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Chapter 6 Practice Paper: Model of Cells — mark scheme

QuizQuipPractice Series
QQ/S1SCI/CH6

Secondary 1 · Lower Secondary Science (G2 / G3)

Mark scheme

Model of Cells

Chapter 6 Practice Paper · Maximum mark: 30

Notes for markers

  • Award one mark for each point marked [1], up to the marks shown for the part.
  • Accept answers worded differently that show the same understanding.
  • Units are required where the answer line shows one. ecf: allow an error carried forward.

Section A: Multiple-choice questions[10 marks]

QuestionAnswer
1ADNA is stored in the nucleus. The wall, the vacuole and the chloroplast do not hold the cell’s genetic material.1
2CChloroplasts are the site of photosynthesis. Animal cells do not have them.1
3BThe membrane controls movement into and out of the cell. The wall supports a plant cell.1
4DCells form tissues, tissues form organs, and organs form systems.1
5AA cell, then a tissue (the layer), then an organ (the leaf), then a system.1
6CThe cell wall and the large sap space identify a plant cell. A colourless storage cell does not need chloroplasts.1
7DDo not swap the jobs of the wall and the membrane.1
8BCells were not known until microscopes made them visible.1
9ACytoplasm is the site of many of the cell reactions in this model.1
10CThe large permanent vacuole is part of the plant-cell model. Animal cells do not have it.1

Section B: Structured questions[20 marks]

QuestionAnswer and marking pointsMarks
1(a)

Slide R. It has a cell wall and a large sap space, and it is green because of chloroplasts.

  • Slide R [1]
  • First plant feature, such as the cell wall [1]
  • Second plant feature, such as chloroplasts or the large sap space [1]
3
1(b)

Nucleus [1]

1
1(c)

Many of the cell chemical reactions happen there.

  • Site of many chemical reactions [1]
1
Total for Question 15
2(a)

The cell wall supports the plant cell. The cell membrane controls what enters and leaves.

  • Cell wall supports / gives shape [1]
  • Cell membrane controls what enters and leaves [1]
2
2(b)

Different cells do different jobs. The leaf cell has chloroplasts and makes food. The root cell absorbs water and has no chloroplasts.

  • Different cells do different jobs [1]
  • Leaf cell makes food / has chloroplasts [1]
  • Root cell absorbs water / has no chloroplasts [1]
3
Total for Question 25
3(a)

Mesophyll cell, vein, leaf, whole shoot.

  • Cell, then vein, then leaf (organ), then shoot (system) [1]
1
3(b)

It contains more than one tissue, and the tissues work together for a job such as photosynthesis.

  • It is made of tissues [1]
  • The tissues work together for a function [1]
2
3(c)

Direct sunlight can damage the eye. The lamp is a safer light source.

  • Sunlight can damage the eye / the lamp is safer [1]
1
3(d)

The genetic material in the nucleus. It can be passed to the next generation.

  • Genetic material / passed to the next generation [1]
1
Total for Question 35
4(a)

It is a simplified picture of a common animal cell, not a drawing of every animal cell.

  • It is a simplified picture [1]
  • Not every animal cell looks exactly like it [1]
2
4(b)

Any one: cell wall; chloroplasts; large central vacuole.

  • Cell wall, chloroplasts or large central vacuole [1]
1
4(c)

It has a cell wall, and usually a large vacuole. Chloroplasts are for photosynthesis, which a root cell does not do.

  • It has a cell wall or a large vacuole [1]
  • Chloroplasts are only needed for photosynthesis [1]
2
Total for Question 45

— End of mark scheme —