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Question-1
The kind of place to which a species is biologically adapted to live.
(A)
Optimum
(B)
Niche
(C)
Habitat
(D)
Zone of stress
Question-2
Organisms feeding on other living organisms as a source of energy and nutrients.
(A)
Consumers
(B)
Pests
(C)
Producers
(D)
Decomposers
Question-3
The boundaries between biomes (ecotones) are usually seen as:
(A)
Gradual transition zones.
(B)
Abrupt changes in vegetation, but not of animals
(C)
Abrupt changes in both vegetation and animals
(D)
Distinct topographic barriers such as mountains and rivers
Question-4
On an annual basis, approximately what percentage of all the CO
2
in the atmosphere is fixed by photosynthesis?
(A)
100%
(B)
0%
(C)
36%
(D)
10%
Question-5
The accumulation of herbivore biomass in an ecosystem is an example of:
(A)
Biogeochemical cycles
(B)
Transpiration
(C)
Net primary productivity
(D)
Secondary productivity
Question-6
What type of chemical energy is stored in a plant?
(A)
Kinetic
(B)
Nuclear
(C)
Solar
(D)
Potential
Question-7
The term "detritivore" includes:
(A)
Decomposers
(B)
Primary consumers
(C)
Secondary consumers
(D)
Autotrophs
Question-8
Which role is not performed by bacteria in the nitrogen cycle?
(A)
Fixing nitrogen
(B)
Changing urea to ammonia
(C)
Turning nitrates into nitrogen gas
(D)
Changing nitrates to ammonia
Question-9
The major biotic components of ecosystems include:
(A)
temperature, moisture, sunlight, and pH.
(B)
producers, herbivores, carnivores, and plants
(C)
plants, animals, climate, and microorganisms
(D)
producers, consumers, decomposers, and detritus feeders
Question-10
A food web is:
(A)
Like a food chain
(B)
A set of interconnected species
(C)
A set of interconnected food chains, illustrating the trophic relationships among species
(D)
The trophic (feeding) levels that can be observed in an ecosystem
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Cambridge Secondary Grade 9
IGCSE
Practice in Related Chapters
The Interdependence of Living Organisms
Feeding
Keeping Healthy
Transport in Plants
Classification
Cells and Tissues
Movement in and out of Cells
Personal Health
Animal Nutrition
Reproduction
Sensitivity
Cells the Building Blocks
Genetics
The Skeleton, Muscles and Movement
A Sexual Reproduction and Cloning Plants
The Senses
Survival
Co-ordination
Energy for Respiration
The Chemicals of Living Cells
How Substances Get In and Out of Cells
Plants for Food
Photosynthesis and Nutrition in Plants
Plant Structure and Function
Food and Diet
The Human Impact on the Environment
Digestion, Absorption and Use of Food
The Blood Circulatory System
Breathing
Excretion and the Kidneys
Human Reproduction
Classification
Conservation
Micro Organisms
Reproduction in Flowering Plants
Movement and Locomotion
Growth and Development
Disease: causes, transmission and control
Ecosystems
Population
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