Read this article in Hindi to learn about the structure of spirogyra, explained with the help of a suitable diagram. पहचान एवं वर्गीकरण: यह अलवणीय जल के जलाशयों में पाया जाने वाला तन्तुरूपी हरा शैवाल है । इसकी आयताकार कोशिका में कुंडलित रिबन जैसा क्लोरोप्लॉस्ट इसकी खास पहचान है । वर्गीकरण में इसका स्थान निम्नानुसार है: जगत् - पादप-जगत् (यूकैरियोटिक [...]
A famous botanist F.E. Fritsch (1935) classified algae into following 11 classes, based on pigmentation, reserve food material, flagellation and reproduction. Class 1. Chlorophyceae (= Isokontae): Generally algae are fresh water and chlorophyllous thallophytes. Chlorophyll b and carotenoides are present in chloroplasts. The cell wall is made up of cellulose and food is synthesized in the form of starch. Motile [...]
In this article we will discuss about the phylogeny and interrelationship of cyanophyta. There is no positive evidence to indicate the phylogenetic origin of the division Cyanophyta. There are, however, certain intriguing characters which quite often give plenty of scope for speculation. The complete absence of flagellate stages might lead one to assume the origin of the Cyanophyta from unicellular [...]