Smartindia Classroom
CONTENTS
Maths
English
Physics
Chemistry
Biology
History
Geography
Computer
Economics
Back to home
Start Practice
Question-1
The first trophic level refers to:
(A)
all animals
(B)
all herbivores
(C)
sunlight.
(D)
all green plants
Question-2
Nitrogen gas accounts for what percentage of the atmosphere?
(A)
0.03%
(B)
1%
(C)
Approximately 50%
(D)
78%
Question-3
Which macronutrient is important to the operation of stomata?
(A)
Magnesium
(B)
Manganese
(C)
Sulfur
(D)
Potassium
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
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-6
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-7
The process of converting nitrate to nitrogen gas and nitrous oxide is called:
(A)
Nitrogen fixation
(B)
Ammonification
(C)
Denitrification
(D)
Eutrophication
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 study of how organisms interact with each other and their environment.
(A)
Biology
(B)
Ecology
(C)
Environmental science
(D)
Etiology
Question-10
What type of chemical energy is stored in a plant?
(A)
Kinetic
(B)
Nuclear
(C)
Solar
(D)
Potential
Your Score 0/10
Click
here
to see your answersheet and detailed track records.
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
Powered By
