CBSE Class 8 Answered

Aim: To separate healthy seeds from damaged (unhealthy seeds)

Materials: Seeds to be tested (mixture of healthy and damaged seeds), water, beaker

Procedure/Observation: Take some water in a beaker and add seeds to be tested to it. When seeds are poured in water, they begin to float. After few hours, mature viable seeds absorb water and sink to the bottom of the beaker. Empty, immature or damaged seeds and other light material remain floating and can be skimmed off after an appropriate period of time. In this way, healthy mature and viable seeds can be separated from damaged, immature and non-viable seeds.