I: | In diatoms, the cell walls form two thin overlapping shells which fit together as in a soap box |
II: | The walls are embedded with silica and thus are indestructible |
III: | The fossilized diatoms are called diatomaceous earth |
IV: | Diatoms are not the main producers in the oceans |
V: | Diatomaceous earth is used in polishing, filtration of oil and syrups |
Column -I | Column-II |
A. Plasmodium | (i) Diatoms |
B. Mixotrophic nutrition | (ii) Euglenoids |
C. Red tide | (iii) Dinoflagellates |
D. Oceanic chief producers | (iv) Slime moulds |
I: | Their body consists of long, slender thread-like structures called hyphae |
II: | The network of hyphae is called mycelium |
III: | Hyphae may be continuous tubes filled with multinucleated cytoplasm, these hyphae are coenocytic |
IV: | In many cases hyphae have septate or cross walls |
V: | The cell wall of fungi are composed by chitin and polysaccharides |
I: | Sex organs are commonly present |
II: | Plasmogamy is brought about by the fusion of two vegetative or somatic cells of different strains or genotypes |
III: | The dikaryotic structure may give rise to the basidium |
IV: | Karyogamy and Meiosis take place in the basidium producing four ascospores |
V: | The basidiospores are exogenously produced on the basidium |
Column-I | Column-II |
A. Ascomycetes | (i) Club fungi |
B. Basidiomycetes | (ii) Sac fungi |
C. Deuteromycetes | (iii) Algae fungi |
D. Phycomycetes | (iv) Fungi imperfecti |