Variation and Selection
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Variation and mutation
SubtopicVariation and mutation under Variation and Selection for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which environmental factor is most likely to increase the rate of genetic mutation in organisms?
A.Low light intensity
B.Exposure to ionising radiation
C.Increased atmospheric oxygen
D.Regular physical activity
- 2.
A sudden change in the base sequence of DNA or in the structure of a chromosome is known as a:
A.Mutation
B.Fertilization
C.Translation
D.Selection
- 3.
Which of the following is an example of discontinuous variation in humans?
A.Body mass
B.Height
C.ABO blood group
D.Foot length
Download the worksheet for Variation and Selection - Variation and mutation to practice offline. It includes additional chapter-level practice questions.
Adaptive features
SubtopicAdaptive features under Variation and Selection for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which feature is an adaptation specifically for a nocturnal predator to locate its prey in the dark?
A.Large ears with a high sensitivity to low-frequency sounds
B.A digestive system capable of breaking down cellulose
C.Brightly colored markings to warn other predators
D.Slow metabolic rate to conserve energy during the day
- 2.
Xerophytes are plants adapted to survive in environments with limited water. Which feature would you expect to find in a xerophyte?
A.Very thin cell walls in the root cortex
B.A large total surface area of leaves
C.Sunken stomata to trap moist air
D.Absence of a waxy cuticle on the leaf surface
- 3.
The diagram shows a cross-section of a leaf from a plant living in a specific environment. Based on the labels, what is this plant's adaptation?
A.Stomata on the bottom to prevent water loss
B.Lack of a waxy cuticle to absorb more water
C.Roots that grow upwards to breathe air
D.Large air spaces to provide buoyancy and allow gas exchange
Download the worksheet for Variation and Selection - Adaptive features to practice offline. It includes additional chapter-level practice questions.
Selection (Natural and Artificial)
SubtopicSelection (Natural and Artificial) under Variation and Selection for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
In the context of evolution, which process occurs when humans choose individual plants or animals with desirable traits for reproduction?
A.Natural selection
B.Genetic engineering
C.Speciation
D.Artificial selection
- 2.
Which of the following is an example of continuous variation in a human population?
A.ABO blood groups
B.The ability to roll the tongue
C.Body mass
D.Biological sex
- 3.
Selective breeding is another term used to describe which process?
A.Natural selection
B.Artificial selection
C.Discontinuous variation
D.Evolutionary adaptation
Download the worksheet for Variation and Selection - Selection (Natural and Artificial) to practice offline. It includes additional chapter-level practice questions.