Discussion
Correctly match the carnivorous plants (Group I) with the organs (Group II) they modify to trap the prey.
| Group I | Group II |
|---|---|
| (P) Pitcher plant (Nepenthes) | (1) Leaf |
| (Q) Bladderwort (Utricularia) | (2) Fruit |
| (R) Sundew (Drosera) | (3) Stem |
| (S) Venus flytrap (Dionaea) | (4) Tendril |
Answer: B
The correct match is P-1; Q-1; R-1; S-1: all four trap prey with modified leaves.
- The pitcher of Nepenthes is a modified leaf blade, with the tendril-like midrib extension carrying the pitcher and its lid.
- The bladders of Utricularia are modified leaf segments that suck in small animals.
- The sticky glandular tentacles of Drosera cover the surface of its leaves.
- The snap trap of Dionaea is the two-lobed leaf blade, which closes when its trigger hairs are touched.
No carnivorous plant traps prey with fruits or stems, so every option using fruit (2) or stem (3) is wrong. The tendril of Nepenthes is itself part of the leaf, so it does not make the pitcher a separate organ type.
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