Heterocyst :

Which of the following statements are true about heterocyst? 1. They are formed in blue - green algae. 2. Heterocysts are nitrogen - fixing cells. 3. Heterocyts are formed during nitrogen starvation . 4. Anabaena and Nostoc are examples of heterocyst forming bacteria.

Which of the following statements are true about heterocyst? 1. They are formed in blue - green algae. 2. Heterocysts are nitrogen - fixing cells. 3. Heterocyts are formed during nitrogen starvation . 4. Anabaena and Nostoc are examples of heterocyst forming bacteria.

Match the items of column-I with column-II and select correct option. {:("Column-I","Column-II"),("a. Mesosome","(i) Lederberg"),("b. Plasmid","(ii) Helps in nitrogen fixation"),("c. Chromatophores","(iii) Photosynthetic structure in some prokaryotes"),("d. Heterocyst","(iv) Cell wall formation"):}