Millions of chickens were killed in West Bengal, Odisha and Maharashtra recently . What was the reason?

A mixture of fragmented DNA was electrophoresed in an agarose gel. After staning the gel with ethidum bromide, no DNA bands were observed. What could be the reason?

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?