Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.

Name the most common viral disease

Name the genetic material found in viruses.

Name any three viruses which have RNA as the genetic material.

Give an account of some important viral diseases of human beings.

Distinguish between (a) Plant viruses and animal viruses on the basis of genetic material. (b) Plant viruses and bacteriophages on the basis of genetic material (c) Plant viruses and animal viruses on the basis of the symptoms of diseases caused by them.

(A) Name the different pigment found in Algae (B) What are rhizoids and what is their functions ? (C ) Give a brief account of economic importance of gymnosperms. (D) Name the four divisions of seedless vascular and give on example of each. Which plant is considered as earliest vascular land plant ? (E) Name the first antgiosperm and give its approximate age.

Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the presence of an encironmental factor C and a green material D to from a six carbon organic compoind E and a gas F. The gas F is necessary for breating. (a) What is gas A ? (b) What is the common name of B ? (c ) What do you think could be C ? (d) What is material D ? Where is it found ?

Write the structures of isomeric hexynes and also give their IUPAC names.

Give an account of the distinguishing features of family Solanaceae. Give botanical names of four plants of economic value belonging to this family.