Q.Select the correct biological term.
Lymphocytes, red cells, leucocytes, plasma, erythrocytes, white cells, haemoglobin, phagocyte, platelets, blood clot.
a. Disc shaped cells which are concave on both sides
b. Most of these have a large, bilobed nucleus
c. Enable red cells to transport blood
d. The liquid part of the blood
e. Most of them move and change shape like an amoeba.
f. Consists of water and important dissolved substances.
g. Destroyed in the liver and spleen after circulating in the blood for four months.
h. The substances which gives red cells their colour.
i. Another name for red blood cells.
j. Blood that has been changed to a jelly.
k. A word that means cell eater.
l. Cells without nucleus.
m. White cells made in the lymphatic tissue.
n. Blocks wound and prevent excessive bleeding.
o. Fragment of cells which are made in the bone marrow.
p. Another name for white blood cells.
q. Slowly releases oxygen to blood cells.
r. Their function is to help blood clot in wounds.

Step 1. Cell-shape and colour clues. (a) 'Disc shaped cells which are concave on both sides' describes the biconcave shape of red cells. (h) 'The substance which gives red cells their colour' is haemoglobin, the pigment inside red cells. (i) 'Another name for red blood cells' is erythrocytes, the technical synonym used alongside 'red cells'.

Step 2. White-cell clues. (b) 'Most of these have a large, bilobed nucleus' and (e) 'Most of them move and change shape like an amoeba' both describe the amoeboid, variably-lobed-nucleus behaviour typical of leucocytes generally. (m) 'White cells made in the lymphatic tissue' is lymphocytes specifically, since the chapter states agranulocytes (including lymphocytes) are differentiated in the lymph glands and spleen. (p) 'Another name for white blood cells' is leucocytes, the technical synonym for 'white cells'.

Step 3. Plasma clues. (d) 'The liquid part of the blood' and (f) 'Consists of water and important dissolved substances' both describe plasma, the fluid matrix that carries the dissolved proteins, ions and nutrients.

Step 4. Clotting and platelet clues. (j) 'Blood that has been changed to a jelly' is a blood clot, the semisolid clump formed once fibrin traps blood cells. (l) 'Cells without nucleus' fits platelets, which (like mature RBCs) have no nucleus. (n) 'Blocks wound and prevent excessive bleeding' and (r) 'Their function is to help blood clot in wounds' both describe the platelet plug/clotting role of platelets. (o) 'Fragment of cells which are made in the bone marrow' is platelets, since they are pinched-off fragments of bone-marrow megakaryocytes. …

Match each lettered clue's specific wording to the one word-bank term whose known structure or function fits it …

• Assuming each word bank term is used only once, when several genuinely fit more than one clue (e.g., platelets fits l, n, o and r). …