Assertion. Hybrid seeds must be produced every year to obtain maximum advantage of heterosis.
Reason. Heterosis is lost by inbreeding

Give reasons Hybrid seeds should be raised every year.

Give reason: Hybrid seeds have to be produced year after year.

Heterosis lost due to inbreeding is known as

Give reasons why hybrid seeds are to be produced year after year.

Assertion: Hybridisation is involved in the production of hybrid vigour or heterosis. Reason: Hybrid is obtained by crossing the selected inbreed lines.

Hybrid seeds need to be essentially produced year after year. Why?

Asseration :Hybrid is superior than either of its parents. Reasons : vigour is lost upon inbreeding.