Based on analysis of NEET questions from 2015-2024, the following are the highest-frequency tested concepts in Plant Kingdom (CL-02):
Rank 1 — Agar Source (appears almost every year): Agar is obtained from RED algae — specifically Gelidium and Gracilaria (Rhodophyceae). NOT from brown algae (which yield algin). This single fact has been tested in multiple formats: direct MCQ, matching, trap MCQ, and assertion-reason.
Rank 2 — Dominant Phase in Life Cycles: Bryophytes = gametophyte dominant. Pteridophytes + all higher plants = sporophyte dominant. The specific name of the pteridophyte gametophyte (prothallus) and the bryophyte sporophyte structure (foot + seta + capsule) are tested separately.
Rank 3 — Heterosporous Pteridophytes: Only Selaginella and Salvinia are heterosporous. All others (Dryopteris, Equisetum, Adiantum) are homosporous. Heterospory is connected to seed habit evolution.
Rank 4 — Gymnosperms (Monoecious vs Dioecious): Pinus = monoecious. Cycas = dioecious. Ginkgo = dioecious. Often paired with "which gymnosperm is X?" questions.
Rank 5 — Exclusive Angiosperm Features: Double fertilization and flowers. Fruits. 7-celled embryo sac. Endosperm = 3n (triploid). Questions appear as "which feature is exclusive to angiosperms?" with options including shared features (seeds, vascular tissue).
Rank 6 — Monocot vs Dicot Identification: Vascular bundle arrangement (scattered vs ring), venation (parallel vs reticulate), root type (fibrous vs tap), and flower parts (trimerous vs pentamerous) — all tested via identification and matching.
Rank 7 — Algae Pigment Matching: Matching algal class to second chlorophyll (b/c/d), accessory pigment , and storage product (starch/laminarin/floridean starch).