Master Gardener Certification Actual Exam 2026-2028
Update – 200 Questions Practice Test with Answers &
Rationales | PDF
1. What is the primary function of chlorophyll in plants?
A) Absorb water
B) Store nutrients
C) Capture light energy for photosynthesis
D) Transport sugars
Rationale: 👀*** Chlorophyll absorbs sunlight to convert CO₂ and H₂O into
glucose and oxygen.
2. Which soil texture has the highest water-holding capacity?
A) Sand
B) Silt
C) Clay
D) Loam
Rationale: 👀*** Clay particles are very small, giving high surface area and
water retention, though poor drainage.
3. Which plant hormone is primarily responsible for stem elongation?
A) Abscisic acid
B) Ethylene
C) Gibberellin
D) Cytokinin
,Rationale: 👀*** Gibberellins promote cell elongation, breaking seed
dormancy, and flowering.
4. What is the best method to control aphids in a vegetable garden?
A) Introduce ladybugs
B) Apply nitrogen fertilizer
C) Mulch heavily
D) Reduce watering
Rationale: 👀*** Ladybugs are natural predators of aphids, an effective
biological control.
5. Which soil pH range is ideal for most garden vegetables?
A) 4.5–5.0
B) 5.0–5.5
C) 6.0–7.0
D) 7.5–8.0
Rationale: 👀*** Slightly acidic to neutral soils allow optimal nutrient availability
for most vegetables.
6. Which of the following is a nitrogen-fixing plant?
A) Tomato
B) Soybean
C) Corn
D) Lettuce
,Rationale: 👀*** Legumes form symbiotic relationships with Rhizobium
bacteria to fix atmospheric nitrogen.
7. What is the main cause of blossom-end rot in tomatoes?
A) Fungal infection
B) Insect damage
C) Calcium deficiency
D) Excess nitrogen
Rationale: 👀*** Lack of calcium during fruit development causes necrotic
tissue at blossom end.
8. Which irrigation method is most water-efficient for vegetable beds?
A) Overhead sprinklers
B) Flood irrigation
C) Drip irrigation
D) Furrow irrigation
Rationale: 👀*** Drip irrigation delivers water directly to the root zone, reducing
evaporation and runoff.
9. What is the process by which plants lose water through leaves?
A) Translocation
B) Transpiration
C) Photosynthesis
D) Respiration
, Rationale: 👀*** Water vapor exits stomata, helping nutrient transport and
cooling plants.
10. Which of the following is a warm-season crop?
A) Broccoli
B) Tomato
C) Spinach
D) Peas
Rationale: 👀*** Warm-season crops require higher temperatures for
germination and growth.
11. Which practice helps reduce soil erosion in a sloped garden?
A) Removing mulch
B) Planting in straight rows
C) Contour planting
D) Compacting the soil
Rationale: 👀*** Planting along slope contours slows water runoff and reduces
erosion.
12. What is the function of xylem tissue in plants?
A) Transport sugars
B) Store nutrients
C) Transport water and minerals
D) Produce flowers
Rationale: 👀*** Xylem conducts water from roots to shoots.
Update – 200 Questions Practice Test with Answers &
Rationales | PDF
1. What is the primary function of chlorophyll in plants?
A) Absorb water
B) Store nutrients
C) Capture light energy for photosynthesis
D) Transport sugars
Rationale: 👀*** Chlorophyll absorbs sunlight to convert CO₂ and H₂O into
glucose and oxygen.
2. Which soil texture has the highest water-holding capacity?
A) Sand
B) Silt
C) Clay
D) Loam
Rationale: 👀*** Clay particles are very small, giving high surface area and
water retention, though poor drainage.
3. Which plant hormone is primarily responsible for stem elongation?
A) Abscisic acid
B) Ethylene
C) Gibberellin
D) Cytokinin
,Rationale: 👀*** Gibberellins promote cell elongation, breaking seed
dormancy, and flowering.
4. What is the best method to control aphids in a vegetable garden?
A) Introduce ladybugs
B) Apply nitrogen fertilizer
C) Mulch heavily
D) Reduce watering
Rationale: 👀*** Ladybugs are natural predators of aphids, an effective
biological control.
5. Which soil pH range is ideal for most garden vegetables?
A) 4.5–5.0
B) 5.0–5.5
C) 6.0–7.0
D) 7.5–8.0
Rationale: 👀*** Slightly acidic to neutral soils allow optimal nutrient availability
for most vegetables.
6. Which of the following is a nitrogen-fixing plant?
A) Tomato
B) Soybean
C) Corn
D) Lettuce
,Rationale: 👀*** Legumes form symbiotic relationships with Rhizobium
bacteria to fix atmospheric nitrogen.
7. What is the main cause of blossom-end rot in tomatoes?
A) Fungal infection
B) Insect damage
C) Calcium deficiency
D) Excess nitrogen
Rationale: 👀*** Lack of calcium during fruit development causes necrotic
tissue at blossom end.
8. Which irrigation method is most water-efficient for vegetable beds?
A) Overhead sprinklers
B) Flood irrigation
C) Drip irrigation
D) Furrow irrigation
Rationale: 👀*** Drip irrigation delivers water directly to the root zone, reducing
evaporation and runoff.
9. What is the process by which plants lose water through leaves?
A) Translocation
B) Transpiration
C) Photosynthesis
D) Respiration
, Rationale: 👀*** Water vapor exits stomata, helping nutrient transport and
cooling plants.
10. Which of the following is a warm-season crop?
A) Broccoli
B) Tomato
C) Spinach
D) Peas
Rationale: 👀*** Warm-season crops require higher temperatures for
germination and growth.
11. Which practice helps reduce soil erosion in a sloped garden?
A) Removing mulch
B) Planting in straight rows
C) Contour planting
D) Compacting the soil
Rationale: 👀*** Planting along slope contours slows water runoff and reduces
erosion.
12. What is the function of xylem tissue in plants?
A) Transport sugars
B) Store nutrients
C) Transport water and minerals
D) Produce flowers
Rationale: 👀*** Xylem conducts water from roots to shoots.
