Match the items given in Column I with most appropriate ones in Column II and rewrite the correct matching pairs:
Column I: (a) Leydig Cells, (b) Stoma, (c) Ova, (d) Cranial nerve, (e) Cretinism Column II: 1. Lack of thyroxine in children, 2. 12 pairs, 3. Testosterone, 4. Diffusion of respiratory gases, 5. Haploid cells, 6. 31 pairs, 7. Diploid cells
Topic: Matching — structures and their features
Answer
(a) Leydig Cells – 3. Testosterone (b) Stoma – 4. Diffusion of respiratory gases (c) Ova – 5. Haploid cells (d) Cranial nerve – 2. 12 pairs (e) Cretinism – 1. Lack of thyroxine in children
Note that Column II has SEVEN options for FIVE items — two are distractors and will be left over. That is deliberate, so do not force a match.
Taking them in turn: LEYDIG CELLS lie between the seminiferous tubules of the testis and secrete TESTOSTERONE. STOMA — the pore through which gases diffuse in and out of the leaf. OVA are gametes, so they are HAPLOID (23 chromosomes in humans). Option 7, diploid, is the distractor here — body cells are diploid, gametes are not. CRANIAL NERVES — 12 PAIRS, arising from the brain. Option 6, 31 pairs, is the distractor: that is the number of SPINAL nerves. Learn them as a pair, 12 cranial and 31 spinal. CRETINISM — caused by a lack of thyroxine IN CHILDREN, producing stunted growth and mental retardation. The adult equivalent is myxoedema.
THE STRATEGY: do the certain pairs first and let elimination settle the rest. Here the two number options (2 and 6) and the two ploidy options (5 and 7) form obvious pairs, one right and one wrong in each.