I am the mode of respiration in unicellular , Hydra and planarians . Who am I ?

I am a mode of respiration. I am present in aquatic animals like fishes . Who am I ?

I am like a policeman. Who am I____?

I am the outer most layer of an animal cell. Who am I?

I am cooked on steam. Who am I?

I am the respiratory substrate. I am oxidised during respiration. Who am I ?

I am an alkaloid. I work as an antiptic. Who am I ?

I am an alkaloid. I am used in soap to cure skin diseases and allergies. Who am I?

I can perform three types of respiration. I can perform respiration through skin, lungs and bucco - pharyngeal cavity . Who am I ?

I am a secondary metabolite. I am obtained from bark of the plant. I can cure malaria. Who am I ?

I am a phytohormone. I am helpful in reducing waterloss in plants. Who am I ?