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Plant Kingdom: Cyanophyta and Myxophyta

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Questions and Answers

Which pigment is unique to cyanophyta in addition to bacterial chlorophyll?

Carotenoids

Xanthophylls

Phycocyanin (correct)

Chlorophyll-B

What is the significance of cyanophyta in the history of Earth's atmosphere?

They were the first organisms to release elemental oxygen into the atmosphere (correct)

They contributed to the greenhouse effect

They caused depletion of atmospheric oxygen

They were responsible for the formation of ozone layer

What is the main characteristic of cyanophyta?

Lack of photosynthetic pigments

Presence of nucleus and flagella

Existence as unicellular, colonial, or filamentous forms (correct)

Predominantly terrestrial habitat

What special cells are found in some cyanophyta members, representing sites of protein synthesis?

Heterocysts Signup and view all the answers

What is the reserved food form in cyanophyta?

Glycogen Signup and view all the answers

What is the primary function of heterocysts in blue-greens like Anabaena and Nostoc?

Converting nitrogen gas into ammonium Signup and view all the answers

What purpose do akinetes serve in blue-green algae?

Serve as 'seeds' for the growth of juvenile filaments when favorable conditions return Signup and view all the answers

What is the primary function of phycocyanin in blue-green algae?

Contributing to the blue-green color of cells Signup and view all the answers

How do cyanobacteria primarily reproduce?

By vegetative and asexual methods such as fission, fragmentation, and hormogonia formation Signup and view all the answers

What is the chemical composition of the inner layer of the cell wall in blue-green algae?

Peptidoglycans Signup and view all the answers