The Angiosperm Phylogeny Group IV (APG IV) system represents a modern approach to plant classification, specifically focusing on flowering plants (angiosperms). This system relies on specific characteristics to group plants according to their evolutionary relationships.
The question asks for the basis of the APG IV system among the given options:
Based on the provided options and answer, the APG IV system is identified as being based on anatomical characters of plants. This means that the internal structure and organization of plant tissues and organs are considered key features for classification within this system.
While modern classification systems like APG IV heavily utilize molecular data (DNA sequences), this specific question emphasizes anatomical features as the primary basis among the choices presented.
| List - I | List - II |
|---|---|
| A. Topoisomerase | I. Twist the double helix at the replication fork, separating to parental strands |
| B. Helicases | II. Joining the sugar phosphate backbones of all the Okazaki fragments |
| C. DNA polymerase | III. Help to relieve the twisting strain ahead of the replication |
| D. DNA ligase | IV. Catalyze the synthesis of new DNA by adding nucleotides |
| List - I (Structure) | List - II (Taxa) |
|---|---|
| A. Absence of Archegonia | I. Pinus |
| B. Antherozoids with Cilia | II. Gnetum |
| C. Resin duct | III. Taxus |
| D. Aril | IV. Cycas |