Viroids are smaller than viruses in size.
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How?Īns: Viruses can have either RNA or DNA molecules enclosed in a protein coat, whereas viroids are free RNA molecules with low molecular weight and no protein coat. Viruses and viroids differ in structure and the diseases they cause. They are dangerous because they emit chemicals that destroy aquatic animals.Ĥ.
Why are red tides caused and why are they harmful?Īns : Dinoflagellates such as Gonyaulax have a rapid multiplication rate. By transferring DNA from one person to another, sexual reproduction is possible.ģ. What is the mode of reproduction in bacteria?Īns: Mostly by fission spore production in difficult conditions. Spirillum (comma-shaped) and Vibrium (spiral-shaped).Ģ. How are alt bacteria classified on the basis of their shapes?Īns: Coccus (red-shaped Bacillus), Bacillus (red-shaped Bacillus) (spherical). Short Questions and Answers (2 Marks Questions)ġ. What are distributed organisms that have not been included under any kingdom?Īns: Virus & Viroids has not been included in any kingdom. Name the fungus that causes the rust of wheat?Īns: Puccinia graminis tritici is the fungus that causes the rust of wheat.ġ7. Why?Īns: To increase the fertility of the soil so it is advised to grow one pulse crop in between two main crops in the same field.Īns: It is the process of identifying evolutionary units within a species by determining their genetic origin through experimentation.ġ6. It is advised to grow one pulse crop in between two main crops in the same field. Name the fungus from which LSD drug is obtained?Īns: Claviceps purpurea is the name of fungus.ġ4. Who is known as the "Father of classification"?Īns: Carolus Linnaeus - Father of classificationġ3. In which class of fungi sexual reproduction does not occur?Īns: Deuteromycetes - sexual reproduction does not occur.ġ2. Which organisms are known as "Jokers of plant kingdom"ġ1. Name the five kingdoms in which the organisms are grouped together?Īns: Monera, Protista, Fungi, Plantae & Animalia -5 kingdomsġ0. To which kingdom do the multicellular decomposers belong?Īns: Kingdom fungi - multicellular decomposers.Īns: Pleuropneumonia like organisms stands for PPLO.ĩ. Whittaker (1969) introduced the five kingdoms.ħ. Who introduced the five-kingdom classification of organisms?Īns: R.H. Which ascomycetes have been used extensively in biochemical and genetic work.Īns : Neurospora used in biochemical and genetic work.Ħ. Name the fungus which causes disease in wheat (i)rust (ii) Smut.Īns: (i) Puccinia, (ii) Ustilago are the fungus that causes disease in wheat.ĥ.
Which organisms are the chief producers in oceans?Īns: Diatoms are the chief producers in oceans.Ĥ. Īns : Kingdom Protista comprises single-celled eukaryotes.ģ. Which group comprises single-celled eukaryotes only. What is the function of these cells?Īns: Assist in the nitrogen fixation process.Ģ. Nostoc and Anabaena have specialised cells called heterocysts. Very Short Questions and Answers (1 Marks Questions)ġ.
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