Characteristics and Classification of Living Organisms
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Characteristics of living organisms
SubtopicCharacteristics of living organisms under Characteristics and Classification of Living Organisms for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which life characteristic involves the removal of substances in excess of requirements, such as salts and water?
A.Respiration
B.Excretion
C.Nutrition
D.Reproduction
- 2.
Which process provides a permanent increase in the dry mass of an organism?
A.Growth
B.Respiration
C.Movement
D.Sensitivity
- 3.
What is the term for a change in the environment that an organism reacts to?
A.Response
B.Stimulus
C.Metabolism
D.Excretion
- 4.
Which of the following describes the chemical reactions in cells that break down nutrient molecules?
A.Photosynthesis
B.Respiration
C.Growth
D.Excretion
- 5.
Which of the following pairs a characteristic with its correct description?
A.Nutrition: the removal of waste products of metabolism
B.Respiration: the breakdown of nutrients to release energy
C.Sensitivity: a permanent increase in size and dry mass
D.Excretion: the process of making more of the same kind of organism
- 6.
If a living organism cannot excrete its metabolic waste, what is the most likely consequence?
A.It will grow faster due to stored materials
B.The waste products will reach toxic levels and may cause death
C.It will switch to an alternative form of nutrition
D.It will stop moving to conserve energy
- 7.
Which life process ensures that an organism can obtain the light or food it needs?
A.Reproduction
B.Sensitivity
C.Excretion
D.Respiration
- 8.
In a biological context, why is a crystal growing in a saturated solution NOT considered to be 'Living'?
A.It does not increase in size over time.
B.It does not have a metabolic system to process energy or nutrients.
C.It cannot be seen without a microscope.
D.It is made of inorganic minerals rather than organic compounds.
- 9.
Which characteristic of life is most directly responsible for an organism's ability to maintain an internal temperature that is different from its surroundings?
A.Movement
B.Sensitivity
C.Nutrition
D.Reproduction
- 10.
Which of the following is a product of 'Excretion' in humans that is NOT a product of 'Respiration'?
A.Carbon dioxide
B.Water vapor
C.Urea
D.Heat energy
Download the worksheet for Characteristics and Classification of Living Organisms - Characteristics of living organisms to practice offline. It includes additional chapter-level practice questions.
Concept and use of a classification system
SubtopicConcept and use of a classification system under Characteristics and Classification of Living Organisms for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
Which of the following is the correct order of the classification hierarchy from largest to smallest group?
A.Kingdom, Class, Phylum, Order, Family, Genus, Species
B.Kingdom, Phylum, Class, Order, Family, Genus, Species
C.Kingdom, Phylum, Order, Class, Family, Genus, Species
D.Species, Genus, Family, Order, Class, Phylum, Kingdom
- 2.
Which body part is found in insects but NOT in arachnids?
A.Jointed legs
B.Exoskeleton
C.Antennae
D.Segmented body
- 3.
What is the most accurate way to determine how closely two species are related?
A.Comparing their body sizes
B.Comparing their habitats
C.Comparing their DNA base sequences
D.Comparing their colors
- 4.
A scientist finds two different birds that look very similar but cannot produce fertile offspring when they mate. What does this tell us?
A.They belong to the same species
B.They belong to different species
C.They belong to different kingdoms
D.They belong to different phyla
- 5.
Which of the following shows the correct way to write the scientific name for a human?
A.Homo Sapiens
B.homo sapiens
C.Homo sapiens
D.homo Sapiens
- 6.
Which of these is a characteristic of all living organisms that is often used in their classification at the cellular level?
A.The presence of a heart
B.The presence of cytoplasm and DNA
C.The ability to fly
D.The ability to breathe through gills
- 7.
A group of similar families is grouped into a/an:
A.Class
B.Order
C.Genus
D.Phylum
- 8.
Why is the classification of organisms considered a dynamic process that changes over time?
A.Organisms are evolving so fast that names must be updated monthly.
B.New evidence from DNA and protein analysis provides better insight into relationships.
C.Biologists often change names to honor new scientists.
D.The binomial system is being replaced by a trinomial system.
- 9.
Which characteristic is used to distinguish mammals from all other vertebrate groups?
A.Possession of a backbone
B.Being endothermic
C.Presence of mammary glands
D.Internal fertilization
- 10.
A biologist finds an organism with the following traits: multicellular, cell walls made of cellulose, and uses light energy to produce glucose. However, it does not produce flowers or seeds. What is it?
A.A fungus
B.A fern
C.A monocotyledon
D.A protoctist
Download the worksheet for Characteristics and Classification of Living Organisms - Concept and use of a classification system to practice offline. It includes additional chapter-level practice questions.
Features of organisms
SubtopicFeatures of organisms under Characteristics and Classification of Living Organisms for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
In classification, a group of organisms that can reproduce to produce fertile offspring is called a:
A.Genus
B.Family
C.Species
D.Class
- 2.
