Q.Write the differences between:

The chief differences are:

1. Blood vs Lymph: Blood is red and contains all the formed elements (red cells, white cells and platelets) with protein-rich plasma; lymph is colourless, lacks red cells and platelets, carries mainly lymphocytes, and has less protein.
2. Open vs Closed circulation: In an open system the heart pumps blood into open spaces called sinuses, so the blood bathes the tissues directly (arthropods, molluscs); in a closed system the blood stays within blood vessels throughout, allowing flow to be finely regulated (annelids, chordates).
3. Systole vs Diastole: Systole is the contraction of the heart chambers that drives blood forward; diastole is their relaxation, during which the chambers fill again. …

1. Blood and Lymph. Both are body fluids, and lymph is in fact derived from blood, but they are not alike. Blood is red and carries the full complement of formed elements — erythrocytes, leucocytes and platelets — in a plasma rich with proteins. Lymph is colourless; it lacks red blood cells and platelets, and the cells it carries are mainly lymphocytes. It also holds less protein than blood, because the large plasma proteins cannot easily seep out of the capillaries into the tissue spaces from which lymph forms.
2. Open and Closed system of circulation. In an open circulatory system, seen in arthropods and molluscs, the heart pumps blood into large vessels that open into spaces or body cavities called sinuses, so the blood directly bathes the tissues. In a closed circulatory system, seen in annelids and chordates, the blood pumped by the heart always remains within a closed network of vessels. The closed plan is considered more advantageous because, with the fluid confined to vessels, its flow can be regulated far more precisely. …

Method: Answering a Multi-Part "Differences Between" Question

Use this approach whenever a question lists several lettered pairs (a),

(b),

(c)... each asking for a distinction.

Steps

Step 1: Treat each lettered pair as its own self-contained mini-question

Do not let facts from one pair bleed into another — answer (a) completely before moving to (b).

Step 2: For each pair, ask what CLASS of thing is being compared

Two fluids, two systems, two phases, two ECG waves — identifying the class tells you which comparison points are even relevant, so you don't compare irrelevant features.

Step 3: Build a short 2-3 point contrast using the defining features of that class …