Cell structure (animal cells) — KCSE Biology

KCSE Biology · 97 practice questions · 3 syllabus objectives

35 easy35 medium27 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Draw and label an animal cell as seen under an electron microscope

Distinguish between plant and animal cells

Cell structure (animal cells)

Sample Questions

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1
easySHORT ANSWER4 marks

In the study of microscopic organisms, understanding the components and functions of a light microscope is essential for accurate observation and analysis. This knowledge enables students to effectively explore the intricate details of animal cell structures. (a) State the function of each of the following parts of a light microscope: (i) Eyepiece lens (1 mark) (ii) Revolving nosepiece (1 mark) (iii) Fine adjustment knob (1 mark) (b) Which part of the microscope is used to obtain a sharper outline of a specimen under high power? (1 mark)

View Marking Scheme
Part (a_i) — 1 mark
Magnifies the image produced by the objective lens for viewing; (1 mk)
Part (a_ii) — 1 mark
Holds the objective lenses and allows rotation to change magnification; (1 mk)
Part (a_iii) — 1 mark
Brings the specimen into rough/approximate focus by raising or lowering the body tube; (1 mk)
Part (b) — 1 mark
Fine adjustment knob; (1 mk)
2
easyCalculation3 marks

In the study of cellular biology, understanding the measurements and magnification techniques is essential for accurately analyzing the intricate structures of animal cells. This knowledge is fundamental for students as they explore the microscopic world. (a) Convert 2 mm to μm (micrometres). (1 mark) (b) Convert 1500 μm (micrometres) to mm. (1 mark) (c) State the formula used to calculate the magnification of an object viewed under a light microscope. (1 mark)

View Marking Scheme
Part (a) — 1 mark
2000 μm (micrometres); (1 mk)
Part (b) — 1 mark
5 mm; (1 mk)
Part (c) — 1 mark
Magnification = Image size ÷ Actual size; (or Magnification = Eyepiece lens × Objective lens); (1 mk)
3
easySHORT ANSWER4 marks

In the study of microscopic organisms, understanding the components and functions of a light microscope is essential for accurate observation and analysis. This knowledge enables students to effectively explore the intricate details of animal cell structures. (a) State the function of each of the following parts of a light microscope: (i) Eyepiece lens (1 mark) (ii) Condenser (1 mark) (iii) Fine adjustment knob (1 mark) (b) Which part of the microscope is used to obtain a sharper outline of a specimen under high power? (1 mark)

View Marking Scheme
Part (a_i) — 1 mark
Produces the primary magnified image of the specimen; (1 mk)
Part (a_ii) — 1 mark
Holds the objective lenses and allows rotation to change magnification; (1 mk)
Part (a_iii) — 1 mark
Provides illumination/directs light through the specimen; (1 mk)
Part (b) — 1 mark
Fine adjustment knob; (1 mk)
4

In the study of cellular biology, understanding the measurements and magnification techniques is essential for accurately analyzing the intricate structures of animal cells. This knowledge is fundamental for students as they explore the microscopic world. (a) Convert 0.5 mm to μm (micrometres). (1 mark) (b) Convert 5000 nm (nanometres) to μm (micrometres). (1 mark) (c) State the formula used to calculate the magnification of an object viewed under a light microscope. (1 mark)

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