Which of the blood corpusles are irregular and amoeloid in shape

Step 1: Analyze the question The question asks which blood corpuscle (blood cell) is irregular and amoeboid (amoeba-like) in shape. Plasma is the liquid part of blood, so it isn't a corpuscle at all. That rules out D.

Step 2: Recall the concept Blood has three types of cells:

• Erythrocytes (red blood cells): biconcave discs with a regular, round shape. They have no nucleus and carry oxygen.
• Leucocytes (white blood cells): irregular in shape, with a nucleus. They can change shape and move like an amoeba, which lets them squeeze through capillary walls (diapedesis) and engulf bacteria by phagocytosis.
• Thrombocytes (platelets): small cell fragments involved in blood clotting. They are tiny and disc-like or oval, though they can become irregular when activated.

Step 3: Eliminate options

• B. Erythrocytes are regular biconcave discs, so no.
• C. Thrombocytes are tiny fragments, not typically described as amoeboid, so no.
• D. Plasma is not a corpuscle, so no.
• A. Leucocytes are irregular and amoeboid, which fits.

Step 4: Answer The correct option is A. Leucocytes.

Exam tip: Remember "Leucocytes = Looks like amoeba, fights germs." White blood cells are the body's defenders, and their amoeboid movement is how they reach and swallow germs. Red cells are the regular, disc-shaped ones.