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Basophil is a type of white blood cell (leucocyte) that has a lobed nucleus surrounded by granular cytoplasm. Basophils are produced continually by stem cells in the red bone marrow & move about in an amoeboid fashion. Like mast cells, they produce histamine and heparin as part of the body's defences at the site of an infection or injury.

1. Basophils have a lobed nucleus and granular cytoplasm.
2. Basophils produce histamine and heparin.
3. Basophils are produced in the red bone marrow.
4. All of the above.

Correct answer: All of the above.

Solution

The passage states that basophils have a lobed nucleus with granular cytoplasm, are produced in red bone marrow, and produce histamine and heparin. Since A, B, and C are all true, the correct choice is the option that includes all of them.

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