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Question-1
How are the boundaries between biomes (ecotones) 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-2
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-3
In most species, as K+ moves in or out of the guard cell to regulate the stomatal opening, there is movement in the opposite direction by:
(A)
Na+
(B)
H+
(C)
OH-
(D)
Cl-
Question-4
Which of the following chemicals enters living organisms primarily from the atmosphere rather than from rocks or soil?
(A)
Calcium
(B)
Sulfur
(C)
Sodium
(D)
Carbon
Question-5
The accumulation of herbivore biomass in an ecosystem is an example of:
(A)
Bio geochemical cycles
(B)
Transpiration
(C)
Net primary productivity
(D)
Secondary productivity
Question-6
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-7
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-8
What type of organism carries out nitrogen fixation?
(A)
Bacteria
(B)
Fungi
(C)
Protists
(D)
All of the above
Question-9
The term "detritivore" includes:
(A)
Decomposers
(B)
Primary consumers
(C)
Secondary consumers
(D)
Autotrophs
Question-10
The macronutrient, _______________ , is important to the operation of stomata.
(A)
Magnesium
(B)
Manganese
(C)
Sulfur
(D)
Potassium
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Cambridge Secondary Grade 10
IGCSE
Practice in Related Chapters
Feeding
Cells and Tissues
Ecosystems
Population
Transport in Plants
The Chemicals of Living Cells
Sensitivity
Energy For Respiration
How Substances Get In and Out of Cells
Photosynthesis and Nutrition in Plants
Plant Structure and Function
Food and Diet
The Interdependence of Living Organisms
The Human Impact on the Environment
The Blood Circulatory System
Digestion, Absorption and Use of Food
Breathing
Excretion and the Kidneys
Human Reproduction
Reproduction
Classification
Conservation
Micro Organisms
Reproduction in Flowering Plants
Movement and Locomotion
Growth and Development
A Sexual Reproduction and Cloning Plants
The Skeleton, Muscles and Movement
The Senses
Co-ordination
Personal Health
Disease: cause, transmission and control
Genetics
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