What are the characteristics, which are expected to be available in the seeds of improved varieties?

The characteristics of improved varieties of seeds are as follows:
(i) The seeds should be photo and thermosensitive. Insensitivity affects the cultivation of the crops.
(ii) High yielding property.
(iii) Capacity to grow in almost all seasons.
(iv) Resistant to pests and diseases.
(v) Mature in a shorter period.