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Question-1
Nitrogen gas accounts for what percentage of the atmosphere?
(A)
0.03%
(B)
1%
(C)
Approximately 50%
(D)
78%
Question-2
The major reservoir for phosphorus.
(A)
Aquifers
(B)
Soil and rocks
(C)
The atmosphere
(D)
The sun
Question-3
What type of organism carries out nitrogen fixation?
(A)
Bacteria
(B)
Fungi
(C)
Protists
(D)
All of the above
Question-4
Which of the following is a secondary consumer?
(A)
A carnivore
(B)
A herbivore
(C)
A plant
(D)
All of the above
Question-5
What type of chemical energy is stored in a plant?
(A)
Kinetic
(B)
Nuclear
(C)
Solar
(D)
Potential
Question-6
The first trophic level refers to:
(A)
all animals
(B)
all herbivores
(C)
sunlight.
(D)
all green plants
Question-7
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-8
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-9
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-10
Approximately what percent of the water absorbed by a plant is lost to the atmosphere?
(A)
1-5%
(B)
10-20%
(C)
25%
(D)
Over 90%
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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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