NCERT Solutions for Class 10th Science
Chapter 7. Control and Coordination
- Control and coordination are the functions of the nervous system and hormones in our bodies.
- Writing, talking, moving a chair, clapping at the end of a programme are examples of voluntary actions
- The brain has three such major parts or regions, namely the fore-brain, mid-brain and hind-brain.
- The fore-brain is the main thinking part of the brain. It has regions
which receive sensory impulses from various receptors.
- Many of these involuntary actions are controlled by the mid-brain and hind-brain. All these involuntary actions including blood pressure, salivation and vomiting are controlled by the medulla in the hind-brain.
- When growing plants detect light, a hormone called auxin.
- Gibberellins is plant hormones which help in the growth of the stem.
- Cytokinins is plant hormones which promote cell division.
- Abscisic acid is plant hormones which inhibits growth. Its effects include wilting of leaves.
- Chemical coordination is seen in both plants and animals.