Multiple Choice
In the context of seagull populations, how can space act as a limiting factor?
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48. Ecology
Introduction to Ecology
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Is it possible for an ecosystem to exist without plants?
A
Yes, ecosystems can exist without plants if other primary producers, such as chemosynthetic bacteria, are present.
B
No, all ecosystems require plants as primary producers.
C
Yes, but only in aquatic environments where animals are the primary producers.
D
No, because plants are the only organisms capable of photosynthesis.
Verified step by step guidance1
Step 1: Begin by understanding the role of primary producers in an ecosystem. Primary producers are organisms that can convert inorganic substances into organic matter, providing energy for other organisms in the food chain. This process is typically achieved through photosynthesis or chemosynthesis.
Step 2: Recognize that plants are not the only primary producers. While plants are the dominant primary producers in terrestrial ecosystems, other organisms, such as algae and chemosynthetic bacteria, can also fulfill this role in aquatic or extreme environments.
Step 3: Explore the concept of chemosynthesis. Chemosynthetic bacteria can produce organic matter by using energy derived from chemical reactions involving inorganic molecules, such as hydrogen sulfide or methane, rather than sunlight. This process supports ecosystems in environments where sunlight is unavailable, such as deep-sea hydrothermal vents.
Step 4: Consider examples of ecosystems without plants. For instance, deep-sea hydrothermal vent ecosystems rely on chemosynthetic bacteria as primary producers, and plants are absent in these environments. This demonstrates that ecosystems can exist without plants if other primary producers are present.
Step 5: Evaluate the options provided in the problem. Based on the information above, the correct answer is: 'Yes, ecosystems can exist without plants if other primary producers, such as chemosynthetic bacteria, are present.' This highlights the diversity of primary producers in different ecosystems.
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