cyanophyceae

Question 1

Why are cyanoprokaryotes commonly known as blue-green algae?

Answer 1

They are called blue-green algae due to the presence of the dominant pigment c-phycocyanin, which gives them a blue-green color.

Question 2

What are the main differences between cyanoprokaryotes and eukaryotic algae?

Answer 2

Cyanoprokaryotes lack a nuclear membrane, nucleolus, and organized cell organelles, unlike eukaryotic algae that have complex cell structures.

Question 3

What role do cyanoprokaryotes play in classification systems?

Answer 3

Cyanoprokaryotes bridge the gap between algae and bacteria, often classified with bacteria due to their prokaryotic structure.

Question 4

What is the genetic structure of cyanoprokaryotes?

Answer 4

Cyanoprokaryotes have a genome that is not enclosed by a nuclear membrane and lacks a nucleolus, characteristic of prokaryotic organisms.

Question 5

What pigments are found in cyanoprokaryotes?

Answer 5

A: Cyanoprokaryotes contain c-phycocyanin (blue-green pigment) and other pigments distributed throughout the chromoplasm.

Question 6

What major characteristic links cyanoprokaryotes to bacteria?

Answer 6

Cyanoprokaryotes share a prokaryotic cell structure with bacteria, lacking a defined nucleus and membrane-bound organelles.

Question 7

Why are cyanoprokaryotes classified as prokaryotes?

Answer 7

They are classified as prokaryotes due to their simple cell structure, lacking a nuclear membrane, nucleolus, and organized cell organelles, similar to bacteria.

Question 8

Who classified cyanoprokaryotes and bacteria in the same phylum?

Answer 8

Christensen (1962) classified both cyanoprokaryotes (Cyanophyta) and bacteria under the common phylum Prokaryota

Question 9

What is chromoplasm in cyanoprokaryotes?

Answer 9

Chromoplasm is the outer part of the protoplasm in cyanoprokaryotes where pigments are distributed.

Question 10

Where are pigments located in cyanoprokaryotes?

Answer 10

Pigments are distributed throughout the chromoplasm, which is the outer part of the protoplasm.

Question 11

What cell organelles are absent in cyanoprokaryotes?

Answer 11

Cyanoprokaryotes lack well-organized cell organelles like mitochondria and chloroplasts

Question 12

What kind of nucleus do cyanoprokaryotes have?

Answer 12

Cyanoprokaryotes have a prokaryotic nucleus, which means it lacks a nuclear membrane and a nucleolus.

Question 13

To which class do cyanoprokaryotes belong?

Answer 13

They belong to the class Myxophyceae, also known as Cyanophyceae.

Question 14

To which class do cyanoprokaryotes belong?

Answer 14

They belong to the class Myxophyceae, also known as Cyanophyceae.

Question 15

What are cyanoprokaryotes?

Answer 15

Cyanoprokaryotes are a primitive group of algae, also known as blue-green algae, comprising about 150 genera and approximately 2,500 species.

Question 16

How many species of cyanoprokaryotes are found in India?

Answer 16

India has 98 genera and about 833 species of cyanoprokaryotes.

Question 17

What is the main pigment in cyanoprokaryotes, and what color does it impart?

Answer 17

A: The main pigment is c-phycocyanin, which imparts a blue-green color to cyanoprokaryotes

Question 18

How are cyanoprokaryotes similar to bacteria?

Answer 18

A: Cyanoprokaryotes have a prokaryotic cell structure, lacking a defined nucleus and membrane-bound organelles, which is a trait shared with bacteria.

Question 19

Why it is prokaryote ??

Answer 19

a. Nucleus is of prokaryotic nature i.e., devoid of nuclear membrane and nucleolus.

b. Absence of well-organised cell organelles.

c. Pigments are distributed throughout the chromoplasm (the outer part of protoplasm).

Depending on the above prokaryotic characteristics many microbiologists consider the members of Cyanophyceae as bacteria. Based on prokaryotic cell structure like bacteria, Christensen (1962) placed both Cyanophyta and bacteria under a common phylum Prokaryota.

Question 20

Are membrane-bound chromatophores present in Cyanophyceae?

Answer 20

No, membrane-bound chromatophores are absent. Pigments are embedded in thylakoids.

Question 21

Where are pigments found in Cyanophyceae?

Answer 21

Pigments are embedded in thylakoids, not in membrane-bound chromatophores.

Question 22

What are the main reserve foods in Cyanophyceae?

Answer 22

The main reserve foods are cyanophycean starch and cyanophycean granules, which are protein-based.

Question 23

What is cyanophycean starch?

Answer 23

It is a type of storage carbohydrate found in Cyanophyceae.

Question 24

What are heterocysts, and what is their function in Cyanophyceae?

Answer 24

Heterocysts are specialized cells in some filamentous members of Cyanophyceae, thought to play a role in nitrogen fixation.

Question 25

In which cyanophyceae members are heterocysts commonly found?

Answer 25

Heterocysts are typically found in many filamentous members of Cyanophyceae.

Question 26

What are heterocysts, and what is their function in Cyanophyceae?

Answer 26

Heterocysts are specialized cells in some filamentous members of Cyanophyceae, thought to play a role in nitrogen fixation.

Question 27

What are cyanophycean granules?

Answer 27

Cyanophycean granules are protein-based reserve food structures in Cyanophyceae.

Question 28

What is asexual reproduction in Cyanophyceae, and what forms does it take?

Answer 28

Asexual reproduction includes the formation of endospores, exospores, akinetes, and nannospores.

Question 29

What methods are used in vegetative reproduction in Cyanophyceae?

Answer 29

Vegetative reproduction occurs through cell division, fragmentation, and similar processes.

Question 30

What types of reproduction are found in Cyanophyceae?

Answer 30

Cyanophyceae reproduce through vegetative and asexual methods.

Question 31

In which cyanophyceae members are heterocysts commonly found?

Answer 31

Heterocysts are typically found in many filamentous members of Cyanophyceae.

Question 32

In which cyanophyceae members are heterocysts commonly found?

Answer 32

Heterocysts are typically found in many filamentous members of Cyanophyceae.

Question 33

What are heterocysts, and what is their function in Cyanophyceae?

Answer 33

Heterocysts are specialized cells in some filamentous members of Cyanophyceae, thought to play a role in nitrogen fixation.