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.