Observation of tomato plant
Answers
Answer:
The results of pre‐drying seeds prior to heating at high temperatures and a description of abnormalities in tomato seedlings caused by heat are given.
2
Commercial tomato seeds withstood 90° C. and 88–100° C. for 1 hour better when previously dried at lower temperatures, their germination being, however, markedly retarded.
3
Part of the heated seeds germinated abnormally, and the developing plants were more or less abnormal. The primary root did not develop, the cotyledons were misshapen, and the plumule failed to develop into a normal shoot.
4
The longer the period of pre‐drying, the higher the rate of germination, and the less the degree of abnormality.
5
The basal growing point of a tomato embryo is least resistant to heat, the apical growing point, the hypocotyl, the inner and, lastly, the outer cotyledons following in order of resistance.
6
Embryos unable to push through the seed‐coats can grow for a certain period within them and develop chlorophyll.