Biology for Competative Exams

Respiratory System

Respiratory System Cellular respiration requires oxygen and produces carbon dioxide. Oxygen must be dissolved in water before animals can take it up. Therefore, the lung...

Plant Growth Hormones

Plant Growth Hormones Generally, there are five types of plant hormones, namely auxins, gibberellins (GAs), cytokinins, abscisic acid (ABA) and ethylene.Auxins, gibberellins, cytokinins are plant...

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