Study the following diagram carefully and then answer the questions that follow:
(a) Name the cell labelled 1.
(b) Identify the phenomenon occurring in A.
(c) Mention two structural differences between 1 and 2.
(d) Name the process occurring in B and C and state the importance of this process in the human body.

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Solution

a. 1 – Red blood cell
b. Diapedesis
c.
RBC WBC
They lack a nucleus. They have a nucleus.
They are biconcave and disc-shaped. They are spherical and have different sizes.
d. The process which occurs in B and C is phagocytosis. In this process, the WBCs engulf the foreign particles and destroy them, thus preventing the occurrence of disease.

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