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Biological Classification
Find out what do the terms ‘algal bloom’ and ‘red-tides’ signify.
Algal bloom refers to an increase in the population of algae or blue-green algae in water due to an enrichment of nutrients, resulting in discoloration of the water body. This causes an increase in the biological oxygen demand (BOD), resulting in the death of fishes and other aquatic animals.
Red tides are caused by red dinoflagellates (Gonyaulax) that multiply rapidly. Their large numbers in the sea makes the sea appear red in colour. These release a large amount of toxin which results in the death of other marine organisms.
Both of these signify the pollution of the water bodies.
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Plants are autotrophic. Can you think of some plants that are partially heterotrophic?
What do you the terms phycobiont and mycobiont signify?
Give a comparative account of the classes of Kingdom Fungi under the following:(i) Mode of nutrition (ii) Mode of reproduction.
What are the characteristic features of Euglenoids?
Give a brief account of viruses with respect to their structure and nature of genetic material. Also name four common viral diseases.
Organise a discussion in your class on the topic- Are viruses living or non-living?
____ appear as red tides in sea, by undergoing rapid multiplication.
____ cause wheat rust.
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