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Question-1
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-2
The kind of place to which a species is biologically adapted to live.
(A)
Optimum
(B)
Niche
(C)
Habitat
(D)
Zone of stress
Question-3
Nitrogen gas accounts for what percentage of the atmosphere?
(A)
0.03%
(B)
1%
(C)
Approximately 50%
(D)
78%
Question-4
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-5
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-6
The term "detritivore" includes:
(A)
Decomposers
(B)
Primary consumers
(C)
Secondary consumers
(D)
Autotrophs
Question-7
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-8
The process of converting nitrate to nitrogen gas and nitrous oxide is called:
(A)
Nitrogen fixation
(B)
Ammonification
(C)
Denitrification
(D)
Eutrophication
Question-9
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%
Question-10
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%
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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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