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What is true about leucocytes?

1. Their sudden fall in number is indication of blood cancer.
2. These are produced in thymus.
3. These are enucleated.
4. These can squeeze out through the capillary walls.

Correct answer: These can squeeze out through the capillary walls.

Solution

Leucocytes can perform diapedesis, meaning they can squeeze through capillary walls to reach infected or damaged tissues. The other options are incorrect because leucocytes are not produced in the thymus alone, they are nucleated, and a sudden fall in their number is not the classic sign of blood cancer.

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