Which group of animals is characterized by having four pairs of legs and no wings?
A.Insects
B.Myriapods
C.Arachnids
D.Crustaceans
- 3.
What is the main difference between the Prokaryote kingdom and the other four kingdoms?
A.Prokaryotes have no cell wall
B.Prokaryotes have no nucleus
C.Prokaryotes are all multicellular
D.Prokaryotes contain chloroplasts
- 4.
Which kingdom consists of organisms that absorb nutrients from dead or decaying organic matter?
A.Animal
B.Plant
C.Fungus
D.Protoctist
- 5.
Which statement about the classification of organisms is correct?
A.Species is a broader category than Genus.
B.Organisms in the same Genus are more closely related than those in the same Family.
C.Kingdom is the most specific level of classification.
D.All organisms in the same Phylum must belong to the same Class.
- 6.
Which feature is found in a typical virus particle?
A.Cytoplasm
B.Cell membrane
C.Protein coat
D.Ribosomes
- 7.
In a dichotomous key, what should each step consist of?
A.Three or more choices
B.Two contrasting statements
C.A description of the organism's habitat
D.The scientific name of the organism
- 8.
Which of the following provides the most definitive evidence that two different-looking populations of birds belong to the same species?
A.They have identical plumage colors.
B.They live in the same geographic region.
C.They can mate and produce offspring that are also capable of breeding.
D.They eat the same types of seeds and insects.
- 9.
Which characteristic is used to classify an organism as an Annelid rather than a Nematode?
A.The presence of a mouth
B.Visible body segmentation
C.The presence of a cuticle
D.A cylindrical body shape
- 10.
Which group of organisms has cells that contain a nucleus, can be either unicellular or multicellular, and may have cell walls made of cellulose or no cell walls at all?
A.Prokaryotes
B.Protoctista
C.Fungi
D.Arthropods
Download the worksheet for Characteristics and Classification of Living Organisms - Features of organisms to practice offline. It includes additional chapter-level practice questions.
Dichotomous keys
SubtopicDichotomous keys under Characteristics and Classification of Living Organisms for Grade 11 IGCSE.
Preview questions (no answers)
- 1.
When you reach the end of a branch in a dichotomous key and see a name in italics, what does that name represent?
A.The habitat
B.The genus and species name
C.The name of the scientist
D.The diet of the organism
- 2.
A key for identifying fish might use which of the following features?
A.Presence of fur
B.Position of the dorsal fin
C.Number of feathers
D.Presence of flowers
- 3.
What is the purpose of the numbers (e.g., 1, 2, 3) at the start of each line in a traditional dichotomous key?
A.To count the organisms
B.To guide the user to the next specific pair of statements
C.To show the difficulty of the question
D.To rank the organisms by size
- 4.
Why is 'Presence of a backbone' a common first step in general animal keys?
A.It is a clear, major anatomical difference.
B.All animals have backbones.
C.It is only found in insects.
D.It is easy to see without a microscope in all animals.
- 5.
What is the final result of successfully following a dichotomous key?
A.A list of all characteristics of the organism
B.The binomial name or identity of the organism
C.A diagram of the organism's internal organs
D.An estimate of the organism's age
- 6.
If you follow a key to identify a shark, which feature would distinguish it from a tuna fish?
A.The presence of gills
B.The presence of fins
C.A skeleton made of cartilage instead of bone
D.The ability to live in water
- 7.
In a dichotomous key, what does the term 'dichotomous' literally mean?
A.Divided into two parts
B.Having many names
C.Scientific classification
D.Organized by size
- 8.
A dichotomous key for identifying types of fruit uses the term 'dehiscent'. What does this mean in a botanical context?
A.The fruit remains closed at maturity.
B.The fruit splits open spontaneously at maturity to release seeds.
C.The fruit is fleshy and eaten by animals.
D.The fruit develops without the process of fertilization.
- 9.
A researcher is using a key to identify species of Drosophila. The key relies on the 'pattern of bristles on the thorax'. If the specimen has been roughly handled and the bristles are broken off, what is the best course of action?
A.Look for the 'sockets' or 'scars' where the bristles were originally attached.
B.Guess the identification based on the color of the eyes.
C.Assume the specimen is a new species with no bristles.
D.Discard the key and use a key for butterflies instead.
- 10.
In a dichotomous key for the identification of shells, the 'direction of coiling' (sinistral vs. dextral) is used. This refers to:
A.The speed at which the mollusk moves.
B.Whether the shell spirals to the left or to the right.
C.The thickness of the calcium carbonate layer.
D.The depth of the water where the shell was found.
Download the worksheet for Characteristics and Classification of Living Organisms - Dichotomous keys to practice offline. It includes additional chapter-level practice questions.