Describe the important characteristics of gymnosperms.
Describe the important characteristics of gymnosperms.

Describe the important characteristics of gymnosperms.
What is the basis of classification of algae?
Describe briefly the four major groups of Protozoa.
How are viroids different from viruses?
Discuss how classification systems have undergone several changes over a period of time?
Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.
What is the nature of cell-walls in diatoms?
State two economically important uses of:
(a) heterotrophic bacteria
(b) archaebacteria
Organise a discussion in your class on the topic – Are viruses living or non-
living?
Give a brief account of viruses with respect to their structure and nature of
genetic material. Also name four common viral diseases.
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