Cacti Quiz – How Much Do You Really Know?

A saguaro may wait 70 years or more before growing its first arm, and this cacti quiz explores the patience and toughness of these desert icons. Travel from the Sonoran Desert to Mexico, home to the most cactus species, and Brazil, where some cacti grow on rainforest trees.

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🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Americas
Where are almost all cacti native?
Spines
What do cactus spines grow from?
Water
Where do cacti store water?
Arm
About how old is a saguaro when it grows its first arm?
Mexico
Which country has the most cactus species?
Night
Which cactus is famous for flowers that bloom one night?
Food
Which cactus pads and fruits are eaten in Mexico?
Christmas
Where does the Christmas cactus naturally grow?
Dye
Which red dye comes from insects living on prickly pears?
Ribs
Why do many cacti have pleated ribs?

Explanations: answer key for all 10 questions

Q1: Where are almost all cacti native?
Answer: The Americas
One species also grows wild in Africa.
Q2: What do cactus spines grow from?
Answer: Areoles
Areoles are unique to cacti.
Q3: Where do cacti store water?
Answer: In their thick stems
Ribs let the stem expand.
Q4: About how old is a saguaro when it grows its first arm?
Answer: Around 50 to 75 years
Some never grow arms.
Q5: Which country has the most cactus species?
Answer: Mexico
A cactus appears on its flag.
Q6: Which cactus is famous for flowers that bloom one night?
Answer: Queen of the night
Its flowers are large and white.
Q7: Which cactus pads and fruits are eaten in Mexico?
Answer: Prickly pear
The pads are called nopales.
Q8: Where does the Christmas cactus naturally grow?
Answer: On trees in Brazil's forests
It is an epiphytic cactus.
Q9: Which red dye comes from insects living on prickly pears?
Answer: Cochineal
It colors foods and cosmetics.
Q10: Why do many cacti have pleated ribs?
Answer: To expand when storing water
They also create shade.

Cacti Quiz – Spiny Survivors

Cacti are a family of about 1,750 succulent plants native almost entirely to the Americas. They range from tiny button cacti to giant saguaros, and they grow in deserts, mountains and even tropical forests.

Cacti are built to save water. Their thick stems store water, pleated ribs let them expand, and their leaves have become spines that grow from special cushions called areoles. Many open their pores only at night to reduce water loss.

Cacti are important to people and wildlife. Mexico has the greatest number of species, and prickly pear pads and fruit are popular foods. Many cacti are threatened by illegal collecting and land development, so buying nursery-grown plants helps protect wild ones.

What This Quiz Teaches

Plant lovers and students will enjoy these questions.

Where cacti come from
What areoles are
How they store water
Which cacti bloom at night
Why cacti are threatened

Did You Know?

Cactus flowers attract bats and hummingbirds.
Some cacti have no spines.
The cardon is the tallest cactus.
Rhipsalis grows wild in Africa.
Cactus spines can collect fog.