Name the dinoflagellate that causes red tide of the sea.

Select the features which are suitable for the following group of organisms. a)The walls are embedded with silica, most of them are photosynthetic. b) the cell wall has stiff cellulose plate on the outer surface, flagellate, causes red tide. c)Unicellular, pellicle is present, in the. absence light behaves as heterotrophs. d)Saprophytic, the spores posses true wall.

The "fire" algae responsible for red tides are the a. red dinoflagellates b. blue diatoms c. red diatoms d. blue dinoflgellates

.Name two compounds that can cause depletion of the ozone layer in the upper atmosphere

In human beings, certain diseases are caused due to genetic disorders. Name the method that allows the correction of a gene defect that has been diagnosed in a child or embryo.