Specialized cells tissues and organs Worksheet - SPECIALIZED CELLS ... - Free Printable

Let's solve this step by step based on the diagram and the questions provided.

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Part (a): Name each type of cell

We are given five labeled diagrams (A to E) representing specialized human cells. Let's identify them:

- A: This is a red blood cell (erythrocyte). It is biconcave, lacks a nucleus, and contains hemoglobin.
- B: This is a neuron (nerve cell). It has a long axon and dendrites for transmitting electrical impulses.
- C: This is a sperm cell. It has a head with genetic material, a midpiece with mitochondria, and a tail (flagellum) for movement.
- D: This is a ciliated epithelial cell (e.g., in the trachea). It has cilia on its surface that help move mucus and trap dust/bacteria.
- E: This is a white blood cell (leukocyte), specifically a phagocytic cell like a neutrophil or macrophage. It can ingest bacteria (phagocytosis).

✔ So, the answers are:
- A: Red blood cell
- B: Neuron
- C: Sperm cell
- D: Ciliated epithelial cell
- E: White blood cell

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Part (b): Give the letter (A, B, C, D, or E) which...

#### (i) does not contain a nucleus.
- Red blood cells (A) do not have a nucleus in humans (they lose it during maturation).
- ✔ Answer: A

#### (ii) traps dust and bacteria.
- Ciliated epithelial cells (D) have cilia that move mucus trapping dust and bacteria.
- ✔ Answer: D

#### (iii) has half the normal number of chromosomes.
- Sperm cells (C) are gametes (reproductive cells), so they are haploid — they have half the number of chromosomes (n) compared to somatic cells (2n).
- ✔ Answer: C

#### (iv) can ingest bacteria.
- White blood cells (E) perform phagocytosis — engulfing and digesting bacteria.
- ✔ Answer: E

#### (v) carries information as electrical impulses.
- Neurons (B) transmit nerve signals via electrical impulses along their axons.
- ✔ Answer: B

#### (vi) contains haemoglobin.
- Haemoglobin is found in red blood cells (A) to carry oxygen.
- ✔ Answer: A

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✔ Final Answers:

#### (a) Name each type of cell:
- A: Red blood cell
- B: Neuron
- C: Sperm cell
- D: Ciliated epithelial cell
- E: White blood cell

#### (b)
(i) Does not contain a nucleus → A
(ii) Traps dust and bacteria → D
(iii) Has half the normal number of chromosomes → C
(iv) Can ingest bacteria → E
(v) Carries information as electrical impulses → B
(vi) Contains haemoglobin → A

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This completes the solution with clear explanations. Let me know if you'd like a diagram-based summary!