ESTUDYR
BIOL101 INTRODUCTION TO ECOLOGY CROSSWORD MOST
TESTED QUESTIONS AND ANSWERS GRADED A+ WITH
RATIONALES
BIOL101 Introduction to Ecology – Intensive MCQs
1. The ability of organisms to function within a specific range of temperatures, salinities, or
rainfall amounts is called:
A. Acclimation
B. Tolerance
C. Adaptation
D. Regulation
Rationale: Tolerance refers to the physiological limits within which organisms can
survive. Outside these limits, survival becomes impossible.
2. Animals that obtain energy by eating both plants and animals are called:
A. Herbivores
B. Carnivores
C. Omnivores
D. Detritivores
Rationale: Omnivores feed on both producers (plants) and consumers (animals).
3. Rising sea levels from the greenhouse effect are primarily due to the melting of:
A. Glaciers only
B. Mountain snow caps
C. Polar ice
D. Underground aquifers
Rationale: Melting polar ice contributes significantly to global sea-level rise.
4. All of the living organisms found in a particular area make up a:
A. Population
B. Community
C. Ecosystem
D. Biosphere
Rationale: A community consists of all the populations of different species living in an
area.
5. The process by which an organism adjusts to a change in an abiotic factor is called:
A. Adaptation
, ESTUDYR
B. Regulation
C. Acclimation
D. Mutation
Rationale: Acclimation occurs within an individual’s lifetime as it adjusts physiologically
to environmental changes.
6. A collection of all the organisms in a particular place, together with their nonliving
environment, is known as:
A. Community
B. Population
C. Ecosystem
D. Biosphere
Rationale: Ecosystems include both biotic (living) and abiotic (non-living) factors.
7. Organisms that use energy to control internal body conditions are called:
A. Conformers
B. Specialists
C. Regulators
D. Generalists
Rationale: Regulators expend energy to maintain internal stability despite external
changes.
8. The ultimate source of energy for life on Earth is:
A. Heat from Earth’s core
B. The Sun
C. Chemical bonds
D. The Moon
Rationale: The sun drives photosynthesis and most ecosystems.
9. When cold water sinks near the poles and rises in warmer regions, it produces:
A. Currents
B. Tides
C. Upwelling
D. Jet streams
Rationale: Upwelling recycles nutrients and supports rich marine ecosystems.
10. A species with a broad niche, tolerating many conditions and using varied resources, is
called a:
A. Specialist
B. Regulator
BIOL101 INTRODUCTION TO ECOLOGY CROSSWORD MOST
TESTED QUESTIONS AND ANSWERS GRADED A+ WITH
RATIONALES
BIOL101 Introduction to Ecology – Intensive MCQs
1. The ability of organisms to function within a specific range of temperatures, salinities, or
rainfall amounts is called:
A. Acclimation
B. Tolerance
C. Adaptation
D. Regulation
Rationale: Tolerance refers to the physiological limits within which organisms can
survive. Outside these limits, survival becomes impossible.
2. Animals that obtain energy by eating both plants and animals are called:
A. Herbivores
B. Carnivores
C. Omnivores
D. Detritivores
Rationale: Omnivores feed on both producers (plants) and consumers (animals).
3. Rising sea levels from the greenhouse effect are primarily due to the melting of:
A. Glaciers only
B. Mountain snow caps
C. Polar ice
D. Underground aquifers
Rationale: Melting polar ice contributes significantly to global sea-level rise.
4. All of the living organisms found in a particular area make up a:
A. Population
B. Community
C. Ecosystem
D. Biosphere
Rationale: A community consists of all the populations of different species living in an
area.
5. The process by which an organism adjusts to a change in an abiotic factor is called:
A. Adaptation
, ESTUDYR
B. Regulation
C. Acclimation
D. Mutation
Rationale: Acclimation occurs within an individual’s lifetime as it adjusts physiologically
to environmental changes.
6. A collection of all the organisms in a particular place, together with their nonliving
environment, is known as:
A. Community
B. Population
C. Ecosystem
D. Biosphere
Rationale: Ecosystems include both biotic (living) and abiotic (non-living) factors.
7. Organisms that use energy to control internal body conditions are called:
A. Conformers
B. Specialists
C. Regulators
D. Generalists
Rationale: Regulators expend energy to maintain internal stability despite external
changes.
8. The ultimate source of energy for life on Earth is:
A. Heat from Earth’s core
B. The Sun
C. Chemical bonds
D. The Moon
Rationale: The sun drives photosynthesis and most ecosystems.
9. When cold water sinks near the poles and rises in warmer regions, it produces:
A. Currents
B. Tides
C. Upwelling
D. Jet streams
Rationale: Upwelling recycles nutrients and supports rich marine ecosystems.
10. A species with a broad niche, tolerating many conditions and using varied resources, is
called a:
A. Specialist
B. Regulator
