Match the items given in column A with the most appropriate ones in Column B and REWRITE the correct matching pairs:
Column A: (i) Biston betularia (ii) Testes (iii) Clotting of blood (iv) Stroma (v) Stomata Column B: – Calcium – balance of the body – Light independent reaction – diffusion of gases – gonad – Peppered moth – Light dependent reaction – Chlorophyll
Topic: Matching — structures and functions
Answer
(i) Biston betularia – Peppered moth (ii) Testes – gonad (iii) Clotting of blood – Calcium (iv) Stroma – Light independent reaction (v) Stomata – diffusion of gases
Column B has EIGHT options for FIVE items, so three are distractors and will be left over. Do not force a match.
Taking them in turn: BISTON BETULARIA is the scientific name of the PEPPERED MOTH, the classic example of industrial melanism and natural selection. TESTES are the male GONAD — a gonad being an organ that produces gametes. CLOTTING OF BLOOD requires CALCIUM ions, without which prothrombin cannot be converted to thrombin. STROMA is the fluid matrix of the chloroplast and the site of the LIGHT INDEPENDENT reaction (the dark reaction). STOMATA are the pores through which DIFFUSION OF GASES occurs.
THE TWO DELIBERATE TRAPS among the leftovers: "Light DEPENDENT reaction" belongs to the GRANA, not the stroma — the two are placed together to test which is which. "CHLOROPHYLL" is also in the grana, not the stroma. "Balance of the body" belongs to the cerebellum or the semicircular canals, and matches nothing in Column A.
STRATEGY: do the certain pairs first and let elimination settle the rest.