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Questions and Answers
What is a characteristic of cacti that allows them to store water?
Which type of cactus is characterized by round, flat stems with small spines?
What is a function of the spines in cacti?
Which of the following is an adaptation of cacti to conserve water?
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Where are cacti native to?
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What type of soil do cacti often grow in?
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What is one use of cacti?
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What is a unique feature of Mammillaria cacti?
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Study Notes
Characteristics
- Cacti are a type of succulent plant that stores water in their stems
- They have thick, waxy stems that can expand to store water
- Typically have sharp, protective spines instead of leaves
- Spines can be modified leaves or branches that reduce water loss
Types of Cacti
- Opuntia: Prickly pear cacti, characterized by round, flat stems with small spines
- Cereus: Columnar cacti, often growing tall and slender
- Mammillaria: Globular cacti, with short, fine spines and vibrant flowers
- Echinocactus: Barrel cacti, with short, stout stems and prominent ribs
Adaptations
- Deep roots: Allow cacti to access water deep in the soil
- Waxy stems: Prevent water loss through transpiration
- CAM photosynthesis: Open their stomata at night, storing water and reducing water loss
- Drought tolerance: Can survive for extended periods without water
Distribution and Habitat
- Native to the Americas, from British Columbia to southern South America
- Found in dry, sunny areas, such as deserts and dry forests
- Often grow in rocky, well-draining soil
Uses
- Ornamental plants: Grown for their unique shapes and vibrant flowers
- Food source: Some species, like Opuntia, have edible fruits and stems
- Medicinal uses: Some species have been used to treat wounds and reduce inflammation
Characteristics of Cacti
- Cacti are a type of succulent plant that stores water in their stems
- They have thick, waxy stems that can expand to store water
- Typically have sharp, protective spines instead of leaves
- Spines can be modified leaves or branches that reduce water loss
Types of Cacti
- Opuntia: Characterized by round, flat stems with small spines, also known as Prickly pear cacti
- Cereus: Columnar cacti, often growing tall and slender
- Mammillaria: Globular cacti, with short, fine spines and vibrant flowers
- Echinocactus: Barrel cacti, with short, stout stems and prominent ribs
Adaptations of Cacti
- Deep roots allow cacti to access water deep in the soil
- Waxy stems prevent water loss through transpiration
- CAM photosynthesis enables cacti to open their stomata at night, storing water and reducing water loss
- Drought tolerance enables cacti to survive for extended periods without water
Distribution and Habitat of Cacti
- Native to the Americas, from British Columbia to southern South America
- Found in dry, sunny areas, such as deserts and dry forests
- Often grow in rocky, well-draining soil
Uses of Cacti
- Ornamental plants: Grown for their unique shapes and vibrant flowers
- Food source: Some species, like Opuntia, have edible fruits and stems
- Medicinal uses: Some species have been used to treat wounds and reduce inflammation
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Description
Learn about the unique features and types of cacti, including their water-storing stems and protective spines. Discover different types like Opuntia, Cereus, and Mammillaria.
