWNLOAD PDF
About the Master Gardener Exam
The Master Gardener program is administered through the Cooperative Extension System,
a nationwide network of land-grant universities established by the Morrill Act of 1862 . The
program provides intensive training in horticulture to volunteers, who then serve their
communities through educational outreach and gardening projects .
Section 1: Botany & Plant Physiology (Questions 1-15)
1. What is the basic structural and functional unit of a plant?
A) Xylem
B) Epidermis
C) Cell
D) Leaf
Answer: C
The cell is the fundamental structural and functional unit of all living organisms, including
plants. Cells are organized into tissues, which form organs like leaves and roots .
2. Which part of a plant is NOT an example of a plant organ?
A) Leaf
B) Stem
C) Flower
D) Xylem
Answer: D
, Plant organs include roots, stems, leaves, and flowers. Xylem is a type of vascular tissue,
not an organ .
3. Which type of plant has herbaceous (non-woody) stems that grow from the ground
up?
A) Red oak
B) Daffodil
C) Japanese maple
D) Pine tree
Answer: B
Daffodils are herbaceous plants that die back to the ground each year. Red oak, Japanese
maple, and pine trees have woody stems .
4. Which plant has a fibrous root system?
A) Carrots
B) Lawn grasses
C) Pine tree
D) Oak tree
Answer: B
Lawn grasses (monocots) have fibrous root systems with many branching roots. Carrots
have taproots; pine and oak trees have woody taproot systems .
5. What is the process by which plants lose water vapor through their leaves called?
A) Photosynthesis
B) Transpiration
C) Respiration
D) Condensation
Answer: B
Transpiration is the loss of water vapor from plant leaves through stomata. It drives water
movement from roots to shoots and cools the plant .
6. Stomata are:
A) Tubes that transport water
B) Openings in the leaf epidermis formed by guard cells
, C) Structures that produce pollen
D) Root hairs that absorb water
Answer: B
Stomata are microscopic openings on leaf surfaces, regulated by guard cells, that control
gas exchange (CO₂ in, O₂ out) and water vapor loss .
7. Which vascular tissue transports water and minerals from roots to the rest of the
plant?
A) Xylem
B) Phloem
C) Cambium
D) Epidermis
Answer: A
Xylem transports water and dissolved minerals upward from the roots through the plant.
Phloem transports sugars (food) from leaves to other plant parts .
8. Which vascular tissue transports food (sugars) throughout the plant?
A) Xylem
B) Phloem
C) Cambium
D) Stomata
Answer: B
Phloem transports the products of photosynthesis (sugars) from leaves to other parts of the
plant where they are needed for growth or storage .
9. Which term refers to plants making their own food?
A) Respiration
B) Photosynthesis
C) Transpiration
D) Fertilization
Answer: B
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to
create oxygen and energy in the form of sugar. This provides food for the plant .
