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Question-1
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-2
The study of how organisms interact with each other and their environment.
(A)
Biology
(B)
Ecology
(C)
Environmental science
(D)
Etiology
Question-3
A biomass pyramid is important because it illustrates:
(A)
The biomass of all organisms at each trophic level in a system
(B)
How energy flows through a food web
(C)
The number of species in each trophic level
(D)
The number of trophic levels in a system
Question-4
Which of the following does not contribute to the species diversity of the tropics?
(A)
Predictability
(B)
Predation
(C)
Species homogeneity
(D)
High productivity
Question-5
Which of the following is a secondary consumer?
(A)
A carnivore
(B)
A herbivore
(C)
A plant
(D)
All of the above
Question-6
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
Question-7
Keystone species:
(A)
Are only found in aquatic habitats
(B)
Are always found at the top of the food chain
(C)
Are usually not the most abundant species in the ecosystem
(D)
Are vital to the soil balance of an entire ecosystem
Question-8
Elements such as calcium, potassium, and phosphorus, needed by the plant in fairly large amounts are called:
(A)
Fertilizers
(B)
Coenzymes
(C)
Macronutrients
(D)
Enzyme activators
Question-9
What type of chemical energy is stored in a plant?
(A)
Kinetic
(B)
Nuclear
(C)
Solar
(D)
Potential
Question-10
Organisms feeding on other living organisms as a source of energy and nutrients.
(A)
Consumers
(B)
Pests
(C)
Producers
(D)
Decomposers
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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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