crassulacean acid metabolism: meaning, definition, pronunciation and examples
C2+Academic / Technical / Specialized Scientific
Quick answer
What does “crassulacean acid metabolism” mean?
A specific type of photosynthesis adaptation used by some plants in arid conditions, where carbon dioxide is taken in at night and stored as an acid.
Audio
Pronunciation
Definition
Meaning and Definition
A specific type of photosynthesis adaptation used by some plants in arid conditions, where carbon dioxide is taken in at night and stored as an acid.
A physiological adaptation (abbreviated CAM) found in succulents and some other plants, allowing efficient water conservation by separating the temporal processes of gas exchange and carbon fixation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Pronunciation differences lie in stress and vowel qualities.
Connotations
Purely scientific; no cultural connotations.
Frequency
Equally rare and specialized in both varieties, confined to botany, plant physiology, and environmental science contexts.
Grammar
How to Use “crassulacean acid metabolism” in a Sentence
[Plant species] + exhibits/uses/employs + crassulacean acid metabolism.Crassulacean acid metabolism + is found in + [plant family].Vocabulary
Collocations
Examples
Examples of “crassulacean acid metabolism” in a Sentence
verb
British English
- The cacti in the exhibit are metabolising carbon dioxide via crassulacean acid metabolism.
- Some plants can switch to crassulacing under drought stress.
American English
- The agaves in the desert metabolize CO2 through crassulacean acid metabolism.
- The orchid facultatively crassulaceans in the dry season.
adjective
British English
- The crassulacean-acid-metabolism pathway is energy-efficient.
- We studied crassulacean metabolism plants.
American English
- The crassulacean acid metabolism pathway is highly efficient.
- CAM plants have a crassulacean metabolism adaptation.
Usage
Meaning in Context
Business
Virtually never used.
Academic
Core term in plant biology and ecology research papers, textbooks, and lectures.
Everyday
Never used in everyday conversation.
Technical
Essential term in horticulture (especially for succulent growers), agronomy, and climate change research on plant adaptations.
Vocabulary
Synonyms of “crassulacean acid metabolism”
Vocabulary
Antonyms of “crassulacean acid metabolism”
Watch out
Common Mistakes When Using “crassulacean acid metabolism”
- Incorrect stress on 'crassulacean' (often on the third syllable).
- Using it as a countable noun (e.g., 'a crassulacean acid metabolism'). It is uncountable.
- Confusing it with C4 photosynthesis, another adaptation for hot/dry climates.
FAQ
Frequently Asked Questions
It refers to the plant family Crassulaceae (e.g., jade plants, stonecrops), in which this metabolic pathway was first studied intensively, though it is now known to occur in many other families.
No. Both are adaptations for efficient photosynthesis in hot/dry conditions, but they use different anatomical and biochemical mechanisms. CAM separates the processes in time (night vs. day), while C4 separates them in space (different cell types within the leaf).
Yes. Some plants are 'facultative CAM' plants, meaning they can switch to using CAM under drought stress but primarily use the standard C3 pathway when water is plentiful.
The full term 'crassulacean acid metabolism' is long and phonologically complex. The acronym CAM is concise and universally recognized in relevant scientific fields, making communication more efficient.
A specific type of photosynthesis adaptation used by some plants in arid conditions, where carbon dioxide is taken in at night and stored as an acid.
Crassulacean acid metabolism is usually academic / technical / specialized scientific in register.
Crassulacean acid metabolism: in British English it is pronounced /kræs.jʊˌleɪ.ʃən ˈæs.ɪd məˈtæb.əl.ɪ.zəm/, and in American English it is pronounced /ˌkræs.jʊˈleɪ.ʃən ˈæs.ɪd məˈtæb.əˌlɪ.zəm/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think: **Crassula** (a genus of succulent plants) + **-cean** (relating to) + **Acid Metabolism** (it makes and stores acid at night). "CAMels and CAM plants both save water for a dry day."
Conceptual Metaphor
A NIGHT SHIFT / BATTERY SYSTEM: The plant works the 'night shift' to collect CO2 and store it (like charging a battery) for use by the 'day shift' (the normal photosynthetic process).
Practice
Quiz
What is the primary ecological advantage of crassulacean acid metabolism (CAM)?