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Discuss how classification systems have undergone several changes over a period of time?

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State two economically important uses of:
(a) Heterotrophic bacteria
(b) Archaebacteria

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What is the nature of cell-walls in diatoms?

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Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.

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Viruses	Viriods
1. Larger in size.	1. Smaller in size.
2. Have protein coat.	2. Lack protein coat.
3. RNA of higher molecular weight.	3. RNA of low molecular weight.
4. May have DNA or RNA.	4. Only RNA is present.

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Describe briefly the four major groups of Protozoa.

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Plants are autotrophic. Can you think of some plants that are partially heterotrophic?

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What do you the terms phycobiont and mycobiont signify?

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Give a comparative account of the classes of Kingdom Fungi under the following:(i) Mode of nutrition (ii) Mode of reproduction.

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10.

What are the characteristic features of Euglenoids?

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