The multicellular animals (except sponges) have specialised cells called nerve cells (or neurons) to respond to stimuli and coordinate their activities. A system made up of nerve cells is called nervous system. The coordination in simple multicellular animals takes place through nervous system only. For example, Hydra is a simple multicellular animal. The nervous system of Hydra consists of a network of nerve cells joined to one another and spread throughout its body.1. State true or false. A system made up of nerve cells is called nervous system.(i) TRUE(ii) FALSE2. State true or false. The control and coordination in higher animals called endocrine.(i) TRUE(ii) FALSE3. Vertebrates takes place through nervous system as well as hormonal system called ________ system.(i) Nervous(ii) Endocrine4. State true or false. A receptor is a cell (or a group of cells) in a sense organ which is sensitive to a particular type of stimulus (or a particular type of change in the environment) such as light, sound, smell, taste, heat, pressure, etc.(i) TRUE(ii) FALSE5. State true or false. Photoreceptors detect light (they are present in eyes).(i) TRUE(ii) FALSE