Home / iGCSE / Coordinated Sciences / B2.1 Cell structure Paper 3

CIE iGCSE Co-Ordinated Science B2.1 Cell structure Exam Style Questions Paper 3

CIE iGCSE Co-Ordinated Science Paper 3 - All Chapters

Question

Fig. 3.1 is a diagram of a palisade cell from a potato plant.
(a)(i) Identify all the structures, labelled in Fig. 3.1, that are also in animal cells.
      (ii) Describe the functions of the cytoplasm and the cell wall.
(b) Aerobic respiration takes place in mitochondria to release energy.
      (i) State the word equation for aerobic respiration.
      (ii) State one use of energy from respiration in living organisms.
(c) A student cuts a small piece of potato.
The student measures the mass of the piece of potato.
The student puts the piece of potato in pure water (water with no chemical impurities).
Describe the effect of the pure water on the mass of the piece of potato.
Include the name of the process in your answer.
(d) Plants are made up of different parts.
Use words from the list to complete the sentence about plants.
organs        tissues        cells        organ systems
Plant leaves are thin, flat …………………… made up of …………………… including phloem and epidermis.

Most-appropriate topic codes (Cambridge IGCSE Co-ordinated Sciences 0654):

• Topic B2.1 — Cell structure (Part (a)(i))
• Topic B2.1 — Cell structure (Part (a)(ii))
• Topic B12.1 — Respiration (Part (b))
• Topic B3.2 — Osmosis (Part (c))
• Topic B2.1 — Cell structure (Part (d))

▶️ Answer/Explanation

(a)(i) cell membrane, cytoplasm, mitochondria, nucleus
These structures are found in both plant and animal cells. Chloroplasts, cell walls and large vacuoles are present only in plant cells.

(a)(ii) Cytoplasm: site of metabolic/chemical reactions ; Cell wall: protects/supports the cell
The cytoplasm is where most cellular reactions occur. The cell wall provides structural support and protection, maintaining the shape of the cell.

(b)(i) glucose + oxygen → carbon dioxide + water
Aerobic respiration uses glucose and oxygen to release energy, producing carbon dioxide and water as waste products.

(b)(ii) Protein synthesis / cell division / growth / muscle contraction / passage of nerve impulses / maintenance of constant body temperature / active transport
Energy from respiration is used for many essential life processes including growth, movement and active transport across cell membranes.

(c) Water moves into the potato tissue ; mass increases ; osmosis
Pure water has a higher water potential than the potato cells. Water moves into the potato cells by osmosis through the partially permeable cell membrane, causing the mass to increase.

(d) Plant leaves are thin, flat organs made up of tissues including phloem and epidermis.
Leaves are organs composed of different tissues such as epidermal tissue and vascular tissue (phloem and xylem).

Question

Fig. 1.1 is a diagram of a bacterial cell.
(a) Name the part of the cell labelled A in Fig. 1.1.
(b) Describe the function of the cell membrane.
(c) Some bacteria are pathogens. State what is meant by a pathogen.
(d) Pathogens are transmitted by direct contact or indirectly from one human to another.
Table 1.1 shows some methods of transmission.
Place ticks (✓) in Table 1.1 to show if each method of transmission is direct contact or indirect.
(e) The body defends itself against pathogens.
On Fig. 1.2, draw one straight line from each defence to how it stops pathogens.
(f) State the type of drug used as a treatment for bacterial infections.

Topic codes:

• Topic B2.1 — Cell structure (Part (a) & (b))
• Topic B10.1 — Diseases and immunity (Part (c), (d), (e) & (f))

▶️ Answer/Explanation

(a) Cell wall
The bacterial cell wall provides structural support and protection to the cell.

(b) The cell membrane controls what enters and leaves the cell.
The cell membrane is selectively permeable, allowing certain substances to pass through while blocking others.

(c) A pathogen is a disease-causing organism.
Pathogens include bacteria, viruses, fungi and protists that can cause infectious diseases.

(d) Table 1.1 completed:

(e) Matching defences:
• Skin → acts as physical barrier, stopping entry of pathogens
• Mucus → traps pathogens before they enter lungs
• Stomach acid → destroys pathogens in food
• White blood cells → produces antibodies

(f) Antibiotics
Antibiotics are drugs used to treat bacterial infections by killing bacteria or preventing their reproduction.

More CIE iGCSE Co-Ordinated Science Paper 3 Questions..
Scroll to Top