BiologyYear 11 · Module 2Checkpoint Quiz

Checkpoint Quiz 1, Lessons 1–5

Test the content covered so far: multicellular organisation, cell specialisation, tissues, organs, organ systems and review applications.

19 questions15 MC + 4 short answer
Lessons coveredL1 · L2 · L3 · L4 · L5
Suggested time20–25 minutes
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Coverage Check

Section A, Multiple Choice

15 questions · 1 mark each

1. Which statement best defines a colonial organism?

A
A single cell that performs every life function alone.
B
A group of genetically identical cells living together while each cell can still survive independently.
C
A tissue formed by many permanently specialised cells.
D
A single eukaryotic cell containing more than one nucleus.

2. What is the key difference between colonial and multicellular organisms?

A
Colonial organisms are always microscopic, while multicellular organisms are always visible.
B
Multicellular organisms contain membrane-bound organelles, while colonial organisms do not.
C
Cells in multicellular organisms are permanently specialised and usually cannot survive independently.
D
Colonial organisms reproduce only asexually, while multicellular organisms reproduce only sexually.

3. Which feature of Volvox shows an early form of division of labour?

A
All cells in the colony are identical and perform the same role.
B
The colony has no communication between neighbouring cells.
C
Gonidia specialise in reproduction while somatic cells handle movement and photosynthesis.
D
Volvox cells lack chloroplasts, so they rely on other organisms for energy.

4. Cell differentiation occurs because:

A
different cells inherit different DNA sequences during cell division.
B
mutations during development alter the genetic code of each cell type.
C
cells with identical DNA selectively express different subsets of genes in response to chemical signals.
D
cells permanently lose unnecessary genes as they mature.

5. Which structural feature of a red blood cell directly improves gas exchange efficiency?

A
biconcave disc shape, which increases the surface area to volume ratio.
B
a large nucleus containing the genes for haemoglobin synthesis.
C
numerous mitochondria providing ATP for active transport of oxygen.
D
a thick rigid cell wall preventing deformation in capillaries.

6. A cell packed with actin, myosin, and many mitochondria is most likely a:

A
goblet cell.
B
palisade mesophyll cell.
C
root hair cell.
D
muscle cell.

7. Which definition best describes a tissue?

A
a single specialised cell performing a specific function.
B
a group of similar cells with a shared structure working together to perform a specific function.
C
a collection of different cell types performing different functions in one location.
D
any group of cells found in the same organ.

8. Blood is classified as which type of tissue?

A
epithelial tissue, because it lines blood vessels.
B
muscle tissue, because it is pumped by the heart.
C
connective tissue, because cells are dispersed in a liquid extracellular matrix.
D
nervous tissue, because it carries signals around the body.

9. Why are xylem cells dead at maturity?

A
Death removes the cell contents, leaving hollow lignified tubes for water flow and structural support.
B
Dead cells require less energy from the plant, reducing the metabolic cost of transport.
C
Dead cells cannot be detected by pathogens, protecting the transport system from disease.
D
Dead cells have thinner walls, allowing water to pass through more easily.

10. Which statement correctly distinguishes an organ from a tissue?

A
An organ is always larger than a tissue.
B
A tissue contains specialised cells, whereas an organ does not.
C
An organ is composed of two or more tissue types working together, whereas a tissue consists of similar cells performing a shared function.
D
An organ is found only in animals, whereas tissues are found in both animals and plants.

11. The ability of the heart to pump blood is best described as:

A
a property of cardiac muscle cells that is lost when cells form tissue.
B
an emergent property arising from integration of multiple tissue types at the organ level.
C
a property suppressed until the organ is fully formed.
D
a property that arises only at the organ system level.

12. Which structure is correctly classified as an organ?

A
The stomach, because it contains multiple tissue types working together.
B
A tendon, because it is a large specialised structure.
C
Cardiac muscle, because it consists of specialised contractile cells.
D
The digestive system, because it performs complete digestion.

13. What is the critical distinction between colonial and multicellular organisms?

A
Colonial organisms contain more cells.
B
In multicellular organisms, cells are permanently specialised and cannot survive independently, whereas colonial cells can.
C
Colonial organisms are prokaryotic while multicellular organisms are eukaryotic.
D
Multicellular organisms reproduce sexually while colonial organisms do not.

14. A cell with no nucleus, no mitochondria, a biconcave shape, and a red iron-containing protein is most likely a:

A
goblet cell
B
palisade mesophyll cell
C
stem cell
D
red blood cell

15. Which tissue type is correctly matched to a key structural feature?

A
Epithelial tissue, tightly packed cells forming a continuous sheet on a basement membrane.
B
Connective tissue, cells arranged in parallel layers with no extracellular matrix.
C
Nervous tissue, cells packed tightly with striations from actin and myosin.
D
Muscle tissue, cells dispersed widely in a fluid, gel, or solid matrix.

Section B, Short Answer

4 questions · structure-function focus

16. Explain why surface area to volume ratio creates a size limit for single-celled organisms. 3 MARKS

17. Compare colonial organisms and true multicellular organisms. 4 MARKS

18. Choose one specialised cell and explain how its structure suits its function. 4 MARKS

19. Explain the hierarchy from cells to organism using one example. 4 MARKS

Answers, Section A

▼

1. BColonial organisms are groups of similar cells living together, but unlike true multicellular organisms their cells are not permanently interdependent.

2. CPermanent specialisation and interdependence mark the jump from colonial organisation to true multicellularity.

3. CVolvox is important because some cells are already taking on different jobs, even though the colony has not reached full multicellularity.

4. CDifferentiation is driven by selective gene expression, not different DNA content.

5. AThe biconcave shape increases membrane surface for diffusion while keeping the diffusion path short.

6. DActin and myosin are contractile proteins, and a high mitochondrial count supports the ATP demand of contraction.

7. BTissues are made of similar cells organised for a shared function.

8. CBlood fits connective tissue because its cells are suspended in plasma, an extracellular matrix.

9. AThe structure works precisely because the living contents are gone and the lignified tube remains.

10. CThe key structural distinction is integration of multiple tissue types at the organ level.

11. BThe pumping function emerges when multiple tissues are integrated into the heart as an organ.

12. AThe stomach is an organ because it integrates epithelial, connective, muscle, and nervous tissue.

13. BPermanent interdependence is the defining distinction.

14. DEach feature points to a red blood cell specialised for oxygen transport.

15. AThe other answers swap structural features between tissue types.

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