I: | No virus contains both RNA and DNA. |
II: | A virus is a nucleoprotein and the genetic material is infectious. |
III: | In general, viruses that infect plants have single stranded RNA. |
IV: | Bacterial viruses or bacteriophages (viruses that infect the bacteria) are usually double stranded DNA viruses. |
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
I: | Viroids were discovered by Thomas Cech in 1998. |
II: | The RNA of the viroid is of a very high molecular weight. |
Statement I: | The algal component in lichen is known as phycobiont and fungal component as mycobiont, which are autotrophic and heterotrophic, respectively. |
Statement II: | Lichens are very good pollution indicators – they grow profusely in polluted areas. |
Statement I: | Viruses are obligate cellular endoparasites. |
Statement II: | Once they infect a cell they take over the machinery of the host cell to replicate themselves, killing the host. |
A. | Basidium | Bears spores |
B. | Basidiospores | Asexual Spores |
C. | Basidiocarp | Fruiting body |
I: | are called conidia. |
II: | are produced endogenously |
1. | Only I is correct | 2. | Only II is correct |
3. | Both I and II are correct | 4. | Both I and II are incorrect |
I. | Phycomycetes |
II. | Ascomycetes |
III. | Deuteromycetes |
IV. | Basidiomycetes |
1. | Plasmogamy – Karyogamy – Mitosis in zygote resulting in diploid spores |
2. | Plasmogamy – Karyogamy – Meiosis in zygote resulting in haploid spores |
3. | Karyogamy – Plasmogamy – Mitosis in zygote resulting in diploid spores |
4. | Karyogamy – Plasmogamy – Meiosis in zygote resulting in haploid spores |
I: | Their bodies consist of long, slender thread-like structures called hyphae. |
II: | The network of hyphae is known as mycelium. |
III: | Some hyphae are continuous tubes filled with multinucleated cytoplasm – these are called coenocytic hyphae. |
IV: | The cell walls of fungi are composed of chitin and polysaccharides. |