TMV (Tobacco Mosaic Virus)
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Functions of Roots
Primary functions of roots:- 1. They help in fixing the plant firmly with the soil. 2. The roots absorb water and mineral salts. 3. It binds the soil. Secondary functions of roots:- 1. Root floats:- They help in floating. e.g jussiaea 2. Reproductive roots:- They can help in multiplication of plants i.e vegetative propagation e.g. sweet potato. 3. Hygroscopic roots:- They can absorb the water from atmosphere with the help of special tissue velamen e.g Vanda 4. Assimilatory roots:- They help in synthesis of food e.g:- Podostemon 5. Respiratory roots:- They may serve for respiration e.g:- Rhizophora. 6. Storage of food:- They can store the food by becoming fleshy e.g:- Radish 7. Helping plants to climb:- They may help in climbing the weak stem e.g:- Pothos
What is Virus?
What is virus? Virus may be defined as an ultra microscopic disease producing nucleoprotein particle that can multiply only within living organisms. Virus is Living or Non Living? Virus is living inside the body while non-living outside the body of an organism. Non-living characters of virus:- 1. Viruses are non-cellular entities. 2. Viruses can grow and multiply only in living cells. 3. Viruses have high specific gravity. 4. Viruses do not response to environmental changes. 5. Viruses only bears only one type of nucleic acid i.e DNA or RNA. Living characters of virus:- 1. All viruses are pathogenic i.e disease producing particles. 2. They show reproduction and multiplication in the living organisms. 3. Viruses are obligate parasites. 4. Viruses exhibit mutations and are of capable of producing new variants. 5. They bear genetic material. 6. They become inactive by treatment of pepsin. 7. Viruses can bring out enzymatic changes in vitro. 8. They respond to t
