'Heterocysts' the specialised thick- walled cells ,are found in a) the lichen b) the filamentous members of green algae c) the members of fungi imperfecti d) the members of green algae during adverse condition of moisture
Answers
Explanation:
Heterocyst is transparent thick walled empty cell which is present in intermittent position in filaments of blue green algae. They are the site of nitrogen fixation and hence carry the enzymatic machinery for the same. Blue green algae are prokaryotic photosynthetic Eubacteria. Riccia (bryophyte), Ulothrix (Algae), Albugo (Eumycota) are eukaryotes and none of them have ability to fix nitrogen. Nostoc is blue green algae which have characteristic peptidoglycan cell wall and heterocyst. Thus, the correct answer is option D.
Answer:
cyanobacteria
heterocyst A specialized cell found in nitrogen-fixing cyanobacteria. Heterocysts are enlarged cells with thick cell walls and they lack chlorophyll, giving them a colourless appearance. They are the site of nitrogen fixation, for which they produce the enzyme nitrogenase