Suggest an experiment to show how roots grow away from light in most plants.
A. Aim : To prove that roots grow away from light.
Apparatus: Glass jar, soil, seed.
i) Take a glass jar and fill it with soil. Sow a seed near the wall of the jar.
ii) This helps you to observe how root and shoot are
growing. After 4-5 days you will notice seed germina¬tion. •
iii) Keep the jar under the sun. Observe how root and shoot grows. Shoot will grow towards sun, root will grow away from sun.
iv) Then tilt the glass jar keep the plant horizontally.
v) Observe the direction of root and shoot for more than a week. Horizontal shoot grows towards sun and root towards land (away from) suh as shown in below diagram.
Observation : Root system grows away from the light.
Conclusion : It is proved that root system grows away from the light.