Biology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Characteristics and classification of living organisms
SubtopicCharacteristics and classification of living organisms under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
Classification based on DNA sequencing is more accurate because it reflects:
A.The size of the organism
B.The habitat where the organism lives
C.Evolutionary relationships
D.The diet of the organism
- 2.
A flower with petals in multiples of three is likely to be a:
A.Dicotyledon
B.Fern
C.Monocotyledon
D.Fungus
- 3.
Which group of animals has a backbone?
A.Arthropods
B.Vertebrates
C.Molluscs
D.Annelids
Download the worksheet for Biology - Characteristics and classification of living organisms to practice offline. It includes additional chapter-level practice questions.
Organization of the organism (Cell structure and organization)
SubtopicOrganization of the organism (Cell structure and organization) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
What is the basic functional and structural unit of all living things?
A.An atom
B.A molecule
C.A cell
D.A tissue
- 2.
Which structure is the site of aerobic respiration?
A.Nucleus
B.Ribosome
C.Mitochondrion
D.Chloroplast
- 3.
Why does a root hair cell NOT contain chloroplasts?
A.It is too small
B.It is underground and does not receive light
C.It does not need energy
D.Chloroplasts would stop it from absorbing water
Download the worksheet for Biology - Organization of the organism (Cell structure and organization) to practice offline. It includes additional chapter-level practice questions.
Movement in and out of cells (Diffusion, Osmosis, and Active Transport)
SubtopicMovement in and out of cells (Diffusion, Osmosis, and Active Transport) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
What is required for active transport to occur?
A.A fully permeable membrane
B.Energy and carrier proteins
C.High temperature only
D.A vacuum
- 2.
What happens to the volume of a plant cell when it is placed in a solution with lower water potential?
A.It increases
B.It decreases
C.It stays the same
D.It doubles
- 3.
Which process is being used when a cell absorbs a molecule that is already in higher concentration inside the cell?
A.Diffusion
B.Osmosis
C.Active transport
D.Facilitated diffusion
Download the worksheet for Biology - Movement in and out of cells (Diffusion, Osmosis, and Active Transport) to practice offline. It includes additional chapter-level practice questions.
Biological molecules (Carbohydrates, Lipids, Proteins, and DNA tests)
SubtopicBiological molecules (Carbohydrates, Lipids, Proteins, and DNA tests) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
Which of these is classified as a simple monosaccharide sugar?
A.Starch
B.Glycogen
C.Glucose
D.Cellulose
- 2.
In DNA, the base Cytosine (C) always pairs with which other base?
A.Adenine
B.Guanine
C.Thymine
D.Uracil
- 3.
Which of the following elements must be present for a molecule to be classified as an amino acid?
A.Nitrogen
B.Iron
C.Calcium
D.Potassium
Download the worksheet for Biology - Biological molecules (Carbohydrates, Lipids, Proteins, and DNA tests) to practice offline. It includes additional chapter-level practice questions.
Enzymes (Properties and factors affecting activity)
SubtopicEnzymes (Properties and factors affecting activity) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
If you add a protease to a solution of starch, what will happen?
A.Starch will be broken down into glucose
B.Starch will be broken down into amino acids
C.No reaction will occur because enzymes are specific
D.The protease will turn into amylase
- 2.
Which of these describes the change in an enzyme's rate of reaction as temperature increases toward the optimum?
A.Exponential decrease
B.Steady decrease
C.Steady increase
D.No change
- 3.
What term is used to describe an enzyme that works inside the cell where it was made?
A.Extracellular
B.Intracellular
C.Intercellular
D.Exocellular
Download the worksheet for Biology - Enzymes (Properties and factors affecting activity) to practice offline. It includes additional chapter-level practice questions.
Plant nutrition (Photosynthesis and leaf structure)
SubtopicPlant nutrition (Photosynthesis and leaf structure) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
Which gas must be present in the environment for a plant to produce glucose?
A.Oxygen
B.Carbon dioxide
C.Nitrogen
D.Argon
- 2.
What do we call the continuous movement of water from the roots, through the xylem, and out of the leaves?
A.Transpiration stream
B.Active transport
C.Photosynthesis
D.Digestion
- 3.
Which organic molecule, made from glucose, is used to build the cell walls of plants?
A.Lipids
B.Cellulose
C.Proteins
D.Sucrose
Download the worksheet for Biology - Plant nutrition (Photosynthesis and leaf structure) to practice offline. It includes additional chapter-level practice questions.
Human nutrition (Balanced diet and digestive system)
SubtopicHuman nutrition (Balanced diet and digestive system) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
The chemical digestion of proteins begins in the:
A.Mouth
B.Stomach
C.Large intestine
D.Pancreas
- 2.
Which factor would most likely cause a person to require the highest daily intake of energy?
A.Being an elderly office worker
B.Being a young, active athlete
C.Being a small child
D.Being an adult with a sedentary lifestyle
- 3.
What is the product of the digestion of starch by amylase?
A.Maltose
B.Amino acids
C.Fatty acids
D.Glycerol
Download the worksheet for Biology - Human nutrition (Balanced diet and digestive system) to practice offline. It includes additional chapter-level practice questions.
Transport in plants (Xylem, Phloem, and Transpiration)
SubtopicTransport in plants (Xylem, Phloem, and Transpiration) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
Which of these is a 'sink' during the early spring when a plant begins to grow its first leaves?
A.The storage tubers or roots
B.The new growing buds
C.The soil around the roots
D.The old dead leaves
- 2.
What is the name of the theory that explains how water is pulled up through the xylem?
A.Lock and Key theory
B.Cohesion-tension theory
C.Natural selection
D.Cell theory
- 3.
Which cell type is responsible for the majority of photosynthesis, creating the 'source' of sugars?
A.Xylem vessel cells
B.Palisade mesophyll cells
C.Root hair cells
D.Epidermal cells
Download the worksheet for Biology - Transport in plants (Xylem, Phloem, and Transpiration) to practice offline. It includes additional chapter-level practice questions.
Transport in animals (Heart, Blood vessels, and Blood components)
SubtopicTransport in animals (Heart, Blood vessels, and Blood components) under Biology for Grade 9 IGCSE.
Preview questions (no answers)
- 1.
Which chamber of the heart pumps deoxygenated blood to the lungs?
A.Left atrium
B.Right atrium
C.Left ventricle
D.Right ventricle
- 2.
Which substance is carried from the liver to the kidneys for excretion in the plasma?
A.Glucose
B.Urea
C.Amino acids
D.Bile
- 3.
Which blood vessel has the smallest diameter?
A.Artery
B.Vein
C.Capillary
D.Aorta
Download the worksheet for Biology - Transport in animals (Heart, Blood vessels, and Blood components) to practice offline. It includes additional chapter-level practice questions.