Variation and Selection
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Preview questions (no answers)
- 1.
Which of the following is a cause of variation that occurs specifically during the production of gametes?
A.Independent assortment of chromosomes
B.Growth by mitosis
C.Protein synthesis
D.Binary fission
- 2.
Which of these represents a genotypic variation?
A.A person having the alleles instead of
B.A person having a tan from the sun
C.A person losing a limb in an accident
D.A person learning a second language
- 3.
Which factor causes the variation seen in the color of hydrangea flowers (blue in acidic soil, pink in alkaline soil)?
A.Genetic mutation
B.Soil pH (Environment)
C.Random fertilization
D.Chromosome number
Download the worksheet for Variation and Selection - Variation to practice offline. It includes additional chapter-level practice questions.
Adaptive features
SubtopicAdaptive features under Variation and Selection for Grade 12 IGCSE.
Preview questions (no answers)
- 1.
What is the primary role of the thick, corky bark on some tree species in fire-prone regions?
A.To store extra water for the leaves
B.To protect the living tissues of the trunk from high temperatures
C.To attract wood-boring insects
D.To allow the tree to grow faster after a fire
- 2.
Which adaptation would you expect to see in a plant living in a very windy environment?
A.Very tall, brittle stems
B.Large, delicate flowers
C.Flexible stems and small or divided leaves
D.No roots to anchor the plant
- 3.
Why do some plants produce toxic chemicals in their leaves?
A.To help the plant absorb more nitrogen from the air
B.As an adaptation to deter herbivores from eating them
C.To speed up the rate of respiration in the plant
D.To attract specific types of pollinators
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 12 IGCSE.
Preview questions (no answers)
- 1.
Which of the following can lead to artificial selection being unsuccessful?
A.There is no genetic variation for the desired trait
B.The environment is too stable
C.Too many offspring are produced
D.Natural selection is too slow
- 2.
Which process results in the production of offspring with a mixture of traits from two parents?
A.Binary fission
B.Sexual reproduction
C.Budding
D.Cloning
- 3.
What role does the environment play in natural selection?
A.It causes all mutations to happen
B.It acts as a selection pressure
C.It has no role in the process
D.It allows all individuals to survive equally
Download the worksheet for Variation and Selection - Selection (Natural and Artificial) to practice offline. It includes additional chapter-level practice questions.